"Don W" wrote in message
om...

Roger wrote:
But as to safety, I've had a half inch drill bit pull a piece a 1/4
inch Aluminum out of the clamps and try to beat the column to death,
but I've never seen anything throw a piece like an innocent looking
surface grinder. I saw one smash a hole in concrete block wall.

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)

At my school wood shop we had a large planer with a huge heavy duty vacuum
chip catcher located about 10 feet from a large table saw. The chip catcher
had a fairly thick metal cabinet and there were numerous deep small diameter
dents in the cabinet. These
dents were the result of improper choices made by persons using the saw.
Kick backs
from cutting small slices off the wrong side of the material resulted in
unsupported spearlike scrap pieces jamming between blade and fence and then
being propelled
off the back of the saw at high velocities. I'd carefully demonstrate this
as part of my safety classes at the beginning of each semester and point out
the dented equipment. While I taught there, I never had a student make that
particular error. Any additional dents added during my time in that shop
were carefully staged Demos.

Harold
KD5SAK