- Joined
- Oct 4, 2016
- Messages
- 7,028
4" diameter 316 SS, 135 rpm, I set the auto feed for the least amount of chatter(still some fine vibration) as the part was going the cut became silent, going well. Very quickly there was a big vibration, and before I could shut things down, the GTN3 holder snapped. I had previously parted with the same insert, I'm wondering if the bit should have been changed before attempting another 4" SS cut. My setup for parting is to indicate the blade with a dial indicator </= .0005 at least in and out deflection of the tool post. I use the auto feed to try, and stay ahead of the work hardening, and plenty of cutting oil. I also move the blade out of the holder, and hand spin the chuck to get to fresh metal. The piece of the of the insert that was imbedded in the cut was hard to remove, and it took awhile to get it out too.
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