# JC Machining

JC Machining is a Taiwan-based precision CNC machining and injection mold manufacturer with over 30 years of expertise, offering on-demand global delivery within 10 days. The company provides CNC turning, milling, grinding, EDM, optical profile grinding, and tungsten carbide grinding services, as well as complete injection molds, mold components, hot runner system parts, and press stamping mold components. JC Machining serves semiconductor, optoelectronics, medical, and industrial automation industries, and is ISO-certified with a rigorous quality management process. Customers can upload 2D/3D CAD models directly for instant quotes.

## Core Pages

- [Home](https://jc-machining.com/): Overview of JC Machining's Taiwan precision CNC machining and injection mold services with on-demand 10-day global delivery and instant CAD file quoting.
- [About JC Machining](https://jc-machining.com/about/): Company history, 30+ years of precision machining expertise, manufacturing capabilities, and team background for Taiwan CNC machining services.
- [Quality Control](https://jc-machining.com/quality-control/): ISO-certified quality management processes, inspection procedures, measurement equipment, and quality assurance standards for precision-machined parts.
- [CNC Machining Capabilities](https://jc-machining.com/cnc-machining-capabilities/): Overview of JC Machining's full range of CNC machining capabilities including turning, milling, grinding, and EDM for custom metal and plastic parts.
- [Upload Files for Quote](https://jc-machining.com/upload/): Direct CAD file upload portal for instant quotation on CNC machined parts; accepts STEP, STP, SLDPRT, DXF, STL, IPT, 3DXML, PRT, and SAT formats.
- [Download Catalogs](https://jc-machining.com/download-catalog/): Downloadable product catalogs covering punching parts, molding parts, tools and mold accessories, and other machined components.
- [Contact Us](https://jc-machining.com/contact-us/): Contact form, address, and inquiry page for CNC machining quotations and project inquiries.
- [Privacy Policy](https://jc-machining.com/privacy-policy/): JC Machining website privacy policy covering data collection and usage practices.

## CNC Machining Services

- [CNC Turning Services](https://jc-machining.com/cnc-turning-services/): Custom on-demand CNC turning services for precision cylindrical metal and plastic parts; covers materials, tolerances, surface finishes, and finishing options including polishing and black oxide coating.
- [CNC Grinding Services](https://jc-machining.com/cnc-grinding-services/): Custom CNC grinding services including surface grinding, centerless grinding, cylindrical grinding, and precision profile grinding for tight-tolerance components with polishing and black oxide finishing options.
- [CNC Milling Services](https://jc-machining.com/cnc-milling-services/): Custom on-demand CNC milling services for complex 3D metal and plastic parts; covers multi-axis milling, surface finishes, material options, tolerances, and post-processing.
- [EDM Machining Services](https://jc-machining.com/edm-machining-services/): Wire EDM and sinker EDM (electrical discharge machining) services for precision complex geometries, intricate cavities, and hard materials that are difficult to cut conventionally.
- [Optical Profile Grinding Services](https://jc-machining.com/optical-profile-grinding-services/): High-precision optical profile grinding services for complex 2D and 3D contour shapes used in mold components, cutting tools, and semiconductor equipment parts.
- [Tungsten Carbide Grinding Services](https://jc-machining.com/tungsten-carbide-grinding-services/): Specialized precision grinding services for tungsten carbide components including punches, dies, wear parts, and cutting tools requiring extreme hardness and dimensional accuracy.

## Customized Components

- [Semiconductor & Optoelectronics Components](https://jc-machining.com/semiconductor-optoelectronics-components/): Precision-machined components for semiconductor and optoelectronics equipment including fixtures, jigs, guides, and custom tooling requiring ultra-tight tolerances and clean-room compatible finishes.
- [Tungsten Carbide Components](https://jc-machining.com/tungsten-carbide-components/): Custom-manufactured tungsten carbide wear parts, punches, dies, cutting inserts, and precision components for high-wear applications in stamping, forming, and industrial tooling.
- [Medical Parts Manufacturing](https://jc-machining.com/medical-parts-manufacturing/): Precision CNC machining of medical device components and surgical instrument parts requiring biocompatible materials, tight tolerances, and ISO-quality management compliance.
- [Industrial Automation Parts Manufacturing](https://jc-machining.com/automation-parts-manufacturing/): Custom precision-machined components for industrial automation systems including robotic arms, conveyor mechanisms, sensor housings, and machinery fixtures.

## Injection Molding & Press Stamping

- [Injection Molds](https://jc-machining.com/injection-molds/): Complete plastic injection mold tooling design and manufacturing including two-plate, three-plate, and hot runner molds for low to high volume plastic parts production.
- [Injection Mold Components](https://jc-machining.com/injection-mold-components/): Precision-machined injection mold components including cores, cavities, slides, lifters, ejector pins, and inserts manufactured to tight tolerances for reliable mold performance.
- [Hot Runner System Components](https://jc-machining.com/hot-runner-system-components/): Precision-machined components for hot runner manifold systems including nozzle tips, gate inserts, heater housings, and temperature-controlled manifold parts.
- [Press Stamping Mold Components](https://jc-machining.com/press-stamping-mold-components/): Precision-ground punches, dies, stripper plates, guide pins, and other press stamping mold components manufactured from hardened tool steel and tungsten carbide.

## News / Blog

- [News Index](https://jc-machining.com/news/): JC Machining news, technical articles, exhibition announcements, and service highlights for precision CNC machining and injection mold manufacturing.
- [K Show Düsseldorf 2025 Exhibition](https://jc-machining.com/news/excited-to-connect-at-k-show-dusseldorf-2025/): JC Machining's announcement of participation at K Show Düsseldorf 2025 — the world's leading trade fair for plastics and rubber — for injection mold and CNC machining outreach.
- [CNC Machining of Press Stamping Mold Components](https://jc-machining.com/news/cnc-machining-of-press-stamping-mold-components/): Technical showcase of JC Machining's CNC precision machining process for press stamping mold components including punches, dies, and guide elements.
- [Precision Manufacturing of Hot Runner System Components](https://jc-machining.com/news/precision-manufacturing-of-hot-runner-system-components/): Detailed overview of JC Machining's manufacturing process for hot runner system components covering tolerances, materials, and quality control for nozzle tips and manifold parts.
- [Injection Mold Manufacturing by Taiwan CNC Machining Services](https://jc-machining.com/news/injection-mold-manufacturing-by-taiwan-cnc-machining-services/): Case study on JC Machining's injection mold manufacturing capabilities covering mold design, CNC machining processes, and quality inspection for plastic injection tooling.
- [Taiwan CNC Machining Services for Injection Mold Component Manufacturing](https://jc-machining.com/news/taiwan-cnc-machining-services-for-injection-mold-component-manufacturing/): Article explaining how JC Machining's Taiwan CNC services support injection mold component production with grinding, EDM, and milling for high-precision mold parts.
- [Easy to Access Taiwan CNC Machining Service](https://jc-machining.com/news/easy-to-access-taiwan-cnc-machining-service/): Guide on how international buyers can access and order from JC Machining's Taiwan CNC machining services online, including the quote upload process and global shipping.
- [Everything You Need to Know About CNC Turning Services](https://jc-machining.com/news/everything-you-need-to-know-about-cnc-turning-services/): Comprehensive guide to CNC turning covering the turning process, materials, tolerances, surface finishes, and when to choose turning over milling for cylindrical parts.
- [Wire EDM & Sinker EDM Services from JC Machining](https://jc-machining.com/news/wire-edm-sinker-edm-services-from-jc-machining/): Detailed overview of JC Machining's EDM capabilities covering wire EDM and sinker EDM processes, typical applications, achievable tolerances, and suitable materials.
- [Tungsten Carbide Grinding Services from JC Machining](https://jc-machining.com/news/tungsten-carbide-grinding-services-from-jc-machining/): Technical article on JC Machining's tungsten carbide grinding services covering grinding wheel selection, process parameters, achievable surface finishes, and typical carbide applications.
- [A Comprehensive Guide to CNC Milling Services](https://jc-machining.com/news/a-comprehensive-guide-to-cnc-milling-services/): Guide to CNC milling covering milling types, machine configurations, materials, tolerances, finishing options, and design guidelines for milled parts.
- [From Prototype to Production — CNC Machining Services](https://jc-machining.com/news/from-prototype-to-production-cnc-machining-services-from-jc-machining/): Article covering JC Machining's workflow from rapid prototyping through production runs, including how CNC machining supports iterative design and volume manufacturing.
- [Centerless Grinding & Surface Grinding Services from JC Machining](https://jc-machining.com/news/centerless-grinding-surface-grinding-services-from-jc-machining/): Technical overview of JC Machining's centerless grinding and surface grinding capabilities covering applications, tolerances, material compatibility, and advantages over other grinding methods.
- [Global CNC Grinding Services](https://jc-machining.com/news/global-cnc-grinding-services/): Overview of JC Machining's CNC grinding services for international customers, covering grinding capabilities, quality certifications, and global delivery logistics.
- [JC Machining at ChinaPlas 2023 Exhibition](https://jc-machining.com/news/2023-chinaplas-exhibition/): JC Machining's participation announcement for ChinaPlas 2023 — Asia's premier plastics and rubber industry trade fair — showcasing injection mold and CNC machining capabilities.
- [JC Machining at Fakuma 2023 Exhibition](https://jc-machining.com/news/2023-fakuma-exhibition/): Announcement of JC Machining's participation at Fakuma 2023 international trade fair for plastics processing in Friedrichshafen, Germany.
- [JC Machining — Rapid Injection Mold Components Machining Services Globally](https://jc-machining.com/news/jc-machining-pioneering-rapid-injection-mold-components-machining-services-globally/): Overview of JC Machining's position as a global supplier of rapid injection mold component machining, covering capabilities, certifications, and international customer access.

