I broke a tap today. There was not enough protruding for me to get a grip and twist it out. I thought I would anneal the tap in situ and drill it out. So I heated it red hot with my TIG torch and let it air cool.
When I tried to drill, I found it was still way hard and I abandoned the idea of drilling out the broken tap. I had the flexability to drill and tap beside the original hole so there was really no great loss. But, what if I really needed that particular spot?
Would I have had better luck drilling had I cooled the part more slowly (e.g., buried the part in a bucket of ash)?
Is my thinking nuts or is this a way to get at an offending broken tap?
TIA, David Todtman