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Restoration & Repair Tips Board

need help--busted off screw extractor.

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Brian in NY

10-27-2004 08:09:04




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Using a screw type screw extractor in a 5/8ths bolt.....drilled into the bolt real nice and tapped the extractor in. Started turning a little bit, back and forth, soaked with PB blaster....not being hard on the tool.
Didn't seem like it was biting just right so I tapped er again and she snapped off. Problem is, now my drill won't make a dent in the busted off extractor cause it is so dern hard. I am using a high quality titanium bit that is nice and sharp. Any ideas on how to tackle this problem? Thanks in advance!

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Robert E. Smith

10-28-2004 17:45:14




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 Re: need help--busted off screw extractor. in reply to Brian in NY, 10-27-2004 08:09:04  
Have chipped them out with a good quality center punch! done the same with broken taps! But must be a quality punch! Cheap soft one won't work here! I use a Snap On punch, they make the best punches hands down! but you pay the price for them also! and this job will beat them up pretty bad also!
What I do is blow out the hole the extractor is in with air hose to get rid of any loose tiny chips!
Then take a good look at the extractor! if there is any little chips of the extractor around the edge of the tool chip these out first!
Blow out the hole often!
Sometimes once you get the chips around the edges out you can take your punch and back the extractor loose from the bolt (remember it only grips in one direction)Then with a little luck you may be able to remove it with a magnet. Have also used a needle tip on a grease gun,sliped it down beside extractor (that is loose in hole)and pumped it out with the hyd. force of the grease.
When this wont work you will have to just keep chipping at it! Sharping you punch! Chipping at it remembering to keep hole blown out as you do!
This is a time consuming tedious job! But can be done!
Just a couple of helpfull hints!
First and formost! These little chips are flying shrapnel!!! Long slevees and saftey glasses or better yet! Faceshield is a MUST HAVE!!!
Keep you punch sharp use a dead blow hammer if you have one (helps transfer more force to shatter brittle steel that extractor is made of) And above all be patience! Been a mantinance man in a steel mill for 27 years and have done this on more than one occasion! It will work! at least 99 percent of the time. Helps to if extractor's not real deep into bolt! that always makes the job tougher!
Good Luck hope this is of some help!
Bob

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T_Bone

10-28-2004 18:20:53




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 Re: need help--busted off screw extractor. in reply to Robert E. Smith, 10-28-2004 17:45:14  
Hi Brian,

I have used the method Bob discribed alot and it works well.

If you need to drill anything harden, first get a piece of 1/4" copper clad carbon rod (welding shop supply) then peal back the CU about 3/4" then sharpen the carbon to a point.

Attach the carbon rod to a 6v or 12v battery with the carbon rod on the positive lead, then stick the carbon the the area to be drilled, let heat until a dull red, disconnect the battery, let cool, then drill with a HSS bit.

This will soften the metal so it can be drilled.

T_Bone

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rustyfarmall

10-28-2004 04:53:17




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 Re: need help--busted off screw extractor. in reply to Brian in NY, 10-27-2004 08:09:04  
I have seen that very same thing happen one tiime too often. I tossed all of my screw extractors into the scrap iron container.



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TimV

10-27-2004 18:50:52




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 Re: need help--busted off screw extractor. in reply to Brian in NY, 10-27-2004 08:09:04  
Brian: The easiest way is to try to weld a nut to the top and turn the whole assembly out. Another more expensive proposition is to take the assembly (assuming it's not the oil pan on a dump truck engine or something similar...) to a well-equipped machine shop and have them burn it out with an EDM. This, in fact, was what EDM's were originally invented to do--burn out broken-off studs and bolts. They've came a long way since then, but they will still work for this if no other way does.

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