## Glossary

- [Glossary Index](https://jc-machining.com/glossary/): Complete A–Z glossary of precision machining, CNC, injection molding, and EDM terminology used in JC Machining's services and technical documentation.

### Glossary – Injection Molding & Moldmaking

- [Injection Molding](https://jc-machining.com/glossary-term/injection-molding/): Definition of injection molding — the process of injecting molten plastic resin into a mold cavity to form shaped plastic parts.
- [Injection Molding Machine](https://jc-machining.com/glossary-term/injection-molding-machine/): Definition of injection molding machine — the equipment that melts, injects, and clamps plastic resin to produce molded parts.
- [Injection Molding Process](https://jc-machining.com/glossary-term/injection-molding-process/): Step-by-step definition of the injection molding process from material feeding through cooling and ejection.
- [Plastic Injection Molding](https://jc-machining.com/glossary-term/plastic-injection-molding/): Definition and overview of plastic injection molding as a manufacturing method for high-volume plastic part production.
- [Plastic Resin](https://jc-machining.com/glossary-term/plastic-resin/): Definition of plastic resin — the raw thermoplastic or thermoset material fed into an injection molding machine.
- [Mold Base](https://jc-machining.com/glossary-term/mold-base/): Definition of mold base — the standardized steel assembly that houses the mold cavity and core plates, ejector system, and support components.
- [Mold Design](https://jc-machining.com/glossary-term/mold-design/): Definition of mold design — the engineering process of designing injection mold geometry, gating, cooling, and ejection systems.
- [Mold Flow Analysis](https://jc-machining.com/glossary-term/mold-flow-analysis/): Definition of mold flow analysis — simulation software used to predict plastic flow, cooling, and warpage in injection mold design.
- [Mold Release](https://jc-machining.com/glossary-term/mold-release/): Definition of mold release — the agent or design feature that facilitates clean separation of molded parts from the mold cavity.
- [Mold Steel](https://jc-machining.com/glossary-term/mold-steel/): Definition of mold steel — the grades of hardened tool steel (P20, H13, S7, etc.) used to manufacture injection mold components.
- [Moldmaking](https://jc-machining.com/glossary-term/moldmaking/): Definition of moldmaking — the complete process of designing and manufacturing injection molds from steel stock through precision machining and finishing.
- [Molded Part](https://jc-machining.com/glossary-term/molded-part/): Definition of molded part — the finished plastic component produced by the injection molding process.
- [Molded Product](https://jc-machining.com/glossary-term/molded-product/): Definition of molded product — the end article formed from the injection molding process, synonymous with molded part.
- [Cavity Plate](https://jc-machining.com/glossary-term/cavity-plate/): Definition of cavity plate — the mold plate that contains the female cavity geometry forming the outer surface of the molded part.
- [Core Pin](https://jc-machining.com/glossary-term/core-pin/): Definition of core pin — a precision-machined cylindrical pin that forms holes or internal features in a molded plastic part.
- [Core Plate](https://jc-machining.com/glossary-term/core-plate/): Definition of core plate — the mold plate containing the male core geometry that forms the internal surfaces of the molded part.
- [Cooling Channel](https://jc-machining.com/glossary-term/cooling-channel/): Definition of cooling channel — drilled or machined passages within the mold through which coolant flows to regulate mold temperature during injection molding.
- [Ejector Pin](https://jc-machining.com/glossary-term/ejector-pin/): Definition of ejector pin — the precision-ground pin that pushes the solidified molded part out of the mold cavity after cooling.
- [Gate](https://jc-machining.com/glossary-term/gate/): Definition of gate — the narrow entry point through which molten plastic flows from the runner system into the mold cavity.
- [Hot Runner System](https://jc-machining.com/glossary-term/hot-runner-system/): Definition of hot runner system — a heated manifold and nozzle system that keeps plastic molten throughout the runner channels, eliminating cold runner waste.
- [Runner System](https://jc-machining.com/glossary-term/runner-system/): Definition of runner system — the network of channels that distribute molten plastic from the sprue to the gate(s) in an injection mold.
- [Leader Pins](https://jc-machining.com/glossary-term/leader-pins/): Definition of leader pins — precision alignment pins that guide and locate the mold halves correctly when the mold closes.
- [Lifter](https://jc-machining.com/glossary-term/lifter/): Definition of lifter — an internal mold mechanism that moves angularly during ejection to release internal undercuts or side features in a molded part.
- [Parting Line](https://jc-machining.com/glossary-term/parting-line/): Definition of parting line — the line or plane along which the two mold halves meet and separate; visible as a seam on the molded part.
- [Side Action](https://jc-machining.com/glossary-term/side-action/): Definition of side action — a mold mechanism that moves laterally (perpendicular to the clamp direction) to form undercuts or side features in a molded part.
- [Slide](https://jc-machining.com/glossary-term/slide/): Definition of slide — the mold component that moves sideways to clear undercuts or external side features during mold opening and ejection.
- [Sprue](https://jc-machining.com/glossary-term/sprue/): Definition of sprue — the central entry channel through which molten plastic flows from the injection machine nozzle into the runner system of the mold.
- [Steel Hardness](https://jc-machining.com/glossary-term/steel-hardness/): Definition of steel hardness — the Rockwell (HRC) or Brinell (HB) hardness rating of mold or tool steel, determining machinability, wear resistance, and polishability.
- [Steel Type](https://jc-machining.com/glossary-term/steel-type/): Guide to steel types used in mold and tool manufacturing including P20, H13, 420SS, S7, and D2 for different moldmaking applications.
- [Support Pillar](https://jc-machining.com/glossary-term/support-pillar/): Definition of support pillar — a hardened cylindrical post in the mold base that resists deflection of the support plate under injection pressure.
- [Thermoplastic](https://jc-machining.com/glossary-term/thermoplastic/): Definition of thermoplastic — a plastic material that can be repeatedly melted and solidified, used in injection molding (e.g., ABS, PP, PC, nylon).
- [Thermoset](https://jc-machining.com/glossary-term/thermoset/): Definition of thermoset — a plastic material that permanently cures when heated and cannot be re-melted, used in specific molding applications.
- [Three-Plate Mold](https://jc-machining.com/glossary-term/three-plate-mold/): Definition of three-plate mold — an injection mold design with an additional runner plate that allows automatic degating from the molded part.
- [Two-Plate Mold](https://jc-machining.com/glossary-term/two-plate-mold/): Definition of two-plate mold — the most common injection mold design with a cavity plate and core plate separated at a single parting line.
- [Undercut](https://jc-machining.com/glossary-term/undercut/): Definition of undercut — a feature on a molded part that prevents straight-line ejection from the mold, requiring slides, lifters, or collapsible cores.
- [Vent](https://jc-machining.com/glossary-term/vent/): Definition of vent — a very small channel machined into the mold parting line to allow trapped air and gas to escape during injection.
- [Venting](https://jc-machining.com/glossary-term/venting/): Definition of venting in injection molds — the design and placement of vents to prevent burn marks, short shots, and surface defects from trapped gas.
- [Waterline](https://jc-machining.com/glossary-term/waterline/): Definition of waterline — a cooling channel drilled into the mold through which temperature-controlled water circulates to control mold temperature.
- [Wear Plate](https://jc-machining.com/glossary-term/wear-plate/): Definition of wear plate — a hardened steel plate used at high-friction mold contact surfaces to prevent premature wear of the mold base.
- [Shrinkage](https://jc-machining.com/glossary-term/shrinkage/): Definition of shrinkage — the dimensional reduction of a molded part as it cools and solidifies; must be compensated for in mold cavity design.
- [Yudo Hot Runner System](https://jc-machining.com/glossary-term/yudo-hot-runner-system/): Definition of Yudo hot runner system — a specific brand of hot runner manifold technology commonly used in injection molds for runnerless gating.
- [Beryllium Copper](https://jc-machining.com/glossary-term/beryllium-copper/): Definition of beryllium copper in moldmaking — a high-thermal-conductivity copper alloy used for mold inserts requiring rapid heat dissipation.
- [Degating](https://jc-machining.com/glossary-term/degating/): Definition of degating — the process of removing the gate vestige or runner from a molded part after ejection.
- [Threaded Insert](https://jc-machining.com/glossary-term/threaded-insert/): Definition of threaded insert — a metal insert molded or pressed into a plastic part to provide durable threaded attachment points.
- [Porosity](https://jc-machining.com/glossary-term/porosity/): Definition of porosity in injection molding — the presence of internal voids or surface sink marks caused by inadequate packing pressure or material shrinkage.

