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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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On topic drilling question...
Drilling into the end of a large threaded rod, centered, punched and
drilled starting at 1/8" worked up to 3/8". 3/8" is about 1/4 of the way into the hole and quit cutting, Either I hit a hard spot in the steel, or it got work hardened, I was using coolant, but not flood. Swapped to a new and sharp HSS bit, no joy at all. Suggestions? I can: 1. Try a masonry bit, 3/8 is something I have in the shop. 2. Heat it with a plumbers torch and see if I can temper the hole. 3. Go get a TiN or Cobalt bit... I need to finish the 3/8 and then drill it to 13/32nds, then tap, so I'm close, but I'm worried about the tap and the hard spot too. Any help would be great! Stuart |
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