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Old 03-02-2011, 05:43 PM   #4428 (permalink)
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Michael's Electric Beetle - '71 Volkswagen Superbeetle 500000
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With copper, for 3/16" drill bits and bigger, I use about 450 rpm. Also, I spray it with wd40, and pause and pull up regularly to keep the bit cleaned off, so the copper doesn't weld to the tip.
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