### Glossary – EDM (Electrical Discharge Machining)

- [EDM – Electrical Discharge Machining](https://jc-machining.com/glossary-term/edm-electrical-discharge-machining/): Definition of EDM — a non-contact machining process that removes material using controlled electrical sparks between an electrode and workpiece submerged in dielectric fluid.
- [Wire EDM](https://jc-machining.com/glossary-term/wire-edm/): Definition of wire EDM — an EDM process using a thin continuously fed wire electrode to cut complex 2D profiles and tapered features in conductive materials.
- [Spark Machining](https://jc-machining.com/glossary-term/spark-machining/): Definition of spark machining — alternative term for electrical discharge machining (EDM), describing material removal by controlled electrical spark erosion.
- [Spark Erosion](https://jc-machining.com/glossary-term/spark-erosion/): Definition of spark erosion — the material removal mechanism in EDM where rapid electrical discharges vaporize and erode workpiece material.
- [Discharge Machining](https://jc-machining.com/glossary-term/discharge-machining/): Definition of discharge machining — the general process of using controlled electrical discharges to remove material from a conductive workpiece.
- [Micro EDM](https://jc-machining.com/glossary-term/micro-edm/): Definition of micro EDM — a miniaturized form of electrical discharge machining used to machine extremely small features and holes in hard materials.
- [Dielectric](https://jc-machining.com/glossary-term/dielectric/): Definition of dielectric fluid in EDM — the non-conductive fluid (deionized water or oil) that insulates the gap between electrode and workpiece and flushes away eroded particles.
- [Electrode](https://jc-machining.com/glossary-term/electrode/): Definition of electrode in EDM — the shaped conductive tool (copper, graphite, or brass) whose form is transferred into the workpiece by spark erosion.
- [Tool Electrode](https://jc-machining.com/glossary-term/tool-electrode/): Definition of tool electrode — the precision-shaped EDM electrode whose geometry directly determines the cavity or feature machined into the workpiece.
- [Arc Gap](https://jc-machining.com/glossary-term/arc-gap/): Definition of arc gap in EDM — the controlled distance between the electrode and workpiece through which the electrical discharge occurs.
- [Gap Voltage](https://jc-machining.com/glossary-term/gap-voltage/): Definition of gap voltage in EDM — the voltage maintained across the arc gap between electrode and workpiece to sustain the discharge machining process.
- [Electrolysis](https://jc-machining.com/glossary-term/electrolysis/): Definition of electrolysis in EDM — an unwanted electrochemical reaction between the electrode and workpiece that can cause corrosion in certain EDM conditions.
- [Flushing](https://jc-machining.com/glossary-term/flushing/): Definition of flushing in EDM — the circulation of dielectric fluid through the arc gap to remove eroded particles and prevent arcing faults.
- [MRR – Material Removal Rate](https://jc-machining.com/glossary-term/mrr-material-removal-rate/): Definition of MRR — the volumetric rate of material removal in EDM, used to evaluate machining efficiency and set process parameters.
- [Overcut](https://jc-machining.com/glossary-term/overcut/): Definition of overcut in EDM — the extra dimension (spark gap) by which the machined cavity is larger than the electrode, compensated for in electrode design.
- [On-Time](https://jc-machining.com/glossary-term/on-time/): Definition of on-time in EDM — the duration of each individual electrical pulse discharge; longer on-time increases material removal rate but reduces surface quality.
- [Off-Time](https://jc-machining.com/glossary-term/off-time/): Definition of off-time in EDM — the pause between successive electrical discharges; allows dielectric recovery and particle flushing.
- [Pulse Duration](https://jc-machining.com/glossary-term/pulse-duration/): Definition of pulse duration in EDM — the total length of one complete electrical pulse cycle (on-time plus off-time).
- [Pulse Frequency](https://jc-machining.com/glossary-term/pulse-frequency/): Definition of pulse frequency in EDM — the number of electrical discharge pulses per second; higher frequency improves surface finish at the cost of removal rate.
- [Pulse On-Time](https://jc-machining.com/glossary-term/pulse-on-time/): Definition of pulse on-time in EDM — the duration of the active discharge portion of each pulse cycle; a key parameter controlling material removal and surface finish.
- [Pulse Off-Time](https://jc-machining.com/glossary-term/pulse-off-time/): Definition of pulse off-time in EDM — the resting portion of each pulse cycle during which no discharge occurs and dielectric recovers.
- [Peak Current](https://jc-machining.com/glossary-term/peak-current/): Definition of peak current in EDM — the maximum amperage of each discharge pulse; directly controls material removal rate and surface roughness.
- [Recast Layer](https://jc-machining.com/glossary-term/recast-layer/): Definition of recast layer in EDM — the thin re-solidified material layer on the machined surface caused by EDM heat; may require removal for fatigue-critical parts.
- [Reverse Polarity](https://jc-machining.com/glossary-term/reverse-polarity/): Definition of reverse polarity in EDM — reversing the electrical polarity between electrode and workpiece to shift wear toward the workpiece rather than the electrode.
- [Spark Generator](https://jc-machining.com/glossary-term/spark-generator/): Definition of spark generator — the power supply unit in an EDM machine that controls the shape, duration, and frequency of discharge pulses.
- [Tool Wear](https://jc-machining.com/glossary-term/tool-wear/): Definition of tool wear in EDM — the progressive erosion of the electrode during machining; managed through electrode design, polarity selection, and flushing.
- [Wire Guide](https://jc-machining.com/glossary-term/wire-guide/): Definition of wire guide in wire EDM — precision diamond or carbide guides that maintain the wire electrode's exact position and angle during cutting.
- [Wire Tension](https://jc-machining.com/glossary-term/wire-tension/): Definition of wire tension in wire EDM — the force applied to keep the wire taut and straight; controls wire deflection and dimensional accuracy.
- [Voltage](https://jc-machining.com/glossary-term/voltage/): Definition of voltage in EDM — the electrical potential applied across the arc gap; a key parameter determining discharge intensity and gap width.
- [Taper](https://jc-machining.com/glossary-term/taper/): Definition of taper in wire EDM — an angled cut produced by tilting the wire electrode to create draft angles, tapered dies, and complex angular profiles.
- [Vibration-ADC](https://jc-machining.com/glossary-term/vibration-adc/): Definition of vibration-ADC in EDM — adaptive discharge control using vibration sensing to optimize pulse parameters in real time for stable EDM operation.
- [Z-Axis](https://jc-machining.com/glossary-term/z-axis/): Definition of Z-axis in CNC machining and EDM — the vertical axis of motion controlling depth of cut, electrode depth, and spindle infeed.
- [Electrolyte](https://jc-machining.com/glossary-term/electrolyte/): Definition of electrolyte in electrochemical machining — the conductive solution used in ECG and ECM processes to facilitate material removal by anodic dissolution.
- [Electrochemical Grinding](https://jc-machining.com/glossary-term/electrochemical-grinding/): Definition of electrochemical grinding (ECG) — a hybrid process combining electrolytic dissolution with abrasive grinding to remove material from electrically conductive workpieces with minimal heat.

