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Broken drill bit removal

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Gary Sanders

04-30-2002 08:19:00

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This seems to be my week for bad luck. I was given a John Deere 111 riding mower with a Briggs engine that runs. That is the good news. The bad news started when I began to give it the TLC that it so obviously needed. The muffler was missing and the bolts rusted and broken off in the block. Tying to remove the broken bolts with vise grips did not work. I ground the bolts flat and starting drilling. The first one went okay until I got close to finishing and then broke off the 5/16" UNC tap in the hole. Not to worry, the Walton tap extractors did their job and that hole is now ready for a helicoil. The second bolt now has a 3/32" HSS drill broken off in it. No luck with removing the piece with a magnet. I think my next move is to drill the broken bit out. My question is what is my best option for doing so. Carbide?? Cobolt?? All suggestions and comments are appreciated.

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Vincent

05-03-2002 19:50:52

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Re: broken drill bit removal in reply to Gary Sanders, 04-30-2002 08:19:00

GO TO Link Now if that didn't get copied correctly go to the homeshopmachinist.net then click on the BBS and then go to the forom Third hand and open the articel on broken taps.

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T_Bone

04-30-2002 11:33:08

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Re: broken drill bit removal in reply to Gary Sanders, 04-30-2002 08:19:00

Hi Gary,

I like using a center punch. It works better or harder metals, ie; extractors, but I have used them on HSS bits. It usually smears the bit in the hole in large chunks rather to shatter like an extractor.

Problem is you have to run a good drift pin or center punch for a 3/32" hole unless you make your own punch.

T_Bone

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Mark Kw

04-30-2002 10:18:39

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Re: broken drill bit removal in reply to Gary Sanders, 04-30-2002 08:19:00

If you have a stick welder, you could try sticking a stick electrode to it then work it out with that. To get the stick stuck, clean the flux coating off it and it should just spot weld to the bit. Have to be careful not to let weld flow onto the bolt or housing. If you have a wire feeder, you can turn the voltage / wire speed down and do little tack drops to build up a shaft on it and work on that as above.

I have yet to find a trick that works every time yet. Not bad if you got a decent size bit to work with like 1/2" or larger, you can sometimes get a pick along side it and work it out that way. Smaller than 3/8" bits are a cross no matter what you do. If it's possible, you can try putting a small amount of heat on the housing, not more than say 350F. This will sometimes expand the hole just enough to loosen the bit in the hole and allow you to get it out with a pick, magnet or piece of hard wire like solid mig wire.

Good luck!

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