"Ignoramus12193" wrote in message
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On 2009-04-02, Tim #__#@__.- wrote:

wrote in message
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I have a few electric motors in commercial dryers with warn keyways on
the shaft end that holds the fan any suggestions on how to repair.
Keyways are 1/8 in. Thanks Martin

Buy new pulleys with taper bushing hubs.

Loctite the new bushings to the shaft, but not to the pulley. The taper
lock
to the pulley will be fine, and leaving it dry with facilitate
disassemble
someday, if needed.

This is something I have been wondering about since 3 months ago: do
these tapered pulley bushings, if thouroughly tightened, require
keyways at all or they can be used without a keyway?

Depends entirely on what you are driving, and if you Loctite them to the
shaft.

He is driving a fan with an 1/8" keyway. I'm betting this is both a low
horsepower and smooth transfer of power, and the it will work fine.

But if you drive something like a compressor with an electric motor, or a
mower blade with a gasoline engine, you will probably, but not certainly
need the key. In these examples you are driving a reciprocating load with a
continuous source, or a continuous load with a reciprocating source. So the
shock loading is a considerable factor.

He is driving a continuous load (fan) with a continuous source (electric
motor), so I bet he will be ok. The only questions is, can is find a taper
pulley for his shaft size. The 1/8" key makes me think we might be talking
about a 1/2" shaft, and I don't know if they make them that small.