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Tool Talk Discussion Forum

oops, busted thread tapper

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wilman

01-21-2006 16:01:14




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I am working on a old 943JD running gear. Was cleaning out some grease zerts with a thread tapper (a cheaper foreign made one). Ran it in until it hit the end of the threads, went to back it out and busted it off flush with the casing. Now what? Don't think a drill bit will drill thru it. Am open to suggestions or ideas.

I should mention that I probably can live with out that grease zert. It only supplies grease to about a 1 1/2 inches of a 4 inch bolt that the tung of the wagon swivels on. Figure if I grease the heck out of the bolt before putting it thru and then take it out and grease it once a year, it should be ok. Don't plan on using the wagon for a whole lot other than shows.

Thanks

Wil

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Fred Martin

01-23-2006 14:18:12




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 Re: oops, busted thread tapper in reply to wilman, 01-21-2006 16:01:14  
You guys telling someone to hit a hardened piece of steel with a hardened punch should probably add that they wear safety glasses and heavy gloves...maybe even wrap a rag around the part too....cause those little metal chunks that fly off are going at the speed of light. Not complaining...just remember to be safe too. Fred OH



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d-fishman

01-22-2006 11:02:36




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 Re: oops, busted thread tapper in reply to wilman, 01-21-2006 16:01:14  
If it has broken off flush and you have a welder handy (mig works really well) set a small nut over the hole and tap run the mig wire thru nut and plug weld nut to tap let cool and try turning out with a wrench. This might take a couple of tries getting the nut welded secure to the tap but you would be suprised how easy the tap comes out. Also try heating outside area with torch (expands metal away from tap) Good luck
I have had to use this method a few times and have had success every time
Dave

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Kelvin

01-21-2006 19:17:35




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 Re: oops, busted thread tapper in reply to wilman, 01-21-2006 16:01:14  
I got one out once by slipping some small welding rods in all the notches, stuck a smaller bolt in the center and clamped the whole mess together with a little hose clamp.
Then I was able to turn the whole mess out, tap and all with vise grips.



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Mr. Jeffries

01-21-2006 18:50:24




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 Re: oops, busted thread tapper in reply to wilman, 01-21-2006 16:01:14  
third party image

Take a chisel and hit on the outside edge of the tap in a counter-clockwise direction....If it's not bound too tightly, it'll back itself out...
We call that method the Polish Extractor....hehee.
I've got several broken bolts off using that, it should work in your application as well...

TFB

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T_Bone

01-21-2006 17:28:33




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 Re: oops, busted thread tapper in reply to wilman, 01-21-2006 16:01:14  
Hi Wil,

Use a center punch and hit the tap a few times and it'll shatter the tap then you can dig out the pieces.

T_Bone



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Redd

01-21-2006 17:15:10




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 Re: oops, busted thread tapper in reply to wilman, 01-21-2006 16:01:14  
We have tap extractors at work that have four little rods that slide into the grooves of the tap so you can screw it out. Problem is they're expensive and one size fits only that size tap. I get a lot of broken bolts out by holding a nut up against the broke end and welding in the hole until its filled and screwing out. The heat from the weld loosens up the bolt. I've never tried it on a tap. It has to be broken flush or you'll weld the threads.

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ryan from WI

01-21-2006 16:12:20




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 Re: oops, busted thread tapper in reply to wilman, 01-21-2006 16:01:14  
try welding something on that broken tap and then try to get out by turing it.



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