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Old 11-27-2010, 05:51 PM   #3
tonypaul
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Join Date: Nov 2009
Location: Austin Tx
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Re: Show me your holes....

Quote:
Originally Posted by LONGHAIR View Post
First and foremost, do NOT use a regular "twist drill" type bit. You will be very up-set by the bending/tearing that they can do in unsupported sheetmetal. They turn into a "cork-screw" as they break through. This gets you a big nasty burr, a dent, or a "volcano". Bits that are designed for sheetmetal don't have spiral flutes, so they don't do that. "Step drills" are great for this kind of thing.
Thanks for that info! I did drill some already and a couple holes came out a little corkscrew. I bought some brand new drill bits and drilled some more and the rest came out fine. My drill bits where really old... I need to research into "Step drills"...... Where can I get some of these?

Thanks again!
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