JFYI Nick, I have a BX verb for box, and is working sweetly, aside from pole slip in the motors due to binding in the Y slide leadscrew. But this is a mechanical issue and the total matmatical error from start to finish has been +- 1 from the beginning coordinate. Not too bad if not allowed to propagate, and equates to only .05 thousandth of an inch on the table @ a scaling factor of 1. I really need to get the GUI written to a reasonable operating level, entering signed hex values is getting to exceed annoying when using the serial monitor as a interface.