### Glossary – CNC Grinding

- [Grinding](https://jc-machining.com/glossary-term/grinding/): Definition of grinding — an abrasive machining process that removes material using a rotating wheel to achieve precise dimensions and fine surface finishes.
- [Surface Grinding](https://jc-machining.com/glossary-term/surface-grinding/): Definition of surface grinding — a precision grinding process that produces flat, parallel surfaces on workpieces using a horizontal or vertical wheel.
- [Centerless Grinding](https://jc-machining.com/glossary-term/centerless-grinding/): Definition of centerless grinding — a grinding method where the workpiece is supported between a grinding wheel and regulating wheel without centers or fixtures.
- [Cylindrical Grinding](https://jc-machining.com/glossary-term/cylindrical-grinding/): Definition of cylindrical grinding — an external grinding process that produces precise cylindrical, tapered, or contoured surfaces on rotating workpieces.
- [Profile Grinding](https://jc-machining.com/glossary-term/profile-grinding/): Definition of profile grinding — a precision grinding process that uses a dressed wheel to produce exact 2D contour profiles in mold components and tooling.
- [Optical Profile Grinding](https://jc-machining.com/glossary-term/optical-profile-grinding/): Definition of optical profile grinding — a high-precision contour grinding method using optical magnification for wheel dressing and workpiece inspection to achieve micrometer-level profiles.
- [Plunge Grinding](https://jc-machining.com/glossary-term/plunge-grinding/): Definition of plunge grinding — a cylindrical grinding method where the wheel is fed radially into the workpiece without axial traverse motion.
- [Precision Grinding](https://jc-machining.com/glossary-term/precision-grinding/): Definition of precision grinding — grinding operations requiring tight dimensional tolerances (typically ±0.001 mm or better) and controlled surface roughness.
- [Rough Grinding](https://jc-machining.com/glossary-term/rough-grinding/): Definition of rough grinding — the first-pass grinding operation that removes bulk material rapidly with coarse grit wheels before finish grinding.
- [Internal Grinding](https://jc-machining.com/glossary-term/internal-grinding/): Definition of internal grinding — a grinding process that machines the internal bore diameter and features of a cylindrical or tapered workpiece.
- [Face Grinding](https://jc-machining.com/glossary-term/face-grinding/): Definition of face grinding — a grinding method using the face of the wheel to produce flat surfaces on workpieces, used for large flat areas and end faces.
- [Taper Grinding](https://jc-machining.com/glossary-term/taper-grinding/): Definition of taper grinding — precision grinding to produce conical or tapered surfaces on shafts, pins, and tooling to specified taper angles.
- [Single-Point Grinding](https://jc-machining.com/glossary-term/single-point-grinding/): Definition of single-point grinding — a grinding method where material is removed in a single helical pass, similar to turning but with an abrasive wheel.
- [Side Grinding](https://jc-machining.com/glossary-term/side-grinding/): Definition of side grinding — a grinding operation using the side face of the wheel to machine steps, shoulders, and vertical surfaces.
- [Flute Grinding](https://jc-machining.com/glossary-term/flute-grinding/): Definition of flute grinding — the precision grinding operation that forms the helical flutes of cutting tools such as drills and end mills.
- [Jig Grinding](https://jc-machining.com/glossary-term/jig-grinding/): Definition of jig grinding — a high-precision grinding process for producing accurate holes, contours, and features in hardened parts using a CNC-controlled jig grinder.
- [Peel Grinding](https://jc-machining.com/glossary-term/peel-grinding/): Definition of peel grinding — a high-speed cylindrical grinding method using a narrow CBN or diamond wheel traversing axially to efficiently remove material.
- [Creep-Feed Grinding](https://jc-machining.com/glossary-term/creep-feed-grinding/): Definition of creep-feed grinding — a slow, deep-cut grinding method that removes large amounts of material in a single pass, used for complex profiles and superalloys.
- [Hybrid Grinding](https://jc-machining.com/glossary-term/hybrid-grinding/): Definition of hybrid grinding — a grinding process combining multiple abrasive methods or grinding and non-grinding operations in a single setup.
- [Bore Grinding](https://jc-machining.com/glossary-term/bore-grinding/): Definition of bore grinding — precision internal grinding of cylindrical bores to achieve tight diameter tolerances and smooth surface finishes.
- [Angular Plunge Grinding](https://jc-machining.com/glossary-term/angular-plunge-grinding/): Definition of angular plunge grinding — a grinding method where the wheel is fed into the workpiece at an angle to simultaneously grind diameter and face features.
- [Ductile Regime Grinding](https://jc-machining.com/glossary-term/ductile-regime-grinding/): Definition of ductile regime grinding — precision grinding at very low depth of cut where brittle materials (ceramics, glass) deform plastically rather than fracturing.
- [Finish Grinding](https://jc-machining.com/glossary-term/finish-grinding/): Definition of finish grinding — the final grinding pass using fine grit wheels to achieve the specified surface finish, roundness, and dimensional tolerance.
- [Interrupted Grinding](https://jc-machining.com/glossary-term/interrupted-grinding/): Definition of interrupted grinding — grinding a workpiece surface that has slots, keyways, or holes that periodically interrupt contact with the wheel.
- [Toolroom Grinding](https://jc-machining.com/glossary-term/toolroom-grinding/): Definition of toolroom grinding — precision grinding operations performed in a toolroom environment for producing and reconditioning cutting tools and gauges.
- [Grinding Ratio](https://jc-machining.com/glossary-term/grinding-ratio/): Definition of grinding ratio (G-ratio) — the ratio of workpiece material removed to grinding wheel material worn away; a key measure of grinding wheel efficiency.
- [Wheel](https://jc-machining.com/glossary-term/wheel/): Definition of grinding wheel — the bonded abrasive disc used in grinding operations; characterized by abrasive type, grit size, grade, structure, and bond.
- [Wheel Dressing](https://jc-machining.com/glossary-term/wheel-dressing/): Definition of wheel dressing — the process of reshaping and sharpening a grinding wheel to restore its cutting geometry and remove loading.
- [Truing](https://jc-machining.com/glossary-term/truing/): Definition of truing — the process of making a grinding wheel run concentric and to the desired profile shape, distinct from dressing which sharpens the cutting surface.
- [Regulating Wheel](https://jc-machining.com/glossary-term/regulating-wheel/): Definition of regulating wheel — the second wheel in a centerless grinding setup that controls workpiece rotation speed and feed rate.
