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Old 11-10-2012, 11:07 PM   #9
Beastly Adventurer
Joined: Oct 2004
Location: Anchorage, formerly Spenard (hub of the universe)
Oddometer: 5,930
fly cutter is one way to make a big hole,

if you have time and a drill.... draw the circle, drill holes along the circle that just barely touch & file smooth.

as for the rectangle... drill a hole in each corner & use the cutoff wheel to run between the holes. clamp a guide strip if need be, and don't try to cut all the way through in the first pass. the thicker the metal, the more passes
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