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Step drills are really for sheet metal. How good is your hand drill? If you do a pilot hole with 3/16 (5mm) and grind the outer tip of the cutting lip angle a little flatter so it does not cork screw in as it breaks through it should be pretty quick to do 100 holes. I have a nice 2hp geared head drill press in the garage you can use, but you are a long ways away.
Zeke posts faster than I do.
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Last edited by 908/930; 10-20-2020 at 10:29 AM..
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