So I've just started back into the most recent version of Mastercam after using VISI for a number of years. So here's my current stumbling block it appears that when I post a G-code program that things are working properly. The control see's the program it even shows that the comp is on the correct side (right in this case) and displays a tool path that looks about right. BUT when the tool comes in to make a cut (only a finish pass in this case) the displayed x value is much smaller than the programmed one and indeed it will cut on the small side >.< Anyone have any suggestions? I've tried flipping the comp to the other side going through touch off and tool definition a number of times all with the same results. Here's the code in question: % N100 G96 S400 G99 N110 T03 M6 N120 G42 G0 X.2995 Z.0625 N130 G99 G1 Z-.0375 F.003 N140 X.303 Z-.0385 F.003 N150 G2 X.318 Z-.054 I.0120 K-.0155 F.003 N160 G2 X.31 Z-.066 I.0195 K.0000 F.003 N170 G2 X.3055 Z-.0685 I.0155 K.0120 F.003 N180 G1 X.3065 Z-.0785 F.003 N190 X.307 F.003 N200 G2 X.322 Z-.094 I.0120 K-.0155 F.003 N210 G2 X.314 Z-.106 I.0195 K.0000 F.003 N220 G2 X.3095 Z-.1085 I.0155 K.0120 F.003 N230 G1 X.3105 Z-.1185 F.003 N240 X.311 F.003 N250 G2 X.326 Z-.134 I.0120 K-.0155 F.003 N260 G2 X.318 Z-.146 I.0195 K.0000 F.003 N270 G2 X.3135 Z-.1485 I.0155 K.0120 F.003 N280 G1 X.3155 Z-.169 F.003 N290 X.5155 F.003 N300 G40 N310 M30 %