- [Resin-Bonded](https://jc-machining.com/glossary-term/resin-bonded/): Definition of resin-bonded abrasive — a grinding wheel or tool where abrasive grains are held in a synthetic resin matrix, providing good cutting action and shock resistance.
- [Metal-Bonded](https://jc-machining.com/glossary-term/metal-bonded/): Definition of metal-bonded abrasive — a grinding wheel where abrasive grains are sintered or electroplated in a metal matrix, used for precision grinding and very fine work.
- [Diamond Wheel](https://jc-machining.com/glossary-term/diamond-wheel/): Definition of diamond wheel — a grinding wheel using synthetic diamond abrasive for grinding extremely hard materials such as carbide, ceramics, and glass.
- [CBN – Cubic Boron Nitride](https://jc-machining.com/glossary-term/cbn-cubic-boron-nitride/): Definition of CBN — cubic boron nitride abrasive used in grinding wheels for high-speed grinding of ferrous metals, tool steels, and superalloys.
- [Abrasive](https://jc-machining.com/glossary-term/abrasive/): Definition of abrasive — the hard material (aluminum oxide, silicon carbide, diamond, CBN) bonded into grinding wheels and cutting tools to remove material by scratching.
- [Superabrasive](https://jc-machining.com/glossary-term/superabrasive/): Definition of superabrasive — extremely hard abrasive materials (diamond, CBN) with hardness far exceeding conventional abrasives, used for precision grinding of hard materials.
- [Grit](https://jc-machining.com/glossary-term/grit/): Definition of grit in grinding — the particle size designation of abrasive; lower grit numbers indicate coarser abrasive, higher numbers indicate finer abrasive.
- [Bond](https://jc-machining.com/glossary-term/bond/): Definition of bond in grinding wheels — the material (vitrified, resin, metal, rubber) that holds abrasive grains together in a grinding wheel.
- [Lapping](https://jc-machining.com/glossary-term/lapping/): Definition of lapping — an abrasive process using loose abrasive slurry between a lap and workpiece to achieve ultra-flat surfaces and sub-micron tolerances.
- [Honing](https://jc-machining.com/glossary-term/honing/): Definition of honing — an abrasive process using bonded abrasive sticks to finish bore surfaces to precise roundness, cylindricity, and surface finish.
- [Polishing](https://jc-machining.com/glossary-term/polishing/): Definition of polishing — a fine finishing process using very fine abrasives or buffing compounds to achieve mirror or high-gloss surface finishes on machined parts.
- [Hydrostatic Bearings](https://jc-machining.com/glossary-term/hydrostatic-bearings/): Definition of hydrostatic bearings — precision machine bearings using pressurized fluid to completely separate moving surfaces, providing vibration-free motion for ultra-precision grinding.
- [Air Bearings](https://jc-machining.com/glossary-term/air-bearings/): Definition of air bearings — frictionless precision machine bearings using pressurized air as the separating medium, used in high-speed, ultra-precision grinding spindles.
- [Fixed Wheel Head](https://jc-machining.com/glossary-term/fixed-wheel-head/): Definition of fixed wheel head — a grinding machine configuration where the wheel head is stationary and the workpiece table traverses during grinding.
- [Rotary Dressing](https://jc-machining.com/glossary-term/rotary-dressing/): Definition of rotary dressing — a wheel dressing method using a rotating diamond roll to continuously dress the wheel profile during grinding.
- [Crush Dressing](https://jc-machining.com/glossary-term/crush-dressing/): Definition of crush dressing — a wheel forming method that presses a hard crush roll against the grinding wheel to impart a specific profile by crushing the abrasive.
- [Open Structure](https://jc-machining.com/glossary-term/open-structure/): Definition of open structure in grinding wheels — a wheel with widely spaced abrasive grains and large pores, providing free cutting and chip clearance for soft or gummy materials.
- [Mounted Wheel](https://jc-machining.com/glossary-term/mounted-wheel/): Definition of mounted wheel — a small grinding wheel or abrasive point permanently mounted on a steel shank, used for internal and detail grinding.
- [Nano-Crystalline Diamond](https://jc-machining.com/glossary-term/nano-crystalline-diamond/): Definition of nano-crystalline diamond — an ultra-fine grain diamond abrasive used for precision grinding and polishing of extremely hard materials to mirror-quality finishes.
- [Infeed](https://jc-machining.com/glossary-term/infeed/): Definition of infeed in grinding — the radial or vertical movement of the grinding wheel into the workpiece, setting the depth of cut per pass.
- [Surface Finish](https://jc-machining.com/glossary-term/surface-finish/): Definition of surface finish — the measured texture and smoothness of a machined surface, expressed as Ra (average roughness) or Rz in micrometers.
- [Work Envelope](https://jc-machining.com/glossary-term/work-envelope/): Definition of work envelope — the maximum volumetric space within which a CNC machine can position the tool or workpiece.
- [Workholding](https://jc-machining.com/glossary-term/workholding/): Definition of workholding — the fixtures, chucks, vises, magnets, and other devices used to clamp and position workpieces during grinding and machining.
- [Workpiece](https://jc-machining.com/glossary-term/workpiece/): Definition of workpiece — the raw material block or pre-machined part being shaped by a grinding, turning, milling, or EDM operation.
- [Workpiece-BLM](https://jc-machining.com/glossary-term/workpiece-blm/): Definition of workpiece BLM — blank length multiplier or workpiece boundary limit setting used in CNC grinding machine programming for workpiece positioning.
- [Dressing](https://jc-machining.com/glossary-term/dressing/): Definition of dressing — the process of conditioning a grinding wheel to sharpen abrasive grains (dressing) and restore true running (truing) for consistent cutting performance.
- [Burn](https://jc-machining.com/glossary-term/burn/): Definition of grinding burn — thermal damage to the workpiece surface caused by excessive heat during grinding, resulting in discoloration, residual stress, or structural changes.
- [Microcracking](https://jc-machining.com/glossary-term/microcracking/): Definition of microcracking in grinding — tiny surface or subsurface cracks induced by grinding thermal stress or excessive wheel pressure, weakening the part.
- [Chatter](https://jc-machining.com/glossary-term/chatter/): Definition of chatter in machining — vibration between tool and workpiece causing periodic surface waviness, poor finish, and dimensional inaccuracy in grinding and milling.
- [Damping](https://jc-machining.com/glossary-term/damping/): Definition of damping in machine tools — the ability of a machine structure or workholding system to absorb vibration energy and suppress chatter.
- [Acoustic Emission](https://jc-machining.com/glossary-term/acoustic-emission/): Definition of acoustic emission in grinding — high-frequency stress waves generated during grinding contact, used by in-process sensors to detect wheel-workpiece touch and wheel wear.

