- Joined
- Feb 14, 2014
- Messages
- 28
Good afternoon folks,
I have just bought a used lathe. I have change a few bearings in the cross feed slide and also in the compound. It started out with .150" backlash in it. Now it has .015" backlash. That was as tight as I could achieve so far.
I then tried to turn a 1.5" piece of 1018 crr. I had about 2.5 inches sticking out of my 4 jaw chuck. I have tried carbide insert tools and ground HSS tools. With the sharp pointed HSS I ground it does better but still unsatisfied with the finishes. The chatter is horrible. Not a loud whiney sound, but more like a low vibrating rubbing sound. I have benn taking from .01" to .02" per cut. And I have tried from .0015 per rev to .004 per rev with not much change in finish. I have tried 100, 240, 320, 400, 800, 1000 RPMs and still it chatters.
I have tightened the gibs on the cross and compound to where its not to easy to move them, but I am sure they are tight. A little tighter than I would like to leave them though.
I found that the chuck mounting bolts took a 1/4 turn on every one to tighten down, but no change when tightened.
Where should I be looking or what items should I check to find out the cause of the issue.
I found on thread here , pretty long one about a grizzly and chattering. I have checked everything except my bearings and main shaft. Is there a procedure to take off the chuck and check out the shaft it mounts onto to see if I have a problem?
I may have left out some info but I tried to get it all in here, Thanks for look. Any help would be appreciated.
Thanks,
Dan Reed
I have just bought a used lathe. I have change a few bearings in the cross feed slide and also in the compound. It started out with .150" backlash in it. Now it has .015" backlash. That was as tight as I could achieve so far.
I then tried to turn a 1.5" piece of 1018 crr. I had about 2.5 inches sticking out of my 4 jaw chuck. I have tried carbide insert tools and ground HSS tools. With the sharp pointed HSS I ground it does better but still unsatisfied with the finishes. The chatter is horrible. Not a loud whiney sound, but more like a low vibrating rubbing sound. I have benn taking from .01" to .02" per cut. And I have tried from .0015 per rev to .004 per rev with not much change in finish. I have tried 100, 240, 320, 400, 800, 1000 RPMs and still it chatters.
I have tightened the gibs on the cross and compound to where its not to easy to move them, but I am sure they are tight. A little tighter than I would like to leave them though.
I found that the chuck mounting bolts took a 1/4 turn on every one to tighten down, but no change when tightened.
Where should I be looking or what items should I check to find out the cause of the issue.
I found on thread here , pretty long one about a grizzly and chattering. I have checked everything except my bearings and main shaft. Is there a procedure to take off the chuck and check out the shaft it mounts onto to see if I have a problem?
I may have left out some info but I tried to get it all in here, Thanks for look. Any help would be appreciated.
Thanks,
Dan Reed