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One of our group moderators, DrMico60, has built and then improved an EDM suitable for tap removal, see:


He provides enough info to allow building a modest cost unit which would remove broken taps or make holes in hard material like tool steel.

For tap removal a hollow eroding tool just large enough to break into the flutes of the tap will reduce the amount of? material eroded, speeding up the process.?

John

Looks great

Dave?

Good stuff.

There is a huge amount of technology out there.

I'm still in the age of simple machining and napkin design.? ?No edm, CAD, mill power feed, CNC, etc.? ?8^)
--
Lone Tree, Colorado? ?USA

EDM maybe very old aka { Electrical discharge machining spark erosion }
The erosive effect of electrical discharges was first noted in 1770 by English physicist Joseph Priestley.

EDM was for machining around the 1940's . Before the 1940's they used sand / grit and ground down the part.??

I do not know about tap removal the first ad I found was in 1950's. It is downloaded section.??

Dave?