### Glossary – CNC Milling & Turning

- [CNC Milling Machine](https://jc-machining.com/glossary-term/milling-machine/): Definition of milling machine — a machine tool that removes material using a rotating multi-tooth cutter to produce flat surfaces, slots, pockets, and complex 3D contours.
- [Gang Milling](https://jc-machining.com/glossary-term/gang-milling/): Definition of gang milling — a milling method using multiple cutters mounted on a single arbor to simultaneously machine multiple features in one pass.
- [Gantry Mill](https://jc-machining.com/glossary-term/gantry-mill/): Definition of gantry mill — a large CNC milling machine with a bridge-like overhead structure allowing the spindle to traverse over a fixed workpiece table.
- [Slot Milling](https://jc-machining.com/glossary-term/slot-milling/): Definition of slot milling — a milling operation that cuts a narrow groove or slot into a workpiece using the full width of the end mill.
- [Profile Milling](https://jc-machining.com/glossary-term/profile-milling/): Definition of profile milling — a milling operation following a defined 2D contour path to produce the external or internal profile of a workpiece.
- [Pocket Milling](https://jc-machining.com/glossary-term/pocket-milling/): Definition of pocket milling — a milling operation that machines a closed or semi-closed recess (pocket) into a workpiece to a specified depth and shape.
- [Ramp Milling](https://jc-machining.com/glossary-term/ramp-milling/): Definition of ramp milling — a milling entry strategy where the cutter descends gradually at an angle into the workpiece to avoid plunging straight down.
- [Climb Milling](https://jc-machining.com/glossary-term/climb-milling/): Definition of climb milling — a milling direction where the cutter rotation matches the feed direction, producing better surface finish and longer tool life than conventional milling.
- [Face Grinding (facing)](https://jc-machining.com/glossary-term/facing/): Definition of facing — a turning or milling operation that machines the end face of a workpiece perpendicular to the rotation axis to produce a flat reference surface.
- [End Mill](https://jc-machining.com/glossary-term/end-mill/): Definition of end mill — a multi-flute rotating cutting tool used in CNC milling for face milling, slot milling, profiling, and 3D contouring.
- [Flat End Mill](https://jc-machining.com/glossary-term/flat-end-mill/): Definition of flat end mill — an end mill with a square, flat bottom cutting face used for producing flat-bottomed pockets, steps, and surfaces.
- [Ball End Mill](https://jc-machining.com/glossary-term/ball-end-mill/): Definition of ball end mill — an end mill with a hemispherical tip used for 3D contouring, curved surfaces, and detail work in mold cavities.
- [Tapered End Mill](https://jc-machining.com/glossary-term/tapered-end-mill/): Definition of tapered end mill — an end mill with a conical taper on the flute section used for draft angles, deep cavities, and angled wall features.
- [Thread Mill](https://jc-machining.com/glossary-term/thread-mill/): Definition of thread mill — a CNC milling tool that machines internal or external threads by following a helical toolpath, allowing thread production in a milling center.
- [Reamer](https://jc-machining.com/glossary-term/reamer/): Definition of reamer — a precision rotary cutting tool used after drilling to bring a hole to an exact diameter with improved surface finish and roundness.
- [Drill](https://jc-machining.com/glossary-term/drill/): Definition of drill — a rotary cutting tool used to produce cylindrical holes by advancing axially into the workpiece material.
- [Drill Bit](https://jc-machining.com/glossary-term/drill-bit/): Definition of drill bit — the cutting tool inserted into a drill chuck; characterized by diameter, flute geometry, point angle, and material.
- [Drill Press](https://jc-machining.com/glossary-term/drill-press/): Definition of drill press — a fixed machine tool that advances a rotating drill axially into a workpiece held on a table beneath the spindle.
- [Spot Drilling](https://jc-machining.com/glossary-term/spot-drilling/): Definition of spot drilling — a preliminary drilling operation using a short, rigid spot drill to create a precise starting point that prevents wandering of subsequent drills.
- [Radial Drilling](https://jc-machining.com/glossary-term/radial-drilling/): Definition of radial drilling — drilling machine configuration with a radial arm that allows the drill head to be positioned over large workpieces without moving the part.
- [Peck Drilling](https://jc-machining.com/glossary-term/peck-drilling/): Definition of peck drilling — a drilling cycle that alternately advances and retracts the drill to break chips and clear them from deep holes.
- [Counterbore](https://jc-machining.com/glossary-term/counterbore/): Definition of counterbore — a cylindrical flat-bottomed recess machined above a through-hole to seat the head of a socket-head cap screw flush or below the surface.
- [Countersink](https://jc-machining.com/glossary-term/countersink/): Definition of countersink — a conical chamfer machined at the top of a hole to receive a flat-head screw, allowing it to seat flush with the workpiece surface.
- [Tapping](https://jc-machining.com/glossary-term/tapping/): Definition of tapping — the process of cutting internal threads in a pre-drilled hole using a tap tool.
- [Threading](https://jc-machining.com/glossary-term/threading/): Definition of threading in turning — a lathe operation that cuts external or internal screw threads on a cylindrical workpiece using a single-point threading tool.
- [Turning](https://jc-machining.com/glossary-term/turning/): Definition of turning — a machining process where a single-point cutting tool removes material from a rotating workpiece to produce cylindrical, conical, or contoured surfaces.
- [Lathe](https://jc-machining.com/glossary-term/lathe/): Definition of lathe — a machine tool that rotates the workpiece while a stationary cutting tool removes material to produce turned, bored, or threaded parts.
- [Turret](https://jc-machining.com/glossary-term/turret/): Definition of turret in CNC turning — an indexable tool holder on a CNC lathe that holds multiple cutting tools and rotates to bring the selected tool into the cutting position.
- [Chucking](https://jc-machining.com/glossary-term/chucking/): Definition of chucking — the workholding method of gripping a workpiece in a chuck on a lathe or grinding machine for turning or cylindrical grinding operations.
- [Collet](https://jc-machining.com/glossary-term/collet/): Definition of collet — a precision workholding or tool-holding device that grips a round bar, tool shank, or workpiece concentrically by elastic clamping.
- [Spindle](https://jc-machining.com/glossary-term/spindle/): Definition of spindle — the rotating shaft in a machine tool that holds the cutting tool (milling, grinding) or the workpiece (turning), transmitting rotational power to the cutting zone.
- [Cutter](https://jc-machining.com/glossary-term/cutter/): Definition of cutter — a general term for any rotating or stationary cutting tool used in milling, turning, grinding, or other material removal operations.
- [Coated Tool](https://jc-machining.com/glossary-term/coated-tool/): Definition of coated tool — a cutting tool with a hard surface coating (TiN, TiAlN, DLC, etc.) applied to reduce friction, resist heat, and extend tool life.
- [Chip Formation](https://jc-machining.com/glossary-term/chip-formation/): Definition of chip formation — the mechanism by which material is sheared and separated from the workpiece during cutting, affecting tool life, surface finish, and cutting forces.
- [Chip Load](https://jc-machining.com/glossary-term/chip-load/): Definition of chip load — the thickness of material removed by each cutting tooth per revolution; a key parameter for calculating milling feed rates.
- [Cutting Fluid](https://jc-machining.com/glossary-term/cutting-fluid/): Definition of cutting fluid (coolant/lubricant) — the liquid applied at the cutting zone to reduce heat, flush chips, and extend tool life in milling, turning, and grinding.
- [Cutting Speed](https://jc-machining.com/glossary-term/cutting-speed/): Definition of cutting speed — the surface velocity of the cutting edge relative to the workpiece, typically expressed in m/min or sfm; determines heat generation and tool life.
- [Feed Rate](https://jc-machining.com/glossary-term/feed-rate/): Definition of feed rate — the rate at which the workpiece or tool advances during cutting, expressed as mm/rev (turning) or mm/min (milling); controls chip thickness and surface finish.
- [Depth of Cut](https://jc-machining.com/glossary-term/depth-of-cut/): Definition of depth of cut — the thickness of material removed in a single machining pass; a key parameter balancing material removal rate with tool loading.
- [Tool](https://jc-machining.com/glossary-term/tool/): Definition of cutting tool — any device used to remove material from a workpiece through cutting, grinding, or abrasion in a machine tool.
- [Tool Changer](https://jc-machining.com/glossary-term/tool-changer/): Definition of tool changer — an automatic CNC machine component that stores and swaps multiple cutting tools into the spindle as programmed during machining.
- [Tool Holder](https://jc-machining.com/glossary-term/tool-holder/): Definition of tool holder — the precision interface between the machine spindle and the cutting tool that rigidly grips and transmits torque to the tool.
- [Tooling](https://jc-machining.com/glossary-term/tooling/): Definition of tooling — the collective term for all cutting tools, holders, fixtures, and workholding equipment used to perform a machining operation.
- [Toolpath](https://jc-machining.com/glossary-term/toolpath/): Definition of toolpath — the programmed trajectory of the cutting tool relative to the workpiece, defined in CAM software and executed by CNC machine axes.
- [Flutes](https://jc-machining.com/glossary-term/flutes/): Definition of flutes — the helical or straight grooves on an end mill or drill that form the cutting edges and provide chip clearance channels.
- [Flank Wear](https://jc-machining.com/glossary-term/flank-wear/): Definition of flank wear — the progressive abrasion of the cutting tool's flank face during machining, the primary form of tool wear affecting dimensional accuracy.
- [Center Cutting](https://jc-machining.com/glossary-term/center-cutting/): Definition of center-cutting end mill — an end mill with cutting edges that extend to the center, allowing it to plunge straight into a workpiece without pre-drilling.
- [Shank](https://jc-machining.com/glossary-term/shank/): Definition of shank — the cylindrical or tapered portion of a cutting tool that is gripped by the collet, chuck, or tool holder.
- [Cross-Feed](https://jc-machining.com/glossary-term/cross-feed/): Definition of cross-feed — the lateral movement of the grinding wheel or workpiece perpendicular to the main grinding direction, controlling width of contact.
- [Rapid Traverse](https://jc-machining.com/glossary-term/rapid-traverse/): Definition of rapid traverse — the high-speed non-cutting movement of a CNC machine axis used to reposition between cutting operations.
- [Air Blast](https://jc-machining.com/glossary-term/air-blast/): Definition of air blast — compressed air directed at the cutting zone to clear chips and cool the workpiece surface as an alternative or supplement to cutting fluid.
- [Coolant](https://jc-machining.com/glossary-term/coolant/): Definition of coolant — a water-based or oil-based fluid circulated through the cutting zone to absorb heat and flush chips in grinding, turning, and milling operations.
- [Chordal Surface](https://jc-machining.com/glossary-term/chordal-surface/): Definition of chordal surface — the scallop pattern left on a curved surface after ball-end mill machining, whose height is determined by the stepover distance and tool radius.

