- Joined
- Sep 14, 2014
- Messages
- 735
Backing plate? Done. Reseats dead nuts on the spindle shoulder. Chuck? The centering "shoulder" on the backing plate is under cut so the chuck has no tight spots fitting onto the backing plate. To be determined is it under cut enough that it can be tapped into alignment. Right now tapping makes no difference.1. I would start by checking to see if I can reliably remove and reseat the the chuck. This will determine if there is an issue with the register to the lathe spindle.
I will retest the three positions. If the run-out remains consistent, then I'm going to under-cut the backing plate to chuck centering shoulder by ~ .010 smaller than the largest measured TIR and see if I can tap the chuck into alignment.2. If the runout remains constant in magnitude and orientation over multiple installs, then I would move on to checking the runout of the backing plate to chuck register. That good, the issue is in the collet socket or the collet.
Will have to educate myself on measuring angular run out.3. Check the socket for runout at two positions to determine both radial and angular runout. keep in mind that the effect of angular runout is is magnified the further away from the chuck you are so measured runout of a few tenths in the socket can result in significant measured radial runout at an inch or two from the collet.
I think I'll start with this. I ended up with two Hardinge indexers, one threaded, the other the Hardinge taper & "bowtie" and I have a collet holder for the 10EE (yes, it does beg the question "why?" Answer was for a semi-permenant set up for an Eccentric Engineering Turnado). So too easy to cross check the collet to be sure I'm not chasing a ghost.If everything looks good, then the next suspect is the collet itself. This can be evaluated by checking multiple collets and/or by checking in different collet fixtures. Mark everything with a Sharpie so you can determine if direction is consistent.
Thanks,
Ron