b'chipbreaker and the application.The critical performance characteristic is to be able to curl and break the chips across the entire application range of that chipbreaker design, he said.Dillaman added that if the rake is not steep enough or the chipbreaker groove is too shallow or wide, the workpiece material will not break and may create long, stringy chips.For CVD-coated inserts turning conventional steel, Garud said Walter USA labels the geometries RP (R for roughing and P for the ISO P material group, which is steel). HU geometries (H for heavy duty and U for universal ISO P and M material groups, in which M is stainless steel) are suitable for turning stainless as well. Turning stainless, however, might require a PVD coat-ing, and the HU5 geometry is available in both CVD and PVD grades.Typically, stainless steels need sharper geome-tries to shear the metal better and also higher positive A GA5035 insert rough-turns steel.GreenleafA D A P T I V E G R I N D I N G S O L U T I O N S Rollomatic Groupctemag.com/cteguide.com37Turning.indd 37 3/16/23 1:46 PM'