On Aug 22, 5:06*pm, "Steve B" wrote:
I have an old cement mixer. *The shaft size that is on there for the steel
wheels is about .7000+. *I have some rubber tires with tubes that have a hub
axle diameter of .625, or thereabouts. *I know that all rods come in
standard fractional sizes. *Is there some standard deduction when one is
calculating a shaft versus an opening size so it will just slide on, and not
be a press fit requiring hydraulics, beating with a large hammer, or
immersion in dry ice or liquid nitrogen? *This is going to be max 200 rpm
for 200 yds, so it is not critical. *Is there a place to buy this slightly
less than nominal diameter material in a cold rolled, so it will be a little
stiffer than the normal rod?

Thanks

Steve

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The hardware stores around here have a selection of cold-drawn
shafting, which is what you want. Machines like crap, so the nominal
size had better be what you want. The one hardware store had it
labeled as drill rod, which it wasn't. Has a drawn finish vs. ground
for drill rod. You want a "running fit", such info is in the manuals,
see "Machinery's Handbook". IIRC, it runs around .001" per inch. If
all you're doing is trundling the thing around by hand, basically if
the wheels stay on, you're golden. Wouldn't matter if the clearance
was 20 thous.

Stan

Stan