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Farmall & IHC Tractors Discussion Forum
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Hello Funderburk1

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Tom Windsor

05-17-2007 21:07:36




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In one of the posts below, you mentioned burning out broken bolts in cast.

I have heard about it but never done it.

How exactly do you do it? Do you bore a pilot hole first?

How about a little lesson or two before I go try it. I assume the steel bolts melt before the cast?!

tw




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Armand Tatro

05-18-2007 16:46:05




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 Re: Hello Funderburk1 in reply to Tom Windsor, 05-17-2007 21:07:36  
Snap=on Tools makes an easy=out kit complete with drills, guides(centers), fluted extractors ( these do not wedge the broken bolts tighter as you try to unscrew the broken bolt), and adapters to use a deep=well socket to screw them out. They work super great!! The only thing this kit needs is left-handed drill bits as this will SOMETIMES take the broken bolt out instead of making it tighter. If you need the kit number I will get for you Sat. Armand

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funderburk1

05-18-2007 16:27:19




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 Re: Hello Funderburk1 in reply to Tom Windsor, 05-17-2007 21:07:36  
Tom, I will try to give you a call and swing by your place if you are interested.



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Janicholson

05-17-2007 21:30:32




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 Re: Hello Funderburk1 in reply to Tom Windsor, 05-17-2007 21:07:36  
Yes blowing a bolt out can happen. It is mostly a matter of heat transfer. Heating a bolt in a blind hole is not going to wirk well. If the casting is made such that the threaded hole is through the back into the air, drilling a hole about 1/2 the diameter of the bolt will allow the flame to travel the length of the bolt. cutting it must be done such that only the bolt is directly heated to any where near red heat. Then the oxygen lever is hit causing the steel of the bolt to burn. this heat (not the torch flame) continues the cutting process. Be sure to blow through the hole and not plug it up. If it gets plugged up, it will have slag inclusions that are hard to drill out. If it were mine, I would drill out the bolt with very careful alignment of the drill (jig/fixture) and centering. then keep using larger bits until I got to the tap drill size. then heat the remaining "springlike" piece of thread with the torch until it glows. Then pull them out with a needle nose and a dentil pick. JimN

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Tom Windsor

05-17-2007 21:39:06




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 Re: Hello Funderburk1 in reply to Janicholson, 05-17-2007 21:30:32  
Generally, I drill out as you describe. I have never used heat on the residue...but, next time I am going to try this and see if I can get your system to work for me.



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Janicholson

05-17-2007 21:48:05




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 Re: Hello Funderburk1 in reply to Tom Windsor, 05-17-2007 21:39:06  
I worked in a Steel hauling trailer manufacturing factory that also repaired their own as needed. We needed every method of expedient and careful removal we could find or invent. We regularly cut nuts off of U bolts with a cutting torch without damaging the threads on the bolt at all. the rust (usually causing the grief) is a thermal break, allowing little heat transfer (at those rates of heating, and comparitively) to the casting. Good evening tom, Jim

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