According to :
Since we sell used machine tools I have solved this problem at least a
dozen times. Saw the arbor off approximately flush with the chuck. You
were going to throw it away any way. Run the chuck up tight and tighten
it with the chuck key. Chuck it in your lathe spindle chuck and drill a
pilot hole for something like a 5/16" - 18 thread and tap it. Put a
small 1/2" drive socket over the Jacobs chuck arbor drive end and
screw a bolt through that into the newly threaded hole. That bolt will
draw the tapered stub out with almost no torque on the wrench. It is
even more cost effective when you salvage an Albrecht chuck this way.

A good one. And another related one, which starts the same has
you installing a Zerk fitting into the threaded hole, and pumping in
grease to pop it free. (Of course, that would not work with this one,
because I remember mention of it having a hole in the body which reaches
through to the arbor, so the grease would simply fill the chuck --
unless you could also tap that hole and put in a screw to plug the hole.

I'm going to be trying the Zerk and grease trick on an arbor
which a friend got from eBay with the wrong sized arbor for his lathe.
It also has too small a shoulder for the wedges to work. And if the
grease fails, there is already that threaded hole made for the Zerk to
try your trick on -- complete with nicely grease-lubricated threads to
help the process. :-)

Enjoy,
DoN.
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