I hope this is in the correct area. If not, please move as needed. I am trying to run down an issue with what I will refer to as jitter along a straight line. I am not sure if it is electrical interference or some other issue. Please see the attached picture to get an idea of what I am talking about. The line in question is along the X axis. I have the chassis all grounded and the cable going to the spindle is connected using double shielded cable and is also in a grounded flex conduit. All connections are tight as far as I can tell.