Thanks Chris and Jim. That info was very helpful. Let me see if I can find a junker Atlas motor or powered unit and play around with it to start. I have a very fine point Oxy/Propane jewelers torch (the torch nozzle orifice is so small that it needs to be drilled in a ruby with a laser since drills don't go down to that small) so it can produce a very fine concentrated flame that I can try. Obviously have to watch and not overheat and distort the motor shaft. I also have a 13 x 30 lathe that I can potentially either hold the motor rotor in my smaller 5" 6-jaw Set True chuck or, if small enough, use a 5C collet (may have to bore out an emergency collet if the rotor comes out to be an odd size). Then I can just gently turn down the old gear with a real sharp high speed steel tool in the lathe and slip on the new one with some Loctite 603, if it is not a press fit.
Jim,
Thanks for the links. I am familiar with the induction heating units as they use those in CNC machine shrink-fit style end mill holders since these holders produce very little runout.
Thanks again for taking the time to look up that info.
Scott