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Collet Chuck information

YYCHM said:
Ya, that sounds like Craftex. The spindle plate and chuck have a registration and the chuck bolts straight on. The registration and bolt patterns are standardized for different chuck sizes. You would need to find a collet chuck with mounting plate that has the same registration and bolt pattern.

https://littlemachineshop.com/info/lathechuck.php

There are some options here, but their shipping is usually a killer.

Search For... - LittleMachineShop.com

How big is your chuck?
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Hey Craig you're correct about my 3 & 4 jaw chucks having a registration, my 3 jaw chuck is 4 & 15/16" in diameter. As you say there are options and work arounds to what I'm thinking although it may take time assembling the components. Should it become too pricy or cumbersome to attach and remove I would likely pass on the idea. Would be handy to have although not necessary.
 
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Sorry I was looking at the wrong lathe. Assuming its like this one then drawbar looks feasible. But as mentioned, with an MT4 ER arbor, stock protrusion to the left is limited to what the collet grips because the arbor is solid.

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Depending on what you are trying to accomplish, another option is to chuck an ER collet block in your 4J. Dial it in precisely with DTI against a gripped dowel pin, but you only have to do that once. Now you can loosen the ER nut, insert or replace new stock & it should maintain concentricity because the 4J grip is maintained. So you could do a batch of parts. And this will also allow stock to protrude into the spindle hole.
They also make hex blocks but there is no guarantee your 3J will grip it without runout, but maybe on that lathe you have a means to adjust? Anyways, food for thought.

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PeterT said:
Depending on what you are trying to accomplish, another option is to chuck an ER collet block in your 4J. Dial it in precisely with DTI against a gripped dowel pin, but you only have to do that once. Now you can loosen the ER nut, insert or replace new stock & it should maintain concentricity because the 4J grip is maintained. So you could do a batch of parts. And this will also allow stock to protrude into the spindle hole.
They also make hex blocks but there is no guarantee your 3J will grip it without runout, but maybe on that lathe you have a means to adjust? Anyways, food for thought.

View attachment 14940View attachment 14941
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Isn't this similar to what John is suggesting in his post #11?
 
Maybe. He might be suggesting making one from scratch to adapt to your lathe in a different way (not sure really).
I'm just mentioning an off the shelf ER block that which is ready to go, hardened & ground on all surfaces. But if you don't have a 4J chuck & no plans to use one, then other solutions may score higher.
 
PeterT said:
Maybe. He might be suggesting making one from scratch to adapt to your lathe in a different way (not sure really).
I'm just mentioning an off the shelf ER block that which is ready to go, hardened & ground on all surfaces. But if you don't have a 4J chuck & no plans to use one, then other solutions may score higher.
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Thanks, yes I have a 4 jaw chuck, something to think on.
 
Dusty said:
Hey Craig you're correct about my 3 & 4 jaw chucks having a registration, my 3 jaw chuck is 4 & 15/16" in diameter. As you say there are options and work arounds to what I'm thinking although it may take time assembling the components. Should it become too pricy or cumbersome to attach and remove I would likely pass on the idea. Would be handy to have although not necessary.
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If your chuck conforms to the LMS specs I linked to, there is a pretty good chance you can find an off the shelf 5C adapter that will work.

This should work for you as you have a 5" chuck...

5C Collet Chuck | 5C Collet Holder | LittleMachineShop

I'm sure there are less expensive ones out there.
 
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@YYCHM I want to mount one on my Southbend and 1 on my SM. I’ve failed twice trying to make a tight fitting threaded backplate for the Southbend. . I haven’t attempted the SM yet. It takes a D1-4 backplate.
 
Johnwa said:
@YYCHM I want to mount one on my Southbend and 1 on my SM. I’ve failed twice trying to make a tight fitting threaded backplate for the Southbend. . I haven’t attempted the SM yet. It takes a D1-4 backplate.
Click to expand...

Want to mount one for what purpose?
 
@YYCHM Colletsare great when you’re working with round stock. You don’t have to fiddle with centring your work and you can take it out and put it back in. All assuming that you have an accurate collet and chuck. I have set of 3mt and 3c collets. The 3mt don’t allow for through hole, and the 3c maxes out at ½”.
 
John I bought one of these. After a bit of fiddling around the run out is about .001", but that's good enough for most 9f the work I do. Whe I complained that the runout was twice as much as his claimed .0006" or less he refunded half the purchase price. He also sells them with semi finished backplate for threaded spindles.

https://www.ebay.ca/itm/271667554173
 
That’s the 5C chuck that I have. Through some miracle I got it down to .0003 runout.
 
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