on 7/15/00 7:50 PM, donald smith at [EMAIL PROTECTED] wrote:
> Mike, what kind of torch have you used? A Propane won't generate enough
> heat quick enough. Something you can still try and it will help the
> crank, also. Put it in the freezer for 8-10 hours. As soon as you take
> it out have a aceteylene torch and puller ready. If it has a Rose Bud
> use it. Just put heat on flywheel and let the crank warm up by itself.
> The cold treatment on the crank will help strengthen it. A old trick
> done on car cranks and axles, it works. Also on the puller, make sure
> the bolts are at least grade 8, 8.8 or 10 is better if you ca fnd them.
> Stock puller bolts are soft and will stretch.
>
> Don "Old Man" Smith
>
Amen to that. Propane torch (unless it's oxy-propane) won't put out enough
therms. Dry ice works even better than the freezer treatment for cold
tempering and shrinking. It takes the part down to minus 80. Liquid
nitrogen's even better, but harder to work with. I haven't done this with a
Max shaft, but you might find a container big enough (maybe a picnic cooler)
to fit the shaft with the flywheel out of the tank, fill the container with
ethanol and dry ice, wait for the dry ice to stop fizzing, and drop the
shaft into mix. This might be sufficient to remove the wheel without adding
any heat. The dry ice will cool the ethanol to 80 degrees below zero and
might shrink the shaft enough to remove without pain. It'll cost maybe $20
for the ethanol, though.
Don't use flame near the ethanol, obviously, unless you want to emulate
cherries jubilee or baked alaska. And use gloves....well insulated ones.
best,
Sat Tara
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