CoroMill® 390

A small reduction in distance and mass between the cutting edges and the Silent Tools™ damper can enable increased depth of cut and by that a significant productivity increase, when working with long overhangs.

​A subcontractor’s productivity was limited by its end mill as the two-insert
cutter could only manage 2 mm (0.079 inch) cutting depth. When switching to a CoroMill 390 cutter with three size 07 inserts the cutting depth could be increased to 3 mm (0.118 inch). As bonus, the burr formation caused by the previous tool was nowhere to be seen when milling with the new cutter. The overall verdict: a double win for CoroMill 390 with increased productivity and tool life.

​To achieve acceptable component quality, maximum cutting depth was restricted in this application. After switching to CoroMill 390 cutter with size 07 inserts, the cutting depth could be increased, generating higher productivity. With GC1130 inserts the tool life was improved by 47%, significantly reducing cost per component.

Unstable conditions with long overhang, combined with a forged surface and coolant were causing some challenges for the insert tool life in this application. Surface quality issues, caused by flaking of the coating, set the limitation on insert tool life. By exchanging the existing solution with GC1130 inserts, flaking was significantly reduced and 57% more components could be machined.