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Tool Talk Discussion Forum

Broken Bolt

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DiggerDave

02-28-2004 17:01:22




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Got a 5/8" bolt broken off about 1/4" below the surface of a casting . Probrobly Grade 8 my drills won't scratch it. Any Ideas????




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Bernie in MA

03-01-2004 17:32:58




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 Re: Broken Bolt in reply to DiggerDave, 02-28-2004 17:01:22  
A friend of mine had a 5/16 bolt break off that held an alternator bracket on the front of the head on a car. It was down inside about 1/8". He built up the end usind a 110V wire feeder so it was sticking out, hung a flat washer on it and welded it, and welded a nut to the washer. It screwed right out with a wrench.



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Wayne

02-28-2004 19:55:39




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 Re: Broken Bolt in reply to DiggerDave, 02-28-2004 17:01:22  
If it's a grade 8 you need to get you a good carbide bit to drill it out. Short of doing that if you take a small welding tip on your torch and heat put the point of the flame on the bolt and heat it to a chery red and let it cool slowly it should soften it enough to drill easier.



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GG

02-28-2004 18:12:10




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 Re: Broken Bolt in reply to DiggerDave, 02-28-2004 17:01:22  
Can you move the bolt with a small punch and hammer? If so, and you cannot work the bolt out, try cutting a groove with a small chisel. Grind the point sharp and about 40 thousands or so up from the point, have both sides flat. These flats will allow a screw driver to grip. It may take several sharpenings to get the groove deep enough. The drill bit that is supplied with some screw extractor will work on this type bolt. Start with a small dril bit and go up. If the above fails, weld a small pipe to the screw, cool it and work it out SLOW!!!

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john niolon

02-28-2004 17:29:50




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 Re: Broken Bolt in reply to DiggerDave, 02-28-2004 17:01:22  
digger,

check with a welding supply house... there is a welding rod that you just stick in the hole and start filling the hole with weld... once you get it above the surface you can weld on another piece of metal or another bolt to turn it out with... The flux on the rod is special and keeps the weld from sticking to the base metal and it won't screw up the threads... I've seen this demonstrated, but can't for the life of me remember the name of the rod or company that makes it... if your local weld guy says you're crazy, check with a few industrial supply houses...

john

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