mystery chuck

It's an _old_ drill press chuck. This is the way it was between the setscrew socket types and when Mr. Jacobs came along.

GTO(John)

Are the jaws made with alternating projections so the two overlap and close down to near zero size? If so, it sounds like a much earlier style of chuck which was used on drill presses as well as on lathe tailstocks. The opposing 'V' grooves center a round drill shank with no problem.

They were killed off by the Jacobs geared key chucks when those became common, and are no longer in production.

Enjoy, DoN.

Oh. I have one of those too. The acme thread is LH on one side, and RH on the other, so the jaws close down from both sides. In mine the jaws are interleaved, as you look down the diamond shaped hole you see alternating right and left jaws.

Jim

================================================== please reply to: JRR(zero) at yktvmv (dot) vnet (dot) ibm (dot) com ==================================================

Wood spur bits - for brace and bit. But they make those in steel drills.

In fact, I made a main chuck body used the V spring jaws and the screw on nose for my lathe. I don't recall what made me do it, maybe something to do.

IIRC, I tempered the piece so it would be a little stronger. Don't know where it is, if I still have it.

Martin