- Joined
- Nov 9, 2018
- Messages
- 377
My Clausing 5428 had a LOT of damage on the spindle from a previous owner who tried to disassemble the machine with a hammer and chisel. I pulled the spindle and cleaned up the burrs and high spots with a cylinder lap, but I had concerns that the spindle might be damaged or I might not have lapped the bearing journals concentric. So, I re-assembled the headstock, and adjusted the preload, so there is a very slight drag by the bearings, a good spin of the spindle spins it just about a full turn, which is about what the Clausing manual recommends for preload. The bearing races and rollers looked surprisingly good, so I just cleaned and reassembled them.
So, I took a series of measurements here, and I'm seeing about 2-3 tenths of jitter in the indicator. I'm interpreting these readings as jitter, in that I do not see any out of roundness. The bumps of the dial indicator never bump in the same spindle rotation angle. Hence, I'm conjecturing that these variations are caused by bearing rollers either slightly worn, or possibly some variation in the bearing surface or rollers.
The one reading I have a slight concern was the one on the tail end of the spindle, this showed a variation of about 6 tenths or so, however there was some damage on the tail of the spindle, it might have been dropped, or something impacted it at some point. So, possibly that damage is what's causing the larger variation on the readings there.
What do you guys make of these readings, is this excessive jitter?
I'm going to have to pull the spindle out anyways, because I need to make new bushings for the back gear, so I'm not sure if I should install new bearings at this point.
I do have another thread for my lathe build, but I figure this is a very general question and might be of interest to anyone working on lathe spindle.
So, I took a series of measurements here, and I'm seeing about 2-3 tenths of jitter in the indicator. I'm interpreting these readings as jitter, in that I do not see any out of roundness. The bumps of the dial indicator never bump in the same spindle rotation angle. Hence, I'm conjecturing that these variations are caused by bearing rollers either slightly worn, or possibly some variation in the bearing surface or rollers.
The one reading I have a slight concern was the one on the tail end of the spindle, this showed a variation of about 6 tenths or so, however there was some damage on the tail of the spindle, it might have been dropped, or something impacted it at some point. So, possibly that damage is what's causing the larger variation on the readings there.
What do you guys make of these readings, is this excessive jitter?
I'm going to have to pull the spindle out anyways, because I need to make new bushings for the back gear, so I'm not sure if I should install new bearings at this point.
I do have another thread for my lathe build, but I figure this is a very general question and might be of interest to anyone working on lathe spindle.