On Sun, 22 Aug 2010 21:19:35 -0500, Don Foreman
wrote:

On Sun, 22 Aug 2010 16:06:21 -0700, "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
Max clearance would be .001".

Oops. Min clearance would be about .001". Max clearance would be
determined by how much wobble you could tolerate. Rule of thumb: .001
to .005 for nice-running wheels.