Precision machining
EDM, milling, turning, bar turning and drilling
Precision machining is a mechanical manufacturing method that involves removing material from a raw part (often metal) to obtain a final part with very precise dimensions, tight tolerances and often an excellent surface finish. Precision machining is carried out by electro-erosion (EDM), bar turning, milling, drilling and grinding.
Electrical discharge machining
Wire and press-fit
CGR excels in electrical discharge machining (EDM), also known as spark erosion machining, wire erosion or sinker erosion. This process can be used to machine very hard materials such as hardened steel as well as tungsten and steel carbides. EDM machining is therefore very widespread in precision tooling and mould making, while wire erosion (diameter from 0.07 mm to 0.33 mm) is becoming a common method in prototyping and small series production. We use EDM to create our own tooling.
Machining by turning and milling
Precision and rectification
We routinely machine steel, aluminium, carbide, chromium, cobalt, copper, graphite, Inconel, stain-less steel, titanium and alloys. CGR uses multi-axis CNC machining centres capable of achieving a degree of precision of less than 10 µm. Thanks to 12-point clamping jaws, developed by CGR's R&D laboratory to distribute the clamping force evenly, we have significantly improved the machining accuracy of thin hollow parts. We can now achieve precision of 3 µm during turning, a result normally only achieved during grinding!
