I am having problems w/ a new to me, very used Jacobs 900 series
collet chuck. First off, I have never used, nor have I ever seen any
one use, a collet chuck before. First problem, the collet holder
(nose pc or nut) threads on about 2/3 of the way and then frequently
binds. I can see that there is a groove in this part and a mating key
in the chuck. If I jiggle and unscrew the nut a bit it will go in
correctly about 1 time out of 4. Is there a special proceedure on
threading the collet holder to the chuck? Second problem is that I am
unable to secure the hand wheel via the locking ring. After
tightening the chuck / collet, and pushing the handwheel locking ring
against the handwheel, the locking ring does not hold the handwheel in
place when I start the lathe and engage the drive (note: I can feel a
very slight detent as I push the locking ring towards the handwheel).
The handwheel makes a pretty signifigant bang as it moves to the other
end of its travel. Same bang again when declutching. I would think
that this inertia and rapid stop of the handwheel will damage the
chuck in a short period of use - correct? What sort of a detent holds
the hand wheel locking ring in place and what sort of things to look
for in damage or misassembly to this lock ring asm?