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Old 10-14-2012, 04:04 PM   #1 (permalink)
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Drill bit broke off help?

Using 1/8" drill bit titanium.

I use drilling a hole in a bolt cause it is corroded in the threads and have to drill it out to tap it. Sadly while drilling the bit is broken off in it. Do I get it out some how or should I use a bigger bit or get a different bit to go through it?
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Old 10-14-2012, 07:13 PM   #2 (permalink)
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Is any of the drill bit sticking out above the screw head? If so, use a pliers and turn counter clockwise.

Another simple technique is to square off the head of the screw and just use a pliers to unscrew it.
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Old 10-16-2012, 12:45 AM   #3 (permalink)
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Try to remove the drill bit as described above.

If squaring the head of the bolt will damage the item it is fastened to try using WD40. It will help loosen the threads of the original bolt. Allow it to soak for a reasonable amount of time. I would then carefully slot the top of the bolt with a dremel, hack saw or zip cut on a grinder. Then I would use a slot screw driver to remove the bolt. The slot and screwdriver end should be as close a match as possible to help avoid stripping. You will have to apply a great deal of pressure both down and counter cloclwise to free the bolt. Be certain to anchor the piece level that the bolt is trapped in to avoid scarring it or sending it flying, lol.
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Old 10-24-2012, 03:41 AM   #4 (permalink)
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could you JB weld a allen wrench or another bolt to it and draw it out that way?
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Old 10-24-2012, 02:19 PM   #5 (permalink)
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Quote:
Originally Posted by adam45 View Post
Try to remove the drill bit as described above.

If squaring the head of the bolt will damage the item it is fastened to try using WD40. It will help loosen the threads of the original bolt. Allow it to soak for a reasonable amount of time. I would then carefully slot the top of the bolt with a dremel, hack saw or zip cut on a grinder. Then I would use a slot screw driver to remove the bolt. The slot and screwdriver end should be as close a match as possible to help avoid stripping. You will have to apply a great deal of pressure both down and counter cloclwise to free the bolt. Be certain to anchor the piece level that the bolt is trapped in to avoid scarring it or sending it flying, lol.
Motorcraft upper engine cleaner (also referenced as Tune-up carb cleaner depending on age) is also an extremely good penetrating agent. Because it comes in a can it allows you to pour it as a liquid into any depressed area and allows more contact on the metal. That being said it is not friendly to paint, anno, or o-rings.
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