Re: [CAD_CAM_EDM_DRO] novel shaftgrabber

> > I think maybe I just solved my southbend retrofit leadscrew drive
> > problem. Here's the idea.
> >
> > Buy an 11/16" 3MT collet and a 1 1/4" OD MT3 socket.
>
> That might be hard to find. The big end of a 3MT is under one inch. Why
> not turn the leadscrew OD down to .750" . Then make a sleeve with one end
> bored for a trantorque. This end can be larger than the rest of the sleeve.

Those are both standard parts, although not all dealers have the mt3
collets by sixteenths. The leadscrew journal is 11/16, which is
already less than .750, and i don't want to modify the machine more
than necessary (it is a fairly decent manual lathe).

I was originally going to use a trantorque, but one to fit over an
11/16" shaft is 1.5" od, and my sleeve would have to add to that, and
then add bearings to the sleeve od, so the assembly would rapidly eat
up the space between the screw and the side of the bed. I hit on the
collet idea so that the female clamping taper can be integral with the
sleeve that extends the screw beyond the bed for mounting the
sprocket, thereby staying small enough in diameter to be easy to
support in bearings and be able to carry the encoder disk.

Chris