On 2013-02-03, Mr.B1ack wrote:

[ ... ]

This may seem irrelevant, but if you are
grinding a lot of aluminum, creating a lot
of very fine powder, a serious static
discharge may ignite it - and aluminum
burns *very* hot.

Even worse if you are alternating sanding aluminum and
iron/steel. The iron and steel dust tends to oxidize quickly when that
finely divided, and when mixed with aluminum powder, you have a pile of
thermite in wherever the dust collects. You really don't want that to
light off. :-)

Enjoy,
DoN.

--
Remove oil spill source from e-mail
Email: | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---