- Joined
- Jan 20, 2018
- Messages
- 5,711
Doing some roughing on the mill yesterday with a 3/8 HSS rougher. I needed to make two passes, almost full width and .550 deep and 3 inches long. Feeling brave, I decided to take each in one pass. The material was 4140HT, at 325 rpm and modest feed the first pass went smoothly. As I started the second pass I nudged the feed up just a hair. Everything looked good so I walked off to do something else while the cut finished. When I got back I found, to my horror, that the endmill had sucked down almost .200 while I was away. Threw the part in the bin, turned off the lights and went outside to do something I felt more qualified to do, chainsaw work on a downed tree.