When using a sinker edm to remove a broken bolt/drill etc.. How can you tell when you have gotten past the bottom of the broken Bolt, tap or drill bit? Does the voltage/amperage change? Or are there any indications?
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If it is a thru hole, you should see a change in voltage and flushing. If you have a blind hole, I would still watch for a change in voltage and flushing but you will have to pay closer attention to your depth and kinda just peck away at it.