Drive Wheel Problem

M

Mobius1

Joined
Feb 15, 2016
Messages
133
I acquired a rather large 3 HP motor to use with my belt grinder, which the spec sheets told me had a 1-1/8" shaft. I ordered a drive wheel with that bore, but it turns out the motor is metric, and is actually 28mm to be exact. This means that it has some pretty good play to it, and thus has a wobble.

My first idea was to use some metal ducting tape that I had lying around, to try and force a better fit. It helped, but it still wobbles enough that my tracking is unreliable, and the belt shimmies a bit, and grinding reliable plunge lines has become a fun experience.

I can't for the life of me find anyone that sells a wheel with a 28mm bore, so I wanted to see if anyone might have any ideas! I'd love to just buy a wheel with a smaller hole and make it larger, but I don't have a lathe or mill, so I don't think that is really an option for me.
 
I tried using some of my stainless steel foil, but it took two layers to get it snug, and I couldn't get the wobble out after monkeying with it a while. It seems like it has to be really precise to fit correctly!
 
Beer can are about 0.10mm ...I would try first with two layer .............something like this .Black is Al foil .One of my disk sander is done like that and it run right
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Ok, what ended up doing the trick was a tuna can. It was a bit over 30 thousandths, which was right on the money! It was too hard to try and get it to fit correctly when there were multiple layers, but just one of the correct size got 95% of the wobble out.
 
Awg (American Wire Gauge) 31 copper wire is .0089" in diameter. If you wind a continuous coil of it around the motor shaft it should increase the apparent diameter by .0178". If you wind it so there are spaces between the windings and coat this with a good epoxy or a metal filled epoxy such as liquid aluminum or a liquid steel and then squeezy it off smooth it should yield useful diameter shaft. Steel wire of the same diameter might work better if you can find it. If you need a key way e careful not to tear out the windings while trying to cut it.
 
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