Global CNC Grinding Services

JC Machining offer an unrivaled range of high precision CNC grinding services to our global clients


CNC Optical Profile Grinding & Cylindrical Grinding Services

We provide a wide range of  CNC grinding services to our global customers, including Optical Profile Grinding and Tungsten Carbide Grinding. In this article we will focus on optical profile grinding and cylindrical grinding as two types of CNC grinding of critical importance to manufacturing industries in 2023.

Optical Profile Grinding

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Optical profile grinding technology is used to manufacture complex and intricate molds and cutting tools with very high precision. A historic trend that continues through 2023 and for the foreseeable future is for die parts and tools to become increasingly complex and precise. The demand for CNC grinding of complex shapes with very high surface accuracy is steadily increasing.

Optical profile grinders enable the operator to view the CNC grinding process on a magnified visual display, and use this to check progress against the desired template. We use the WAIDA SPG-X optical profile grinder to manufacture high precision parts because it has state of the art features including extremely clear LED image projection technology.

Optical profile grinding can be used to manufacture long, narrow, toothed, splined or slotted components and is a flexible technique that is used to grind both external and internal teeth when very precise internal or external profiles are required. Typical applications of optical profile grinding include:

  • high precision mold parts
  • cutting tools
  • precision machine components
  • punches and dies

This technique is well suited to prototyping and series production of very fine components where precision finishing is of utmost importance. Cutting wheel technology can increase the applications for profile grinding, including thin wall applications using high precision ceramic bonded Polycrystalline Diamond (PCD) and Polycrystalline Cubic Boron Nitride (PCBN / CBN) grinding wheels.

Cylindrical Grinding

External cylindrical grinding is generally used for grinding workpieces that are symmetrical around the axis of rotation, with the workpiece clamped between centers. Types of cylindrical grinding are defined by how the workpiece is clamped and the direction of the feed. Cylindrical grinding is most suitable for:

  • objects with a central axis of rotation
  • production grinding of a series of identical objects
  • precision finishing of cylindrical objects

Cylindrical grinding is a versatile technique that can be used for internal and external grinding, form grinding, and centerless grinding. External cylindrical grinding is commonly used to manufacture the following standard components:

  • jet needles for injection systems
  • bearing seats of camshafts
  • valve tappets for the automotive industry

Because the standard clamping system for external cylindrical grinding is between centers, the workpiece must be precisely centered. Long, thin, or heavy workpieces must be adequately supported to ensure accurate geometry without distortion or vibration.  Variations on cylindrical grinding include:

Cylindrical grinding is used for series production of precision tools including drills and cutters. In this application, peel grinding is commonly used to improve production speed and accuracy. Peel grinding has higher infeed characteristics with fewer cuts resulting in an oscillating cutting movement. Our Rollomatic Shapesmart NP5 pinch/peel grinding machines are ideal for this application.

High Precision CNC Grinding Technology

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Our portfolio of CNC grinding machines includes the Swiss Rollomatic Shapesmart® NP5. This is a 5-axis cylindrical pinch/peel grinding machine with an integrated 3-axis robot loader, and is dedicated to cylindrical grinding of carbide, HSS and stainless steel components. Designed with a focus on the highest achievable surface finish and concentricity, the NP5 can perform a range of grinding tasks with diameters from 0.025 – 25 mm (.001″– 1″).

Technical Specifications For CNC Grinding Services

  • ID / OD Grinding Tolerances ± 0.00007″ (±0.002mm)
  • Roughness: Ra 0.08mm
  • Cylindricity to ±0.0002″ (±0.005mm)
  • Roundness to ±0.0002″ (±0.005mm)
  • Materials Hardness: Up To HRA 94.5

Pinch & Peel Grinding For Rapid Cycle CNC Grinding

The “pinch and peel” method carries out rough grinding and finishing in one pass through the machine. This innovative method reduces cycle time by performing both processes simultaneously. On the NP5, two spindles are used to run a pair of different grinding wheels positioned on independently-controlled CNC linear slides. The first for rough grinding, and the second for the finishing pass.

