" Jim Sehr" wrote in message
...
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



Thanks to everyone for the suggestions. Some of which I've not tried in the
past. It's amazing how many good ideas there are out there!

Thanks Jim, for the reference to the Machinery's Handbook. Duh, I guess I
should have thought to look there first. That's the specific info that I
was looking for.

Thanks again to all.

John



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