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Originally Posted by sanddrag
Does anyone know if it is possible to take a gear with a certain bore, weld the bore closed with filler, and then drill a new bore that is smaller? Would this work? Or instead of welding, what about pressing in a pin and then re-drilling it out?
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Possible yes. Advisable no.
We made a stepped adapter shaft to accomplish this. One end presses into the pinnion gear and the other presses over the motor shaft. We have had no problems with this and I suggest it as an alternitive to what you mentioned above.