What is this used for?

rickv1957

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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 RickIMG_5244.JPGIMG_5245.JPG
 
Tap holder?
 
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.
 
Looks like a special shop made tool for a specific use.
 
Looks like it could be a driver for the tang on a morse taper tool.
 
Looks like the inner section fits into the internal threads of the 5C collet. Try unscrewing it from the collet.
 
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.
 
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?
 
Memory says I think that's a broach holder such as for cutting splines...or for Swiss automatics?
 
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