On Tue, 04 Sep 2007 23:04:00 GMT, (Doug Miller)
wrote:

In article , Tim Douglass wrote:

Now I have in hand a proper cast iron pulley. The shaft and bore both
are supposed to be 5/8", but I still can't get the pulley to go on. So
what do I do next? I'm thinking that I could heat the pulley with my
heat gun then slip it quickly in place, but I'm not sure that will
really work. Otherwise I could buff a few thou. off the shaft - it
seems to be a bit rough, so that might be a good idea anyway.

Agree with Upscale that if you're going to mod anything, it should be the
pulley arbor and not the motor shaft.

Do you have access to a good dial caliper, to measure the OD of the shaft and
the ID of the arbor? You may have a 16mm motor shaft (0.6299") instead of
5/8".

I went after them with my better dial calipers (the ones I use for
reloading rather then the shop ones) I got .625 for the pulley and
..627 for the shaft. That is probably within tolerance for the
low-budget-no-name Chinese motor maker. The shaft is pretty rough -
like it wasn't final ground after the lathe or something.

If they're close (within a couple thousandths) you can pop the pulley on by
heating it -- but probably not with a heat gun. Think torch, and heavy leather
gloves.

That's what I wondered, just how hot I would need to get things.

If they're not close... what you do next depends on what you measured with the
caliper. If the motor shaft is really supposed to be 5/8 (0.625) and it's
actually 16mm, either you take it back to the point of purchase, or you get a
16mm pulley. If the pulley is undersize, you could ream or bore it out.

I don't have the equipment to bore out the pulley that precisely, but
wouldn't be hard to take the shaft down those couple thou. with some
silicon carbide paper and a metal backing block against the spinning
shaft. I'll think about it a bit and see what other suggestions crop
up on here.

Thanks all.

Tim Douglass

http://www.DouglassClan.com

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