I know it is coming from the computer, because I called Gecko and they told me to unplug the printer cable and see if the problem went away.
So I did that and the movement stopped right away. They told me to reformat the hard drive and install windows again. So I did that and when I turned the servos on and ran the spindle there was no movement so I figured the problem was solved.
When I installed Mach 3 the problem was back and just as bad as before.
There has got to be something to do with Mach 3 since it only happens when Mach 3 is on.
Over 20 lines of code the machine looses .25" on all axises.
I ran the motor tuning utility and it is not accurate. I told it to move 1 inch and it moved .995. Then it adjusted the motor steps to compensate and when I jogged the axis to zero it only went to -.086.
This is all 3 axises and the likely hood that all 3 cables, servos or geckos to fail at the same time is so remote.
I know there is no noise because the servos sit still when the printer cable is unplugged. When the printer cable is plugged in, the servos start to move, when the spindle is turned on they move faster. When the printer cable is unplugged, and the spindle is turned on, the servos dont move.
So what is next?
Rob