First, thanks to all who contribute. I rely on this site a lot. I'm finishing my second build which is a gantry style machine. I have X and A slaved and Y is perpendicular to X&A. Mechanical homing switches are installed on all axes. Basically the gantry plate on each side contacts and opens the limit switches at the axis ends. I secured a piece of wood to the table and trimmed it so as to get a line parallel to the x-axis. I then mounted a piece of aluminum perpendicular to that. Perpendicular as close as I need, at least. I have been homing and adjusting to that by trial and error with a little algebra to aid my guesses.
I have been shimming the plates so a to cause the Y-axis to get as close to perpendicular as possible. But I was wondering, Can I use Mach3 to automatically make this adjustment? In other words,instead of physically shimming X or A by, say, .035", I would cause the machine to move either X or A by 0.035 before it sets the x-axis Machine coordinate to zero?
Thanks to all.
Mark