Ok, I spent a happy day last week doing some carving on the xcarve with great success. I plug the xcarve back into the same pc, with the same leads (using the same com port) and as soon as the arduino connects to the pc the machine starts to noisily creep along it’s X and Z axis, breaking a bit and trying to wrench itself apart until I pulled the power. When the usb is disconnected it sits quiet with an ominous forboding but plug the usb back in and the creep continues. Am I getting interfence over the USB? How can I troubleshoot this problem?
(edit) I since noticed that the noise is because the z axis stepper motor is juddering back and forth very quickly while the x axis creeps along continuously from left to right.
also plugged in the machine to a different pc. Same problem.