Originally Posted by skipmac
Lots of tricks you can try to remove a broken bolt. The best one to use will depend on how the bolt is broken, what material (stainless bolt in aluminum
bolt in steel
, or what?) if there is any part sticking out, how much access you have to the bolt and especially how stuck it is in the hole. A lot of the techniques listed for removing a broken tap will work for a broken bolt.
One I would not try is using an EZ Out. I'm guessing you are not in the US so may not know that brand name. An EZ Out looks like a tapered drill bit with reversed threads. You drill a hole in the broken bolt and twist in the EZ Out. Since the threads are reversed, you twist the EZ Out counter clockwise and in theory that removes the bolt. In practice what usually happens is the EZ Out breaks and you have a worse problem.
Maybe give us more details on the broken bolt and we can suggest the best trick to try.
We have bought a portable edm machine, and have removed one broken tap successfully, and we are trying to remove the other two broken taps now.