I added G68 X0 Y0 R45 to a short program prior to the first tool call to see what would happen and I got the error "P37 Prog No Zero". The Mitsubishi manual doesn't really explain what that means, but I'm going to try tomorrow with a G68 after the WCS call and see where it goes. It's a shot in the dark.
The alternative isn't terrible, but it's not ideal. I can create a WCS in CAM that references the real-world offset, and just program it like that. It'll work but it's a lot of back and forth from the office to the machine.
This is embarrassing...
I typed XO YO instead of X0 Y0. Duh.
Okay, so I loaded this program, which is chamfering of a real part - just safely above the part, just to check out the G68 command.
O205108 (45 TEST)
(T37 D=6.35 CR=0. TAPER=45DEG - ZMIN=79.75 - CHAMFER MILL)
N10 G90 G94 G17
N15 G21
N20 G28 G91 Z0.
N25 G90
(2D CONTOUR6)
N30 M09
N35 T37 M06
N40 S3000 M03
N45 G59
N47 G68 X00 Y00 R-45.000
N60 G00 X-24.635 Y26.905
N65 G43 Z99.75 H37
N70 G00 Z84.75
N75 G01 Z81.75 F360.
N80 Z80.385
N85 G19 G02 Y26.27 Z79.75 J-0.635
N90 G01 Y25.635
N95 G17 G03 X-24. Y25. I0.635
N100 G01 X284.774
N105 X285.774 Y24.
N110 X285.775 Y-204.
N115 X284.774 Y-205.
N120 X-24. Y-205.001
N125 X-25. Y-204.
N130 Y24.
N135 X-24. Y25.
N140 G03 Y25.898 I-0.449 J0.449
N145 G01 X-24.45 Y26.347
N150 X-24.52 Y26.418 Z79.758
N155 X-24.588 Y26.486 Z79.781
N160 X-24.653 Y26.551 Z79.819
N165 X-24.713 Y26.611 Z79.871
N170 X-24.767 Y26.665 Z79.936
N175 X-24.813 Y26.711 Z80.012
N180 X-24.85 Y26.747 Z80.097
N185 X-24.877 Y26.774 Z80.189
N190 X-24.893 Y26.791 Z80.286
N195 X-24.899 Y26.796 Z80.385
N200 G00 Z99.75
N210 M09
N212 G69
N215 G53 Z0.
N220 G53 X500. Y0.
N225 M30
%
It errored out P11 plane chg (CR), because a G17, G18 or G19 cannot be called when G68 is active. Does that mean I should put the rotation above the tool calls and use the G59 absolute position as the center of rotation, OR SOME OTHER THING?
Calling planes may be a phenomenon of HSM 2D Contour toolpaths when chamfering, so I'll try something else that doesn't call any planes.