I have a carbide burr for a 1/4" die grinder which I use for gouging
out welds and dimpling bolts before drilling them out. The burr is
about 3/8" diameter and 3/4" long cylindrical with a rounded nose.
Anyway, I did a dumb thing and loaned it out. Now it has a few teeth
missing where it looks like it was dropped or otherwise smacked.
Is it still safe to use? I experimented a bit and it doesn't affect
the cutting speed or quality perceptibly. I'm just worried about it
flying apart or deciding to peel off a row of teeth and fling 'em at me.
The twit who broke it moved to another shop, so I can't get a new one
"free." If it's still usable I'd like to keep using it.

--
B.B. --I am not a goat! thegoat4 at airmail dot net
http://web2.airmail.net/thegoat4/

Everyone makes a mistake like this exactly once. Now you know never to
loan tools out. I loaned out my dremel and it came back filled with
plaster dust. Had to spend an hour blowing and wiping gypsum out of
motor windings. Loaned out a drill bit set and it came back with half
the bits missing.
Now, back to the topic: It still should be usable, although the space
where the teeth are missing will probably have a tendency to clog with
metal filings. The main concern is with grinding wheels both large and
small, which once they have been dropped should be thrown away even if
there are no visible cracks. They have a nasty tendency to fly apart
when used.