i got a chinese 60w c02 laser not too long ago, set up beam alignment and focus, and it's working as expected, but engraving double. i thought it may have been a beam alignment issue (my tube is slightly out of alignment and not adjustable unless i get some new mounts) but i've gotten the beam centered pretty well. then i thought it might be a mechanical issue, but when i slowed down the gantry it still did it.
i had a concern though. when i unboxed it and tried to power it on, nothing happened. when i took the panel off where the electronics are, i noticed the back of the AC inlet plug had wires coming from ground, and two more on the left post. I thought maybe there was supposed to be a wire on each one, so i put one wire that was on the left post on the right.
well the laser still didn't power on, but it was because the emergency stop was pushed in and turned. when i released it, everything powered on. I didn't change the AC inlet wires back.
so, is it possible that having an AC wire on the left and right post, instead of having them both on the left post as they were originally, is causing this issue? like, causing a double polarity thing (please excuse my lack of electronics experience). as i said, everything else is working as expected. if pics would help, i can take some when i get home.