In article ,
Harold and Susan Vordos wrote:

"CAMCOMPCO" wrote in message
oups.com...

Can't ya put a set screw in the chuck to keep it from unscrewing? Just
a thought..

It's sort of a Mickey Mouse way to go, even if it works for the circumstance
at hand at the moment..

I've seen posted (here or elsewhere) an interesting approach for
a Myford (a good UK model engineer's lathe). The chuck has bolted to
the backplate a collar which surrounds the register diameter of the
spindle, with a slot out to one edge, and a screw crossing the slot, so
when it is tightened, the collar binds on the spindle so it won't easily
unscrew.

This is *not* as positive as I would like, which is why I
replaced the spindle in my Clausing with an L-00 one (long taper with
key, and a threaded draw-up ring to hold the chuck firmly on the taper.)

The two problems which I can see with the clamp collar a

1) Under serious cutting load it *can* slip, just about the time
you've decided to trust it.

2) If you *don't* tighten it every time, I could see that clamp
screw possibly working lose and backing out when the lahte is
taking a cut which is chattering -- much to your surprise as it
starts bashing into the bed or bounces off a wall or the ceiling
(or *you*).

This second risk could be minimized by bolting a retaining
plate over the screw head -- with a hole large enough to accept
the allen wrench, but not the head of the capscrew.

Enjoy,
DoN.
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