If you have a clamp type knurler then knurl the shaft on the new motor till
it grows to the proper size.
lg
no neat sig line

"Ed" wrote in message
om...
I'm going to replace the AC motor on my Lathemaster 8x14 lathe with a
DC treadmill motor as I want varible speed. (I checked & can't find a
3-phase motor that small, otherwise I'd use a VFD).

Anyway, the original 1 HP motor has a 16mm keyway shaft (0.630") and
the new DC motor has a 5/8" (0.625") keyway shaft.

How do I deal with the 0.005" difference? Is 0.005" within the normal
tolerance range for pulley ID's and I can forget it? Or should I
machine, split, and press fit a very thin bushing into the original
pulley set? I want to use the original pulley set as it includes a
timing gear.

Regards,
Ed Ferguson