Originally Posted by
Dan Fritz
I noticed that your first X move goes to a negative dimension (X-10000). Is this a Mori-Seiki? Mori Seikis of that vintage had the X axis backwards from other machines, meaning that all the dimensions on the part in X were negative. It also means that G02 and G03 are reversed from the operator's perspective. Since the coordinate system is "flipped over", imagine looking UP at the part to determine "clockwise" and "counter-clockwise".
When you convert a "normal" lathe program to run on an Mori with the backwards X axis, you have to mirror all the X dimensions, swap all the G02s and G03s and also swap all the G41s and G42s (cutter comp. left and cutter comp right).
This unusual setup was due to the fact that the early Mori toolchangers were on the "backside" of the spindle, and the spindle rotated so that cutting forces were not trying to "lift" the crosslide off the ways.