My Y axis motor has done wierd things intermittantly ever since I got it. It was used, so no suprise there, but it finally gave up the ghost last night. I have a spare one and a few more on the way, so as soon as I can extract the old one I’ll be good to go, but it failed in a wierd manner so I figure I should mention what happened in case anyone else runs into the same issue and does a search.
Basically, the motor has failed in such a way that telling it to move 50mm at 100% speed results in it moving 100mm at 200% speed. I’ve pulled the Y motor and put it on the X controller, and it does the same thing on X, and the X motor works fine on the Y controller, so I know it isn’t the board. No idea what actually did fail in the motor. I’m guessing that it’s somewhere in the encoder itself, there are four wires going to the motor, maybe two of them are shorted together and doubling the voltage going to the motor now? I dunno. At any rate, it is an old motor and I’ve used it fairly hard, so it’s not even remotely close to being under warranty. Still seems like an unusual failure mode though. I’ll take it apart once I get it off the frame and see what it is actually doing.