On 8/18/2012 9:49 AM, Gene Heskett wrote: > On Saturday 18 August 2012 09:46:26 Kenneth Lerman did opine: > [...] >>> I have done quite a few 6-32 holes in 7078-T6 but can't claim a lot of >>> experience in tapping the common alu stock sold at Lowes/TSC, its >>> pretty soft. ISTR the last batch of 4-40's I tapped about 3/8" deep, >>> blind, took about 4 trips back out to clear the chips. Not much chip >>> room in a common hand tap. >> Try using roll form taps. They don't generate chips. >> >> Regards, >> >> Ken >> > Do they not require near breakage torque and EP lubricants? > > Cheers, Gene I've only used them in aluminum and never broken one. I usually brush the tap with a little motor oil. I don't know what is recommended.
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