- Joined
- Dec 19, 2014
- Messages
- 167
I have had to remill a few keyway slots on R8 collets through the years because of not fitting. The slots seemed to be the most common problem. I have also had to replace a few thread inserts in a few because they were case hardened which caused the threads to become tight and caused the threads on the drawbar to gall and strip. I usually try the drawbar in all new collets before even tying then in a machine. If tight I check to see if it has a threaded insert that can be changed (usually only the better r8 collets have the inserts ). The next thing is how it fits into the spindle. Sometimes I will use some bluing to see where it is binding before I go further.
Actually, my mill doesn't even have a key for the keyway. Somebody in the past removed it. I remember reading that removing the collet key was a common practice with machinist. I haven't had any problems with out the key.