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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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What Kind of Carbide Drill Bit to Drill Out a Tap?
Well, I've broken off my second 5-40 tap in cast iron (model steam
engine). One I got out with an extractor - the second one I've buggered up so much my only hope is to drill it out. I've read a number of posts about drilling them out with carbide bits. When I look in KBC, Wholesale Tool, etc., I see solid carbide jobber bits for 10 bucks or so in size 39. Will one of these do it? Because I also see a "square die" carbide bit that specifically mentions drilling out taps - but it's $35... If I need the $35 bit, so be it. But, if a regular carbide jobber bit will do it, I would obviously rather go that way. TIA, Wally |
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