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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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Drill bits for starting holes?
Ignoramus5102 wrote:
I remember that in Russia, there were special drill bits to start holes. They had a thick shank and sharp (think 40 degrees) conical end. So they were very rigid and could start a hole precisely where it was positioned. No "walking". Then you'd switch to whatever drill bit was necessary to complete drilling. It was useful for cases where you could not use a punch. Are there such things in the US, and if so, what are they called? i Those might be carbide PCB drills in standard 1/8" shank, various number sizes, and 82 degree cutting surface. You might be talking about HSS with split point 82 ? degrees. Martin -- Martin Eastburn, Barbara Eastburn @ home at Lion's Lair with our computer NRA LOH, NRA Life NRA Second Amendment Task Force Charter Founder |
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