Re: [CAD_CAM_EDM_DRO] Air/hydraulic Power Chuck

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.


Kim,

Those are 5C collets and lathes are what they were originally designed for. Collet lathes were very popular early on and hardly heard of lately.They used a hollow draw bar and a handwheel or a handle that simply flipped down and cam'd the draw bar to lock. They were really unusual in that I never seen one with power feed of any kind. They were very massive, precision machines but the toolpost just consisted of two crosslides on a carriage that were manually fed and then the carriage could be relocated up and down the bed by loosening, repositioning and re-tightening. I guess the 3-jaw scroll chuck and power feed South bend types eventually won out because of their versatility.

Now on to the retrofit: You would need like a 1.25" spindle bore to use 5C collets. Just buy a cheap 5C collet fixture and pull the inner sleeve out of it as it is precision ground internally to accept 5C collets. Chuck it up in the lathe and dial it in. Make a hollow drawbar with a disc on the far end for cam follower bearings to ride upon. Fashion a handle that pivots off of the machine's headstock operated manually or via Pneumatic cylinder to actuate. The cam follower bearings mounted in two yokes on the end of the handle or arm, one on one side of the disc and one on the other side. Pushing and pulling the disc, opening and closing the collet. Similar to a clutch fork and throw-out bearing in a car's standard transmission. Of course it is limited to like 1.125" with 5C collets. To take it further have two more cylinders aft, One to grab the stock and the other one to pull it a predetermined distance and then release it (no logic, electric valve, cylinders and simple limit
switches) . Fully automatic. M-codes in the software to advance the stock. My kinda machine :-) You could like go on vacation while its running. Thats basically how screw machines work unfortunately they weigh like 15 tons. Safety note about long lengths of material hanging out of the back of a tailstock unsupported. It needs to be in some sort of cage to prevent it whipping wildly at high rpms. I've got some stories about that.

Ron

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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OFF Topic POSTS: General Machining
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http://www.metalworking.com/news_servers.html

http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.

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