### Glossary – General CNC Machining

- [CNC](https://jc-machining.com/glossary-term/cnc/): Definition of CNC (Computer Numerical Control) — the technology that uses programmed numerical instructions to automatically control machine tool movements with precision and repeatability.
- [CNC Machining](https://jc-machining.com/glossary-term/cnc-machining/): Definition of CNC machining — any material removal process (milling, turning, grinding, EDM) controlled by computer numerical control for repeatable precision manufacturing.
- [Multi-Axis Machining](https://jc-machining.com/glossary-term/multi-axis-machining/): Definition of multi-axis machining — CNC machining using 4 or more simultaneous axes of motion, enabling complex 3D geometries and undercut features in a single setup.
- [Machining Center](https://jc-machining.com/glossary-term/machining-center/): Definition of machining center — a CNC machine tool with an automatic tool changer capable of performing multiple operations (milling, drilling, boring, tapping) in one setup.
- [Horizontal Machining Center](https://jc-machining.com/glossary-term/horizontal-machining-center/): Definition of horizontal machining center — a CNC machining center with a horizontal spindle axis, enabling chips to fall away and efficient four-sided machining of prismatic parts.
- [Machinist](https://jc-machining.com/glossary-term/machinist/): Definition of machinist — a skilled craftsperson trained to set up and operate machine tools for precision metal cutting, grinding, and finishing operations.
- [3D Printing](https://jc-machining.com/glossary-term/3d-printing/): Definition of 3D printing — an additive manufacturing process that builds parts layer by layer from digital files; contrasted with CNC's subtractive approach to prototyping.
- [Additive Manufacturing](https://jc-machining.com/glossary-term/additive-manufacturing/): Definition of additive manufacturing — the process family that builds parts by adding material layer by layer (3D printing), as opposed to subtractive CNC machining.
- [Accuracy](https://jc-machining.com/glossary-term/accuracy/): Definition of accuracy in machining — the degree to which a machined dimension conforms to its nominal target value; distinct from precision (repeatability).
- [Inspection](https://jc-machining.com/glossary-term/inspection/): Definition of inspection in precision manufacturing — the measurement and verification of machined parts using CMMs, gauges, and optical instruments to confirm dimensional conformance.
- [Setup](https://jc-machining.com/glossary-term/setup/): Definition of setup in CNC machining — the work of installing tools, fixtures, and workpieces and entering offsets before a machining operation begins.
- [Fixture](https://jc-machining.com/glossary-term/fixture/): Definition of fixture — a custom workholding device that locates and clamps a workpiece precisely and repeatably in a machine tool for accurate machining.
- [Jig](https://jc-machining.com/glossary-term/jig/): Definition of jig — a workholding device that also guides the cutting tool to the correct position, used for drilling, boring, or reaming operations.
- [Indexing](https://jc-machining.com/glossary-term/indexing/): Definition of indexing in CNC machining — the precise rotation of a workpiece or tool to a specific angular position for machining features evenly spaced around a circle.
- [Offset](https://jc-machining.com/glossary-term/offset/): Definition of offset in CNC — a programmed compensation value entered into the machine control to account for tool radius, tool length, or workpiece origin deviation.
- [Quill](https://jc-machining.com/glossary-term/quill/): Definition of quill — the vertically sliding spindle housing on a manual milling machine or drill press that moves the spindle axially during drilling operations.
- [Overhang](https://jc-machining.com/glossary-term/overhang/): Definition of overhang — the unsupported length of a cutting tool extending beyond the tool holder; excessive overhang reduces rigidity and causes vibration.
- [Cycle Time](https://jc-machining.com/glossary-term/cycle-time/): Definition of cycle time — the total time required to complete one machined part, including cutting, tool changes, and repositioning; a key production efficiency metric.
- [Material Removal Rate](https://jc-machining.com/glossary-term/material-removal-rate/): Definition of material removal rate (MRR) — the volume of material removed per unit time in a machining operation; used to evaluate productivity and compare processes.
- [Metal Removal Rate](https://jc-machining.com/glossary-term/metal-removal-rate/): Definition of metal removal rate — the volume of metal removed per minute in turning, milling, or grinding, calculated from depth of cut, feed rate, and cutting speed.
- [RPM – Rotations Per Minute](https://jc-machining.com/glossary-term/rpm-rotations-per-minute/): Definition of RPM — the rotational speed of a machine spindle or workpiece; combined with diameter, determines cutting speed at the tool tip.
- [Torque](https://jc-machining.com/glossary-term/torque/): Definition of torque in machine tools — the rotational force applied by the spindle motor to the cutting tool; limits the depth of cut and feed rate for a given material.
- [Runout](https://jc-machining.com/glossary-term/runout/): Definition of runout — the eccentricity or wobble of a rotating tool or workpiece measured radially or axially; excessive runout causes poor dimensional accuracy and surface finish.
- [Scoring](https://jc-machining.com/glossary-term/scoring/): Definition of scoring — surface damage or scratches on a machined part caused by chips, tool edge damage, or abrasive contamination during machining.
- [Swarf](https://jc-machining.com/glossary-term/swarf/): Definition of swarf — the metal chips, turnings, and grinding debris produced during machining operations; managed through chip conveyors and cutting fluid systems.
- [Tramming](https://jc-machining.com/glossary-term/tramming/): Definition of tramming — the process of adjusting a milling machine head to ensure the spindle is exactly perpendicular to the machine table.
- [Nomenclature](https://jc-machining.com/glossary-term/nomenclature/): Definition of machining nomenclature — the standardized names for the geometric features, angles, and surfaces of cutting tools and machine components.
- [Linear Axis](https://jc-machining.com/glossary-term/linear-axis/): Definition of linear axis in CNC — a controlled translational axis (X, Y, or Z) along which the machine table or spindle moves in a straight line.
- [Axis](https://jc-machining.com/glossary-term/axis/): Definition of axis in CNC machining — a controlled direction of motion in a machine tool; standard 3-axis machines have X, Y, Z; multi-axis machines add A, B, C rotary axes.
