Look in the Machinery's Handbook under Removing a broken tap. One part
nitric acid and 5 parts water.
Jim
"John" wrote in message
...
I'm trying to determine which of the acids we used to use, in the old
days, to disintegrate broken taps or drills. I remember when that was
done occasionally, but don't remember which acid was used. I have a
friend who has a broken drill in cast iron and I thought this might be a
possibility before we start chopping at it with carbide tools and make
matters worse. It might at least loosen it up enough to remove by hand.
It's a 1/8" dia. drill and not in too deep, about 3/16", but it's bound
pretty tight.

Thanks
John



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