[AT] EDM (Electrical Discharge Machining) Drilling on old tractor steel and iron.

James Peck jamesgpeck at hotmail.com
Sat Nov 2 08:14:46 PDT 2019


These guys are calling them tap extractors. One is shown being used on a V8 engine head.

http://waltontools.com/products/remvtap.htm
http://waltontools.com/products/extractr.htm

[szabelski at wildblue.net former tool and die shop employee] When I worked in a tool and die shop we used a tool to extract broken taps. The tool consists of a set of fingers that look like small Allen wrenches and a handle that the fingers go into. You slide the fingers down into the tap flutes and then into the handle. Then you tighten a collar on the handle and it secures the fingers in place . Then it’s just a matter to turning the handle to remove the tap. Works great as long as the tap hasn’t shattered into pieces, then you have to sit there and pick out the pieces (usually just a few pieces near the top of the hole) one at a time until you can get the tool to work.

When this wouldn’t work, the tap would be burned out. This was usually only done when the tap had broken into a bunch of little pieces that were all jammed up in the hole.

Don’t remember what the tool is actually called, but you should be able to search the internet to find it.


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