On Wed, 12 Apr 2006 08:50:19 -0700, "Glenn"
wrote:



The other reason not to spin up a bearing with air:
Consider the setting.. You just cleaned out a nice bearing and want to dry
the solvent out. You spin it up with air to MHS speed and suddenly it
starts feeling rough and noisy. You just dislodged a piece of your favorite
hard stuff that went into the bearing race and got mashed at even a nice
"safe" 30,000 RPM. If you are spinning up a bearing dry you are running at
very high speeds with no lubrication and no shields or seals.
Having said that .. they sure make some interesting sounds and go really
fast when you release them on the garage floor Dad was NOT amused LOL
Glenn

IIRC there was a post some years back about a fair sized, spun up
bearing released to travel down the street with startling (to some
innocent drivers) results.
Gerry :-)}
London, Canada