I am using a mini mill to mill the lead screw mount bracket for a mini lathe. The bracket appears to be cast iron, although I have no way of finding out what type. I have tried 2 straight center cutting flutes, 4 straight, slow and high spiral center cutting flutes. I have tried them at slow speed and slow feeds, slow speed and high feed and fast speed at high feed. Duh, it still always tries to gouge into the work either at the start or end of the cut. Slow speed means about 400 rpm and fast is about 1700. Feeds where either 5 or 10 IPM. The cutters are all 3/8" shank and cutting diameter. Some are HSS some are carbide coated and non coated.
- posted
19 years ago