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On Saturday, June 8, 2024, 4:51 PM, John Entwistle via groups.io <jentwistle3@...> wrote:

A while back we were kicking around a thread on collet chucks. There was talk of making your own, and there was talk of one on ebay UK.



One member here (sorry, I forget who) posted that he’d bought one and it had .004” run out.

Well, in a silly moment i bought one also, and mine is twice as good ‘cause it has .008” run out!!

So, I decided to go ahead and re-cut it on my unimat along the lines of the “make your own” discussion. What the heck, I can usually get under .001” and this was already threaded for the spindle and should be pretty straightforward as long as i can get the taper right, right?

So I turned it down with the idea of cutting off the threaded portion and rethreading further “up” the body, then recutting the taper inside.

But when turning it down I received an interesting surprise as shown in this photo:



It seems this chuck is not one piece, but rather an adapter that has been pressed on the end of someone else’s chuck! No wonder there was so much run out!

Not that i know what to look for I can see the different colors of the two parts:


in guess you could try to straighten this by wacking it with a hammer, but I don’t hate my spindle bearings that much. It’s not their fault I bought this!

Guess I’m gonna try the “make your own chuck from scratch route.

Best Regards
John