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Broken stud

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mark

01-01-2001 08:56:17




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I wrote that I used a carbon drill bit ..I meant to say I bought a very expensive 1/8th inch COLBOLT DRILL..it did not even make a scratch in it ..and as far as getting a left hand drill???what is the difference ??seem's like it does not matter to me which way you drill into metal???




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william l. brown

01-04-2001 11:42:32




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 Re: broken stud in reply to mark, 01-01-2001 08:56:17  
Sir, put a hex nut the same size as the stud over
the broken part, then weld inside the nut.
you are welding the nut to the broken stud.
after it cools for a couple of minutes, put
a wrench on it and see if you can unscrew it.
william



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John in Abq

01-03-2001 10:17:45




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 Re: broken stud in reply to mark, 01-01-2001 08:56:17  
Heres the procedure I use on the really stubborn ones.

1. I use a carbide burr in either a Dremel tool or a die grinder, depending on the bolt size. Grind the bolt flat and just below the surrounding surface.

2. If the bolt is somewhat in the vertical position. I use modeling clay to make a dike about 1/4" high around the bolt. I then fill the dike with PB Blaster and let it soak, the longer the better.

3. Clean the clay and PB off.

4. I then take my tool engraver and work it counterclock wise around the edges of the bolt for 5-10 minutes.

5. Next I start drilling with the left hand bit to make the hole for the extractor. Usually the bolt comes out at this point.

6. Finally I use a spiral bolt extractor.

I hardly ever get to step 6. The combination of the PB Blaster and the vibrations from the engraver usually let the drill spin the bolt right out.

Sort of involved procedure, but it works for me.

HTH, John

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jimmyzz

01-02-2001 23:27:15




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 Re: broken stud in reply to mark, 01-01-2001 08:56:17  
what size is broken stud?



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Fred OH

01-02-2001 11:26:43




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 Re: broken stud in reply to mark, 01-01-2001 08:56:17  
Mark, I will make a comment that sometimes when you drill out a bolt and the drill is dull, it will work harden the metal that you're drilling and the drill may or may not make a squealing sound. When you look at it, it will look real shiny. When this happens, the only way to remedy it is either anneal the metal (heat red and cool slowly) or to get under the hard spot with a carbide drill. Then if you are on center, it doesn't matter if you use right or left handed drills, although once in a while one will screw out using a lefty as the fellows describe. Just don't count on it. You drill to the root diameter of the bolt and the thread will screw out just like a spring with the use of a scriber or awl. It usually requires a drill press or a mill to get the accuracy required though. Also if the bolt is hard and can't be annealed and you have to use a carbide tipped drill, you'd be best to make a guide for it. (A piece of cold or hot rolled steel to guide the drill on center) L8R----Fred OH

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Steve U.S. Alloys

01-02-2001 06:12:02




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 Re: broken stud in reply to mark, 01-01-2001 08:56:17  
We have been selling extractor sets that come with left hand bits for quite some time. They really are head and shoulders above the right hand twist drills when utilized for the intended purpose. Lots of people seem to prefer the set with the spiral shaped extractor to the square one. Many professionals have told us that it is common for the bit to spin the broken stud/bolt out before the extractor is needed. There are big differences between brands of drills just as there are often big differences between brands of welding alloys and so many other things. Of the seemingly few items still manufactured in the USA, our American drill bits are highly respected for their level of quality world wide. There are several good brands. Expect to pay more for these as you would for any good tool. The one brand we have chosen for our company to represent is Norseman which is manufactured in Minnesota. I believe the cost for them is $80.00US.

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mark

01-01-2001 09:42:30




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 Re: broken stud in reply to mark, 01-01-2001 08:56:17  
ok so have we agreed that a left hand drill is NO different that a Right hand drill, to drill the {pilot hole} ? and I hope people read this so they don't run out and buy a LEFT HAND DRILL thinking it cut's better ..so then the only thing I have learned is that I need to look at the make and make sure I get a "hanson or triumph" colbolt drill.I bought what the local engine rebuilder downtown suggested ..and I will take them back...thank you guy's for the help ..maybe I can help you sometime..I have had over 125 tractors and have taken out many stud's ..never a bolt of this temper..

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Dean

01-01-2001 12:50:58




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 Re: Re: broken stud in reply to mark, 01-01-2001 09:42:30  
Go out and buy an appropriate size CARBIDE drill bit (yes, the same kind you use for masonry). The left hand trick DOES work, in fact, the stud will almost always come out without the need to use a screw extractor.



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CJ

01-01-2001 09:18:22




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 Re: broken stud in reply to mark, 01-01-2001 08:56:17  
I have bought colbalt bits that were expensive but not very good. (Vermont American bits I have not had much luck with) Triumph or Hansons are what I prefer. You can often tell by looking at and feeling the cutting edge. It should be precise and well ground. Not plated looking. Left hand bits are the way to go. But if you need to drill a pilot hole before you drill to your easy out size it doesn't matter left or right so save a few bucks on the small bits.

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Burrhead

01-01-2001 09:03:30




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 Re: broken stud in reply to mark, 01-01-2001 08:56:17  
The left hand bit is the way to go. I did'nt believe it either the 1st time I tried it.

Sometimes with a left handed bit you won't even need a easy out extractor. The bit will sometimes run the bolt out when it gets down into it and can get a good bite on the bolt, that saves a ton of work for you, plus the threads will still be in very good shape since the bolt won't swell and strip them out of the block on it's way out.

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Steve from Tn

01-01-2001 09:12:42




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 Re: Re: broken stud in reply to Burrhead, 01-01-2001 09:03:30  
Thanks Burrhead, I didn't believe it either when I was told about the backwards cutting drill bits. It is amazing what we can learn if we just listen.



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