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Tool Talk Discussion Forum

Drilling heat treated studs.

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J Schwiebert

04-19-2006 06:34:59




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What is the best way to drill hardened like a file will not touch broken studs?




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Fred Martin

04-21-2006 05:40:31




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 Re: Drilling heat treated studs. in reply to J Schwiebert, 04-19-2006 06:34:59  
You can"t run a masonry type drill in hardened steel real fast cause it will melt the silver solder that holds the carbide tip on...and you can then throw it away. Best to use a moderate speed and coolant ...even if it"s water. Sometimes you can heat the hardened stud with a torch till it"s good and red and let it cool slowly and it will anneal the hardness out of it and then be drillable. Your mileage will not vary much from this. Fred OH

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Tim Casbolt

04-19-2006 17:59:14




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 Re: Drilling heat treated studs. in reply to J Schwiebert, 04-19-2006 06:34:59  
Most hardened studs are case hardened, which means the core is still pretty machineable. Depending on how it's sitting, you can sometimes flatten the end with a grinder and drill for an ez out or slot for a screwdriver.



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J Schwiebert

04-19-2006 18:33:38




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 Re: Drilling heat treated studs. in reply to Tim Casbolt, 04-19-2006 17:59:14  
Not his one. I have been that route before too.



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Don-Wi

04-19-2006 21:44:23




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 Re: Drilling heat treated studs. in reply to J Schwiebert, 04-19-2006 18:33:38  
I suggest using a carbide tipped masonry bit. Same carbide cutting tip, but easier to find and a little cheaper. It doesn't have to go smoke'em fast, but if it's slow you gotta have steady preasure on it, preferably in a good drill press or even better a bridgeport or similar mill.

That's if you Have to drill it. What I always try first is to weld a nut to it w/ a wire feed and see if I can't turn it out. Usually works, sometimes takes a couple tries to get good penetration into the stud/bolt.
Good luck!!!
Donovan from Wisconsin

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JT

04-19-2006 17:15:33




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 Re: Drilling heat treated studs. in reply to J Schwiebert, 04-19-2006 06:34:59  
A carbide drill bit in the fastest speed machine you can find. I put a carbide bit in an air die grinder, and it drilled it, but was it creating a lot of heat.



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ScottP

04-19-2006 09:16:18




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 Re: Drilling heat treated studs. in reply to J Schwiebert, 04-19-2006 06:34:59  
Use a carbide dill bit. Works every time.



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Chris(WA)

04-19-2006 06:49:55




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 Re: Drilling heat treated studs. in reply to J Schwiebert, 04-19-2006 06:34:59  
With a torch and a steady hand. A bolt that hard is so high carbon that it will burn away much sooner than the surrounding material. So just go in, heat it, burn it and get away.



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