Gene Heskett wrote: > Now if someone knows where I can buy an 8-32 tap that can tap an 8-32 blind > hole pre-drilled .250" deeper than the needed threads, tapped as deep as > the tap is long and do it repeatedly for a dozen holes before I am rigging > to EDM its broken pieces out of the hole, I am all ears. And it may have > to do it in a piece of tool steel right out of the paper sleeve. > I buy 5 or so at a time from MSC, J&L, KBC and similar outfits. For shallow holes or thin sheet material, I use spiral FLUTE taps, they bring the chips up the hole just like a twist drill. Fantastic! But, on deep holes, they will bind up with chips and break sometimes. So, for those I often use spiral point taps. I did a fixture plate in 3/8" aluminum with 288 10-32 holes in one setup, with rigid tapping. The tap is still about as sharp as when new!
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