Technologies
CNC grinding is an abrasive machining process that removes material via a rotating grinding wheel to achieve surface finishes of Ra 0.2–0.8 µm and dimensional tolerances as tight as ±0.002mm. It is us
CNC grinding is an abrasive machining process that removes material via a rotating grinding wheel to achieve surface finishes of Ra 0.2–0.8 µm and dimensional tolerances as tight as ±0.002mm. It is used when workpieces are hardened (above 45 HRC) or when part specifications demand flatness and finis
CNC grinding is an abrasive machining process that removes material via a rotating grinding wheel to achieve surface finishes of Ra 0.2–0.8 µm and dimensional tolerances as tight as ±0.002mm. It is used when workpieces are hardened (above 45 HRC) or when part specifications demand flatness and finish quality that cutting tools cannot reliably produce.
CNC grinding removes material through abrasion rather than shear force. A spinning grinding wheel—composed of abrasive grains bonded together—makes light passes across the workpiece while the CNC controller governs feed rate, depth of cut, and wheel path with micron-level precision. This contrasts sharply with CNC milling, which uses rotating cutting tools to remove material and achieves tolerances of ±0.01–±0.05mm with surface finishes of Ra 1.6–3.2 µm per ISO 1302. Grinding is the correct process when your part requires finish better than Ra 1.6 µm, tolerances tighter than ±0.01mm, or the workpiece is hardened steel above 45 HRC—material that would deflect or dull conventional cutting tools rapidly.
CNC grinding takes four primary forms. Surface grinding finishes flat faces and plates, ideal for gauge blocks, die inserts (D2 tool steel), and precision bearing races. Cylindrical grinding shapes external diameters of shafts and pins to tight tolerance, used extensively in automotive camshafts and hydraulic valve bodies. Internal grinding machines bores and internal profiles in bushings and bearing housings. Centerless grinding handles high-volume cylindrical stock—hydraulic rods and bearing races—without fixturing, achieving 4–6× the throughput of conventional grinding. Engineers in Cairo, Alexandria, and across Saudi Arabia (Jeddah, Riyadh, Dammam) specify grinding for aerospace landing gear shafts, injection pump components, and crankshaft finishing—parts where surface integrity and dimensional repeatability are non-negotiable.
At Entag, we machine hardened tool steels (D2, H13, EN31) and stainless alloys to Ra 0.2–0.4 µm finishes and ±0.002–±0.005mm tolerances per ISO 286-1 IT4–IT6 grades—without minimum order quantities. Upload your CAD file to see how grinding fits your design.
What is the difference between CNC grinding and CNC milling?
CNC milling removes material using rotating cutting tools and achieves tolerances of ±0.01–±0.05mm with Ra 1.6–3.2 µm finishes. CNC grinding uses an abrasive wheel to achieve tolerances as tight as ±0.002mm and Ra 0.2 µm—making it the correct choice for hardened materials or parts requiring mirror-quality surfaces. See CNC machining tolerances for detailed comparison.
What tolerances can CNC grinding achieve?
CNC grinding routinely achieves dimensional tolerances of ±0.002–±0.005mm (IT4–IT6 per ISO 286-1) and surface finishes of Ra 0.2–0.8 µm per ISO 1302. These are significantly tighter than milling or turning can produce, which is why grinding is specified for bearing seats, gauge components, and precision tooling.
What materials can be CNC ground?
CNC grinding is suitable for hardened steels (45–65 HRC), tool steels (D2, H13, M2), bearing steels (EN31), tungsten carbide, ceramics, and hardened aluminium alloys. It is the preferred finishing process for materials too hard for conventional cutting tools to machine accurately.
What are the main types of CNC grinding machines?
The four main types are: (1) Surface grinders for flat faces and plates; (2) Cylindrical grinders for external diameters of shafts and pins; (3) Internal grinders for bores and internal profiles; (4) Centerless grinders for high-volume round bar stock and hydraulic rods. Each is suited to specific part geometries and production volumes.
When should I specify grinding instead of turning or milling?
Specify CNC grinding when your part requires surface finish better than Ra 1.6 µm, tolerances tighter than ±0.01mm, or when the workpiece is hardened above 45 HRC. Grinding is also required for flatness tolerances below 0.005mm on mating faces or for bearing-fit diameters where interference fits are critical.
Is CNC grinding available for small-batch and prototype orders in Egypt and Saudi Arabia?
Yes. Entag's on-demand platform provides CNC grinding for low-volume prototype runs and series production in Egypt (Cairo, Alexandria) and Saudi Arabia (Riyadh, Jeddah, Dammam). Engineers upload a CAD file, receive a quote within 24 hours, and parts are produced to drawing specifications without minimum order quantity constraints.
Ready to start your project? Request a quote on Entag — upload your CAD file and get a price in 24 hours.
