What is this used for?

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rickv1957

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Dec 14, 2014
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Hello,
This was in a box that came with the South Bend 10L I bought.
Does anyone know what it used for? It is welded into collet, and
you can't fit allen wrench in the back.
Thanks Rick IMG_5244.JPG IMG_5245.JPG
 

ThinWoodsman

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Jul 8, 2018
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Probably a fixture for repeat work? If it's welded and doesn't unscrew out of the collet, then it was a setup-once-and-useforever sorta thing. Do the metal bars either side of the round hole move? that would make it a clamp.
 

JimDawson

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Feb 8, 2014
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Looks like a special shop made tool for a specific use.
 

derf

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Oct 3, 2015
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Looks like it could be a driver for the tang on a morse taper tool.
 

Superburban

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Looks like the inner section fits into the internal threads of the 5C collet. Try unscrewing it from the collet.
 

rickv1957

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Dec 14, 2014
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Can't adjust anything, diameter is .375, flats are .312 , the set screw in back serves no purpose? It is welded in near the rear threads. Could it be something a gunsmith coud use? Cleaning out and don't want to throw something out that someone can use.
 

ThinWoodsman

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Set screw is probably an artifact of whatever arbor was shoved into that 5C collet. Perhaps it used to be an end-mill holder or was an arbor extension or something.
So, the opening does not adjust, meaning it is for a specific size and shape part (or tooling). Is the hole a through-hole? or is there effectively a depth-stop?
 

Greybeard

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Nov 12, 2019
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Memory says I think that's a broach holder such as for cutting splines...or for Swiss automatics?
 
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