Re: [CAD_CAM_EDM_DRO] Air/hydraulic Power Chuck

I've spent some time thinking about doing this and done some work on it
too.

We had a job in the past where we were running off hundreds of parts and
we had to have a man basically being a bar feeder, including manually
tightening a 3 jaw chuck.

My plans include replacing the 3 jaw chuck with a bolt on spindle
collet, running a hollow draw bar through the spindle and using an air
cylinder outboard of the spindle to pull it tight.

I needed a hollow draw bar so that long barstock could be used.

I've got the drawbar machined. I used a piece of seemless tubing for
it. I cut an external thread on one end so that it threaded into the
collets. I forget the name of the collet series. It wasn't R8, it was
the other popular ones, the ones that go to 1-1/4". C5 ? Anyway, I was
happy because the drawbar still had a 1" bore, which would allow us to
use the barstock.

The production of those parts has moved to another shop and I haven't
thought about the air chuck system for quite a while.

The hardest part of building the whole system was going to be the
spindle collet holder, actually getting the right taper on the A-4
base.

On Sun, 2004-10-31 at 16:58 +0000, Tim wrote:
>
> Interested in fitting some sort of automatic chuck to
> a 12X36 Grizzly lathe.
>
> Anybody ever do this , is it possible?
>
> How does it work :-)
>
> I know the expense so it would have to be
> a great Ebay find to do this.

> sspeed33317
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