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Seized Screws - Impact driver fail

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Spitfire:
I use a home made T bar, place it on the offending screw give it a sharp rap with a hammer and they tend to loosen off.

Cheers

Dennis

z1100r:

I would grind whats left of screw flush with case, centre dot it and drill with  5mm drill. I would then heat it with a heat gun/blow torch until its real hot and let it cool down, heat it again and try an easy-out. I have hammered  small torx bits into the 5mm hole in the past. This sounds well stuck though and drilling out and helicoiling maybe  your only option.

matthewmosse:
paste a big gob of weld on there with arc (stick) welder, whack on the mole grips and twist, - rarely fails but I have an exhaust stud on  my wifes 250 nighthawk that I've had up to white hot with the oxy acetalene, welded a 6mm sockett directly on there (one off a 5 quid / 200 pice sockett set, not a good one!) and still it will not budge, for this one I'm thinking of just welding some treaded bar to the broken off / protrudig stud and filing it to the correct dimentions.

StPeter:
Thanks for your suggestions.
Bryan - I had forgotten that detail about the screw heads -  it's been a long time since I last did this stuff and my brain's filled up in the meantime. Thanks for the reminder.
I've managed to recut the thread on the stud and get an M6 nut on it. Stick welder will get an outing tomorrow (when I repair my mask - who left the batteries in?). That should get some serious heat into the threads and give me a flat-sided "gob of weld". It's marinating overnight in Plusgas at the moment!
If that fails, it's out with the drill bits.

kifer:
Don't forget to strike up on some scrap first you know what these welders are like. Try a slight tightening pressure first was always told that as a lowly apprentice but it seems to work. Good luck Tom.

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