Union 3 Jaw Chuck Question

barnett

H-M Supporter - Gold Member
H-M Supporter Gold Member
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Mar 14, 2014
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I bought a 6" unknown 3-jaw chuck to put on my rotary table, $23.00 on fleabay, stated that it needed cleaned up. I disassembled and cleaned it up. It turned out to be a Union chuck. It has " class S " stamped on it. Anyone know what it means ?

It looks to me to the thru-hole has been bored out. there are 3 holes in the back that have been bored into and 3 holes thru the front. I know the 3 larger holes in the back are for a backplate.

What are the bolt holes in the back and front for ?? dust cover ??

Any ideas are welcome !

Tom
20160528_190818.jpg 20160528_190758.jpg
 
i don't know what class s is, but you got a pretty good deal.
it appears somebody did some work to it...
the holes are for mounting spindle adapters like these
lcscuscbb-_thumbnail.jpg
 
Thanks Mike. The $23 was with the shipping, i only bid $10 on the chuck with$13 shipping. It was covered in junk, the inside was full of dirt, grease and swarf. I checked it out and its still in fairly good shape inside.

Tom
 
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