For die-cast aluminum gearbox housing, we recommend PCD milling cutters. It can reach high-speed milling with the advanced machine, you can get sharp cutting, and also save your time of changing tools. Project: Rough boring for D59 & D85 hole Workpiece: Gearbox housing, Die-cast aluminum RPM: S = 5,000 r/min Feed rate: F = 1500m/min, 600m/min Life time: 20,000 pieces