- [Y-Axis](https://jc-machining.com/glossary-term/y-axis/): Definition of Y-axis in CNC machining — the lateral linear axis of motion, typically controlling left-right movement of the machine table or workpiece.
- [Backlash](https://jc-machining.com/glossary-term/backlash/): Definition of backlash in machine tools — the lost motion or play in a machine's drive system when the direction of movement reverses; compensated in CNC control software.
- [Balancing](https://jc-machining.com/glossary-term/balancing/): Definition of balancing in machine tools — the process of equalizing mass distribution in rotating components (grinding wheels, spindles) to minimize vibration at operating speed.
- [Air Gap](https://jc-machining.com/glossary-term/air-gap/): Definition of air gap in machining — the clearance space between a tool and workpiece before machining engagement; also the gap in magnetic workholding systems.
- [Automatic Loading and Unloading](https://jc-machining.com/glossary-term/automatic-loading-and-unloading/): Definition of automatic loading and unloading — robotic or gantry systems that transfer workpieces to and from machine tools automatically, enabling lights-out and high-volume CNC production.
- [Hardness](https://jc-machining.com/glossary-term/hardness/): Definition of hardness in materials and machining — the resistance of a material to indentation or scratching, measured by Rockwell (HRC), Brinell (HB), or Vickers (HV) scales.
- [Carbide](https://jc-machining.com/glossary-term/carbide/): Definition of carbide in machining — tungsten carbide (WC-Co) composite material used for cutting tool inserts and precision wear components due to extreme hardness and wear resistance.
- [Shear](https://jc-machining.com/glossary-term/shear/): Definition of shear in metal cutting — the deformation mechanism by which a chip is separated from the workpiece along the primary shear zone by the cutting tool.
- [Vibration](https://jc-machining.com/glossary-term/vibration/): Definition of vibration in machining — oscillations in the machine-tool-workpiece system that cause chatter marks, poor surface finish, and reduced tool life.
- [Ultrasonic](https://jc-machining.com/glossary-term/ultrasonic/): Definition of ultrasonic machining — a process using high-frequency vibrations to enhance material removal in grinding, drilling, or cutting of hard and brittle materials.
- [Safety](https://jc-machining.com/glossary-term/safety/): Definition of machining safety — the practices, guards, and procedures required to protect operators from hazards including flying chips, rotating tools, and cutting fluids in CNC machining.
- [Die](https://jc-machining.com/glossary-term/die/): Definition of die in tooling — a precision-machined tool component used in stamping, forging, or forming operations to shape sheet metal or other materials.
- [Optimization](https://jc-machining.com/glossary-term/optimization/): Definition of optimization in CNC machining — the process of selecting cutting parameters (speed, feed, depth of cut, toolpath) to maximize productivity, tool life, and part quality.
- [Roughing](https://jc-machining.com/glossary-term/roughing/): Definition of roughing — the initial material removal passes in a machining operation using aggressive parameters to quickly remove bulk material before finish passes.
- [Programming](https://jc-machining.com/glossary-term/programming/): Definition of CNC programming — the process of creating G-code instructions that define tool movements, speeds, feeds, and operations to be executed by a CNC machine.
- [G-Code](https://jc-machining.com/glossary-term/g-code/): Definition of G-code — the standard CNC programming language using letter-addressed commands (G00, G01, M03, etc.) to control machine axes, spindle, and auxiliaries.
- [Part Program](https://jc-machining.com/glossary-term/part-program/): Definition of part program — the complete set of CNC instructions (G-code) defining all movements and operations required to machine a specific part.
- [Direct Numerical Control (DNC)](https://jc-machining.com/glossary-term/direct-numerical-control-dnc/): Definition of DNC — a system that transfers CNC part programs directly from a computer to one or multiple machine tools, enabling centralized program management.
- [Adaptive Control](https://jc-machining.com/glossary-term/adaptive-control/): Definition of adaptive control in CNC machining — a system that automatically adjusts cutting parameters (feed, speed) in real time based on measured process feedback such as spindle load.
- [CAD – Computer Aided Design](https://jc-machining.com/glossary-term/cad-computer-aided-design/): Definition of CAD — computer software used to create precise 2D drawings and 3D solid models of parts; the source files used to program CNC machining.
- [CAD/CAM](https://jc-machining.com/glossary-term/cad-cam/): Definition of CAD/CAM — integrated computer-aided design and manufacturing software that converts 3D part models into CNC toolpath programs automatically.
- [CAM Pin](https://jc-machining.com/glossary-term/cam-pin/): Definition of cam pin — a precision-machined pin used in mold or tooling mechanisms to translate rotary motion into linear motion for actuating slides or lifters.
- [Blind Hole](https://jc-machining.com/glossary-term/blind-hole/): Definition of blind hole — a drilled or bored hole that does not pass completely through the workpiece; requires careful peck drilling and chip management.
- [Cutoff Wheel](https://jc-machining.com/glossary-term/cutoff-wheel/): Definition of cutoff wheel — a thin abrasive disc used to cut workpieces to length; also called a parting wheel in grinding applications.
- [Die](https://jc-machining.com/glossary-term/die/): Definition of die — see main die entry under General CNC Machining section.
- [Drill (general)](https://jc-machining.com/glossary-term/drill/): Definition of drill — see main drill entry under CNC Milling and Turning section.
- [Wear](https://jc-machining.com/glossary-term/wear/): Definition of wear in machining — the progressive loss of material from cutting tools, grinding wheels, or workpiece surfaces due to friction, abrasion, or adhesion during machining.
- [Travel](https://jc-machining.com/glossary-term/travel/): Definition of travel in CNC machine tools — the maximum linear distance an axis can move; determines the maximum workpiece size the machine can accommodate.
- [Dwell](https://jc-machining.com/glossary-term/dwell/): Definition of dwell in CNC machining — a programmed pause in tool movement at a specific point, used in drilling cycles to clean up holes or in grinding to spark out.
- [Electroplated](https://jc-machining.com/glossary-term/electroplated/): Definition of electroplated abrasive — a grinding tool where abrasive grains (diamond or CBN) are bonded to the wheel by a single layer of nickel electroplating, providing maximum grain protrusion and aggressive cutting.