I had the head of a bolt break off when removing a valve cover on my tractor. I tried to used an extractor:
Regards
I had the head of a bolt break off when removing a valve cover on my tractor. I tried to used an extractor:
Regards
IMHO those "power extractors" don't work worth s**te on rusted in bolts (as you already demonstrated). I think their principle usefullness is for removing threaded fasteners when you've buggered up the head of the fastener like a rounded out Phillips' head fastener recess.
Good luck,
Jeff
I am a welder of 24 years. If the extractor is very hard, you may be able to shatter it with a cold chisel and a hammer and pull the pieces out. If it won't shatter. I suggest taking a torch to it and anneal (soften) the extractor by heating red hot and the allowing to cool very slowly. Annealing the extractor will soften the extractor possibly enough to drill out. Use a damned good quality drill bit ...something that contains a cobalt alloy......Jim
Carbide
I was helping a guy that wrung off a bolt head on a boiler and the same thing happened to him. He broke 6 drill bits try to get that extractor out. If I remember correctly, he flattened it out and then cut a notch (like a screw head) with a Dremmel tool and he used a big screwdriver on it. The screwdriver broke and then he took another screwdriver and worked it out with that and a hammer. I remember it taking a couple hours......
You probably can't drill it yourself, but a locksmith might be able to. The broken extractor has left-handed threads, so if the cobalt bit gets a good bite (and doesn't break) it may come loose in one piece.
Bob
Thanx for all your replies. That sucker just is not coming out. I'm taking the head off and having someone else see if they can do something with it.
How can I prevent this from happening again? Is there anything that can be applyed to the bolt? I assume the extreme heat from the head had something to do with the problem.
Regards
If you go to rec.crafts.metalworking they are a cooperative bunch when it comes to helping out anything to do with metal. You could also do a google search in that group as I recall the question has come up several times in the recent past.
broken bolts are a bitch, then to break off a hardened steel extractor is a real bitch (WTF they call them EZ-Outs, I'll never understand)
IMHO, your only recourse is to use a die grinder, a small carbide bit, and a lot of patience.......or take it to a machine shop
Removing broken bolts is an art
Antiseize compound may help in the future. If you come across this again, heating the fastener with a torch before attempting to remove it can help it come out w/o difficulty.
I agree about using either a helicoil or tapping to the next large size.
Dan
Lex wrote:
Just in case this ever comes up again, there are left handed twist drills available that are worth their weight in platinum. Snap-on and Matco, and mac all sell them. All of the noted tool guys in my area seem to carry the backward bits on their truck.............Like I said, well worth the price of whatever you have to pay for them.
As you drill out whatever bolt in reverse, it heats up the bolt, and sometimes the bit will "grab" the material and just unscrew the threaded piece and in a fraction of the time it takes to break off and remove the trusty old E-Z out tool.
I know this is of no help at this point, but I feel like it is a worthy thing to mention for those who read the group often.
Thanks for listening/reading.
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Your best bet is to use an EDM (electro-discharge machine) to burn it out without harming the surrounding material.
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