On 20 Mar 2006 08:30:07 -0800 in rec.radio.amateur.homebrew, "Tim
Shoppa" wrote,
Working sheet metal in a mill or a drill press has caused some, um,
near-disasters in many amateur shops. Poor clamping resulting in
spinning sheets with sharp edges are the most common

That is deadly true; but I would think if you are going to make a
business of it that you would set up some _good_ clamping fixture
that would hold your sheet with no slipping. How is PC Board
milling done?