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I'm screwed now...

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Kestrel CT

03-05-2007 05:17:07




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Against my better judgement and advice, I went and tried to extract a sheared off stud with srew extractor from Sears. After driling a nice deep hole, I inserted one of those reverse extractors using a hand die and gently began to turn. It immediately snapped off flush in the stud head.

Trying to drill through that darn thing was a waste of several more bits. The stud is on a rear axle that is presently off the tractor.

Should the whole thing be taken to a machine shop ? Can they perform any magic there ? These bolts hold the PTO housing against the rear axle so it needs to be a tight fit. Thank guys.

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banjo

03-19-2007 00:10:29




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 Re: I'm screwed now... in reply to Kestrel CT, 03-05-2007 05:17:07  
I have heard of some using carbide masonry bits to drill out extractors.



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KEB

03-05-2007 21:02:13




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 Re: I'm screwed now... in reply to Kestrel CT, 03-05-2007 05:17:07  
I've had a LOT better luck with left hand drill bits than with EZ outs & similar things - in fact, I can't remember every actually getting a broken bolt out with an extractor. Seems like most of the time once the left hand bit catches it'll spin the bolt out. Even if it doesn't, you haven't lost anything drilling the hole with a left hand bit instead of a right hand one.

I got a set at harbor fright a while back, not the best quality in the world but have worked the few time I needed them.

Keith

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michael price

03-05-2007 20:18:42




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 Re: I'm screwed now... in reply to Kestrel CT, 03-05-2007 05:17:07  
You may want to get some reverse rotatio drill bits. Theres been a time or 2 when I was drilling out a bolt for a ez out or to tap it out and I seen the bolt turn so if I had a reverse rotation drill bit I would have been in business. I dont have a set but would like to get some for when the time comes.



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Lawmar

03-05-2007 17:41:15




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 Re: I'm screwed now... in reply to Kestrel CT, 03-05-2007 05:17:07  
Rusty Farmall's advice is you best bet. Weld the nut on and then let it cool. It seems like with cast iron if you heat it and let it cool and then heat it again it works better. Onlarger bolts Ihave succesfully tapped a left hand threaded smaller bolt into it and then heated and turned it right out. Also, if it is cast iron and you have someone who really knows how to use a oxy acetylene torch you can blow it out of the hole without hurting the cast however you usually ruin a torch tip doing this and you have to really know how to use a torch.

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Kestrel CT

03-05-2007 12:46:47




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 Re: I'm screwed now... in reply to Kestrel CT, 03-05-2007 05:17:07  
I sort of lucked out, for the moment anyway. I found a small family run tool and tie maker about 15 minutes away who said he could help. I just dropped off the whole rear axle and he'll use his EDM machine only if he can't coax it out first with traditional drills and extractors.

His best advice of the day was to make sure whenever beginning to drill that you find the exact center of the bolt, otherwise it'll make a real mess of things.

He really only uses extractors when someone over tightens something and snaps off the head and it's not rusted in.

I may pick up a set of those good extractors and just practice on some old relic for when it happens again, which it will. I don't know of anything more frustrating and time consuming than dealing with these broken fasteners.

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old

03-05-2007 08:16:28




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 Re: I'm screwed now... in reply to Kestrel CT, 03-05-2007 05:17:07  
I've had very bad luck with the long type extractors but I now have a high priced set of them and they wrok very good and I have yet to brake on off. They are only about an inch long and have a fast twist to them. You also don't use a hammer on them like you do the long type. All depends on how good the ones you have are as to how well they work.

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deere old fool

03-05-2007 07:43:12




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 Re: I'm screwed now... in reply to Kestrel CT, 03-05-2007 05:17:07  
It might have been that you got the wrong style of extractor for the job. Using a little heat all around the part you want to get out is always adviseable. I'm trying to figure out how Rusty Farmall has ever removed a stud or bolt that broke flush, without using an extractor of some kind!



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RustyFarmall

03-05-2007 08:21:42




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 Re: I'm screwed now... in reply to deere old fool, 03-05-2007 07:43:12  
I weld a nut to the top. Even if the stud is broken off slightly below the surface, it can still be done. If the bolt is in a recessed area where you just cannot weld, then I drill it out and re-tap the threads. Much easier to just drill it out than it is to try and remove that broken EZ-out.



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souNdguy

03-05-2007 06:28:19




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 Re: I'm screwed now... in reply to Kestrel CT, 03-05-2007 05:17:07  
Unless you up for more hair raising work.. I'd head to the machinist.

Ya got a few possibilities.

Make a template of metal with a hole in it just big enough to go around te stud to act as a shield.. now.. if you have oxy-acet, and a piercing tip.. start to blow a hole right where the extractor is... you may be able to burn it out.. or at least ruin it's temper.

Other way is to try to set a nut on it, and weld thru the center of the nut to the extractor and then reverse it out.. ( reverse of the extraction fluting.. IE no load.. )

Soundguy

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RustyFarmall

03-05-2007 06:16:20




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 Re: I'm screwed now... in reply to Kestrel CT, 03-05-2007 05:17:07  
Screw wxtractors, E-Z outs, what ever you want to call them. They work best by leaving them on the shelf at the store. I'm sure the guy that invented those things is laughing all the way to the bank.



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clinton

03-05-2007 06:04:36




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 Re: I'm screwed now... in reply to Kestrel CT, 03-05-2007 05:17:07  
Screw extractors are brittle, you can usally break them into pieces with a punch and hammer, make sure your wearing saftey glasses as the chunks will fly out.



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GeneMO

03-05-2007 09:33:23




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 Re: I'm screwed now... in reply to clinton, 03-05-2007 06:04:36  
If you have any part of the stud/screw extractor sticking out, or even if it is flush, you could still put a nut over it and weld through the center of the nut. The heat will help loosen it and then real carefully put a box end on it and good luck.


Gene



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