Re: power chucks, bar feeders etc

Graham,

Many air chuck suppliers post working details on their websites;
usually section views to express/explain why their means of
operation is better than brand X

Ballendo

P.S. Hydraulic also works. And is perhaps one of the easier types to
fabricate. Just requires precision turning and seals.

Think of a fixed length style collet chuck. Three parts, body,
collet, closer. But instead of using a screw to move the closer out
toward the TS to tighten the collet, you build a piston and "ring"
cylinder to do the moving. Again, MFR. websites will show cross
sections.



--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Graham Stabler" <eexgs@...>
wrote:

>
>
> I'm just wondering if anyone knows much about the operation of the
> typical power chuck?
>
> I'm mentally designing a small swiss-style lathe and I can't work

out

> how to automate the rear chuck, it needs to be able to grip and
> release bar stock at will even at low speeds (i.e. no centrifugal

chuck).

>
> I've seen wedge based chucks mentioned but you only seem to get to

see

> the outside of commerical ones.
>
> My only real idea has been a spring loaded collet chuck with

springs

> to keep the chuck closed on the bar stock and an external pneumatic
> mechanism to release it when required.
>
> Only minimal accuracy is required in terms of centering so I feel
> there must be some neat and dirty solutions out there somewhere.
>
> Graham
>