EDM test with Dave and Roy

We build and test a low budget EDM for burning out broken taps, bolts and making holes in hard metals. Stepper motor control is an Arduino UNO set up for gap current control. This was steel

Test with aluminum. Hex hole burned with EDM. 35 -45 volts electrode positive

Redesign with a linear actuator for ram

Arduino relay board test

Arduino relay board test. The darn  thing was doing unexpected stuff testing for a dishwasher controller. Testing the relays  confirms I have a software error and the relays do work. Think the TONE function is conflicting with the pins I was using.