Versatile Grinding Of Non-Round & Exceptionally Long Components

The Rollmatic NP5 can perform non round pinch/peel grinding of high precision punches and pins as well as non-standard shapes for molds, tool blanks and coolant slots. Pinch and peel achieves higher concentricity standards for long and thin parts than are possible with multi-pass grinding. Combined with the multi axis capabilities of the NP5, this opens up a wide range of CNC grinding applications across multiple industries:

  • Exceptionally long & thin parts – total grinding lengths of 16” & blank length of 19”
  • Form grinding of cutting tool blanks for industrial, medical & dental applications
  • Production grinding of precision punches, including non-round, oblong & form punches
  • Production grinding of die & mold components
  • Can grind coolant slots in blanks with coolant through-holes
  • Grinding of squares out of center, radiused corners, hexes & non-concentric cam profiles

Quality Control For Prototyping & Manufacturing

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Quality control is an essential step in CNC machining and CNC grinding of intricate joints and critical surface finishes to precise geometric tolerances. We are equipped to carry out designing and prototyping of custom components as well as large scale production of precision finishes to the most recent ISO 9001:2015 standards.

Our 4 quality control measures for CNC grinding & CNC machining
  1. ISO 9001:2015 certified
  2. Auto & Manual QC
  3. 3D CMM Coordinate Measuring Machine
  4. Zero-Defect Shipments

Our quality control is exceptionally thorough, and we machine and grind parts to very precise tolerances with zero defects. Contact us now to discover how our precision CNC grinding services can meet and exceed your manufacturing requirements.

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Frequently Asked Questions
  • Parts machined will follow ISO 2768-m (medium) or ISO 2768-f (fine).
  • We guarantee on following ISO 2768 standards for all CNC machined parts and other components  that do not include specific tolerance requirements.
  • For even tighter tolerances on shafts, we offer custom quotes as a free service.

In our current facilities, we have:

  • 6 CNC milling machines
  • 12 CNC lathe machines
  • 15 High-variant grinding machines
  • 46 Grinding machines
  • 11 Types of Wire-EDM Sandblaster
  • Knurling Machine

Other advanced manufacturing equipment.

There is no MOQ. We offer solutions such as one-off rapid prototypes, custom low-volume CNC machining, and mass production with short lead times.

Even though our in-house machines can machine larger parts, we recommend these sizes:

  • Maximum Turning Diameter: 250 mm
  • Maximum Turning Length: 300 mm
  • Maximum Grinding Diameter: 250 mm
  • Maximum Grinding Length: 400 mm
  • Maximum EDM Length Hole: 50mm
  • Maximum EDM Length: 250mm
  • Maximum Wire-EDM Thru hole Height: 100mm
  • Maximum Wire-EDM Length & Width Capacity: 300*500mm

Lead times will vary depending on your project complexity and our capacity:

For larger projects, in general, you can expect shipment 2-3 weeks after sending in your confirmed order.

With rapid one-off CNC prototypes, global delivery can be within 10 days.

Our sales office operates from 8:00 am to 6:00 pm local time (GMT+8)

Our factory operates 24/7 Monday to Sunday.

As Machined, Polishing, Sand Blasted, Black Oxide, TiN, TiCN, TiALN, AlCrN, DLC and Chrome Plated.

We offer free ground shipping limited to customers in Taiwan and China. For other locations, our sales and fulfillment team will work with the carriers of your choice.

We understand that your 3D data and designs are invaluable to your business. Therefore, we take the protection of your intellectual property rights (IPR) very seriously. We encrypt all files that are transferred using SSL, ensuring that they can’t be intercepted while being uploaded to our servers.All the information and any files which you upload onto our platform are stored securely, and only ever shared within our organization with those employees who need access to it in order to manufacture your parts.

We ensure confidentiality across the entirety of your order; original drawings are not shared with 3rd party suppliers as all our production is done in-house.If you would like some additional reassurance, we can sign a Non-Disclosure Agreement.

JC Machining has a CNC manufacturing team of professional engineers and machinists to reduce manufacturing redundancy, optimize CNC programming, shorten machining time, improve surface finish, and deliver the best quality machined parts.We take each project personally and carefully examine each drawing, we can then enhance the 2D/3D designs by adding clarity and detailed information and further analyze your design to accommodate any special fixturing and machining strategies used to produce your parts at a very reasonable cost.

Our manufacturing team follows strict quality control standards, delivering 100% accuracy at strict tolerances. You can also call or email us at any time, and we’ll help with ordering parts, design feedback, material recommendations, and answer any questions.