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Screw Extractors...how to?

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Kim Hartshorn

12-31-2000 14:31:07




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Broke a machine screw and it busted off below the surface and now...for the first time...I need a screw extractor. The thing is...although there are lots of warnings and warrantees on the back of the package...there are no directions.

My guess, and I am wondering how close I am, is that you are supposed to drill a hole into the broken stud of the correct size for the extractor, chuck the extractor into the drill, run the drill in reverse and the extractor pulls its way into the hole until it bottoms out and then backs out the screw.

Please explain,

thanks

Kim Hartshorn

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Irv

01-01-2001 07:52:53




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 Re: Screw Extractors...how to? in reply to Kim Hartshorn, 12-31-2000 14:31:07  
Left handed drill bits are good. We usually drill out the hole 1/16 or 1/8 undersize of the thread dia. Often the bolt section will come out on the drill. The hard part is centering the drill and keeping it centered in the hole. If you have to use a heli coil don't worry it is stronger than a regular thread. Another solution is a "Timeset" like a helicoil but replaceable thread inserts.



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Rollo

01-01-2001 05:44:07




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 Re: Screw Extractors...how to? in reply to Kim Hartshorn, 12-31-2000 14:31:07  
I just rebuilt a JD A, and tried screw extractors two or three times. All I ever did was break the extractor off in the hole, and you can never drill through a broken screw extractor. I've had some luck with a left hand twist drill bit. Most of the time, I have to drill out the bolt and re-tap the hole. If you wnat to keep the same thread size for some reason, use heli-coils (sp?).



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Micheal

01-02-2001 15:01:59




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 Re: Re: Screw Extractors...how to? in reply to Rollo, 01-01-2001 05:44:07  
I broke an eazy out off in a 7/16ths head stud couple years ago. I got the thing out by using a round-nosed carbide cutter in a die grinder running about 6000 rpm. cut through the eazy out like a hot knife through butter!!!! then i finished off the rest of the stud with the cutter and polished up the hole with a tap. Worked very nicely! Really justified the $20 for the carbide cutter.
micheal

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Jim K

12-31-2000 16:25:23




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 Re: Screw Extractors...how to? in reply to Kim Hartshorn, 12-31-2000 14:31:07  
Nothing to explain you already got it right.
Jim P.S. I've never had much luck with extractors I just drill and retap.



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Skinner

12-31-2000 15:21:11




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 Re: Screw Extractors...how to? in reply to Kim Hartshorn, 12-31-2000 14:31:07  
There are several different types of extractors but they all basically work the same way.

If you have the square tapered extractor or the left handed, twisted, tappered extractor then Drill a hole in the bolt that will let the extractor get a good bite (from the mid-section of the extractor), tap the extractor into the hole with a hammer then use a wrench to turn it backwards to unscrew the bolt. Do not use the extractor in the drill!

Don't drill your hole so large that the extractor goes all the way through the bolt and bottoms out in the old threaded hole.

What size bolt are you removing?

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Steve from Tn

12-31-2000 15:34:39




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 Re: Re: Screw Extractors...how to? in reply to Skinner, 12-31-2000 15:21:11  
Not answering any question, but another way to extract a broken screw or bolt is by drilling the hole with left-handed drill bits. My tractor dealer kept a set of these and would loan them. I guess that the drilling if the hole heated the broken bolt enough that the reverse cutting drill bit just unscrewed it on out. I'm sure that set of drill bits was right pricey and that the regular extractor is a better way.

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BFO

12-31-2000 15:54:43




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 Re: Re: Re: Screw Extractors...how to? in reply to Steve from Tn, 12-31-2000 15:34:39  
I bought a set of these power extractors, but haven't used them yet.



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Burrhead

01-01-2001 08:58:45




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 Re: Re: Re: Re: Screw Extractors...how to? in reply to BFO, 12-31-2000 15:54:43  
Diamond Mine Supply has had that type for several years. How much do they cost now if that's not too personal to ask.

20 years ago one bit was about $20 each. They were worth a million $ if you had to have it tho.

If you are too busy to try yours out to see it work just email me a 3/8" and I'll try it out for you. Not only am I a inique know-it-all on equipment trouble shooting and family problems, I also happen to be and accomplished tool critic.

Better yet BFO, I'll just email you this continental cranshaft and you can get the flywheel threaded guide studs out for me.

All B-S aside. Happy Holidays to you and yours, and my wishes that you don't even need to use the extractors this year.

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Fred OH

01-02-2001 12:25:10




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 Re: Re: Re: Re: Re: Screw Extractors...how to? in reply to Burrhead, 01-01-2001 08:58:45  
Had a friend stop by last summer and took me to a large split John Deere with all six flywheel bolts sheared off and all about flush or less. He was pretty quick about telling me that the price was about two thou for a new one. I got a prick punch and a 16 oz ball pein hammer and took all six of 'em out with very little effort. He was so tickled, he forced me to take half a Franklin. Sometimes you get luckier than an out house rat. L8R----Fred OH

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BFO

01-01-2001 10:50:29




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 Re: Re: Re: Re: Re: Screw Extractors...how to? in reply to Burrhead, 01-01-2001 08:58:45  
Same to you Burr, but actually I was hoping you'd respond to the engine hour post on the tractor board, I left it wide open for ya ;-)
I bought those extractors just before harvest to keep in the box because they looked they would have saved a heap of aggravation. As it turned out, nuthin ever breaks when your prepared.



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Oh ya Burrhead.....

01-01-2001 11:06:29




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 Re: Re: Re: Re: Re: Re: Screw Extractors...how to? in reply to BFO, 01-01-2001 10:50:29  
cost me $75 Cnd. for the larger set.



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