if you are really in a jam and need to get something out, find someone locally that has a Wire EDM Machine.
They most likely will also have what is called an EDM DRILL.
The service won't be free, but if the part is worth saving....
Need to remove a broken tap in cast iron
- Bill Shields
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Re: Need to remove a broken tap in cast iron
Too many things going on to bother listing them.
Re: Need to remove a broken tap in cast iron
A tap extractor can work if the tap is not bound too tight in the hole. If it is, a few heavy hammer blows on a suitable punch will sometimes free it up enough for the extractor to do the job.
Don Young