Roughing
- Use high cutting speeds (vc = 150-250 m/min) to avoid built-up edge.
- In roughing we recommend running dry, without cutting fluid, to minimize problems with thermal cracks.
|  | Finishing
- In finishing, cutting fluid, or preferably mist coolant/minimal lubrication, is sometimes necessary to improve the surface finish. There are fewer problems with thermal cracks in finish milling, because the heat generated in the cutting zone is lower.
- With a cermet grade, CT530, sufficient surface finish can be obtained without cutting fluid.
- A feed, fz, that is too low can cause higher insert wear because the edge is cutting in the deformation hardened zone.
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