We FINALLY figured out what was causing my issue. While in "grinder mode" you cannot use constant surface speed. So I just had to move line N373 before line N369.

Would any of you intergrex experts out there have any idea why the following code would hang up on line number N369? That's what line is highlighted on the program monitor screen anyway. The REALLY weird thing about this is......the machine does the tool change to T5136 on line N363 and then just sits there. No red or blue alarms and the cycle start button is still green like the machine is running. The machinist can then RESET the machine, and do a NON-MODAL restart from line N358, and everything runs fine. Here's the program. ( ) (TOOL 2190, 80 DEG. BORING) (FINISH BORE ID) ( ) ( ) N324 M901 (MAIN SPINDLE SELECT) N325 M200 N326 M202 N327 T2190 T5136 M6 N328 G99 N329 G18 N330 M250 N331 G0 B0. N332 G53.5 N333 M251 N334 G50 S2500 R1 N335 G96 S500 M4 N336 G0 X8.016 Z2.9183 M153 N337 X1.5106 N338 Z.0707 N339 G99 G1 X1.652 Z0. F.006 N340 Z-.0017 N341 G2 X1.6507 Z-.0023 R.008 N342 G1 X1.6307 Z-.0123 N343 G2 X1.626 Z-.018 R.008 N344 G1 Z-2.4421 N345 X1.2891 Z-2.469 N346 G2 X1.2795 Z-2.4717 R.008 N347 G1 X1.2596 Z-2.4833 N348 G2 X1.2576 Z-2.4847 R.008 N349 G1 X.875 N350 X.775 Z-2.3981 N351 M154 N352 G0 Z2.9183 N353 X8.016 N354 M5 N355 G28 U0. N356 G28 W0. N357 G28 B0. N358 M1 ( ) (TOOL 5136, 1.00 BALLNOSE) (ROUGH THE HALF SPHERE) (LEAVING .020 STOCK) ( ) ( ) N359 M901 (MAIN SPINDLE SELECT) N360 M200 N361 M202 N362 T5136 M6 N363 G99 N364 G18 N365 M250 N366 G0 B0. N367 G53.5 N368 M251 N369 M610 (GRINDER MODE ON) N370 M611 S500 (MILLING SPINDLE SPEED) N371 M203 (MILLING SPINDLE FORWARD ON) N372 G50 S4000 R1 N373 G97 S1000 M3 N374 G0 X9. Z2.4263 M153 N375 X1.3952 N376 Z-2.396 N377 G99 G1 Z-2.496 F.006 N378 Z-2.684 N379 G2 X1.2159 Z-2.9719 R.53 N380 G3 X1. Z-3.0784 R.1079 N381 G1 Z-2.9784 N382 G0 Z2.4263 M9 N383 X9. N384 M205 (STOP MILLING SPINDLE) N385 M5 N386 M612 (GRINDER MODE OFF) N387 G28 U0. N388 G28 W0. N389 G28 B0. N390 M1 Any info would be greatly appreciated! Thanks! -Mike-