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MPaulHolmes · 03-02-2011, 05:43 PM

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.

03-02-2011, 05:43 PM	#4428 (permalink)
MPaulHolmes PaulH Join Date: Feb 2008 Location: Maricopa, AZ (sort of. Actually outside of town) Posts: 3,832 Michael's Electric Beetle - '71 Volkswagen Superbeetle 500000 Thanks: 1,368 Thanked 1,202 Times in 765 Posts	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. __________________ kits and boards