On 13 Apr 2004 10:33:57 -0700, (Ed) wrote:

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

Get some slivers of 0.0025 shim or wire to use as centreing wedges (or
carefully carved matchsticks). and use Loctite 638.

The only problem is that you will need to heat the pulley if you want to get
it off again.

Will you have to make a custom size key, or do the pulley and shaft have the
same key widths?


HTH
Mark Rand
RTFM