[paulkr]

When running a set of g-code to rout multiple pieces (nested on one sheet of material) the router bit starts out fine, but as it passes from one piece cut to the next piece cut it is "dropping" by approx. 1/16 to 1/8 inch with each consecutive piece cut. By the time it gets to the 4th or 5th piece it is trying to cut all the way through the sacrificial board into the router table. The CNC is a Multicam 610 plus running multicam software over ethernet to the CNC. Anyone have any clue what's going on here?? The 'sacrificial board' is 3/4 inch thick and the material is 1/2 inch.

The G-code is as follows:

M90
G70
G74
G90
G97 S18000
G00 T2
G00 Z-2.0000
G00 X2.2323 Y6.4334
M12
G00 X2.2323 Y6.4334 Z-0.0197
G01 X2.2323 Y6.4334 Z0.0000 F5
G01 X2.2323 Y6.4334 Z0.5250
G01 X1.8759 Y3.4546 F40
G03 X1.9851 Y3.3157 I0.1241 J-0.0149
G03 X83.8695 Y3.3157 I40.9422 J342.1843
G03 X83.9788 Y3.4546 I-0.0149 J0.1241
G01 X83.6224 Y6.4334
G03 X83.4834 Y6.5426 I-0.1241 J-0.0149
G02 X2.3713 Y6.5426 I-40.5561 J338.9574
G03 X2.2323 Y6.4334 I-0.0149 J-0.1241
G00 X2.2323 Y6.4334 Z-2.0000
G00 X5.0243 Y13.5338
M12
G00 X5.0243 Y13.5338 Z-0.0197
G01 X5.0243 Y13.5338 Z0.0000 F5
G01 X5.0243 Y13.5338 Z0.5250
G03 X4.8862 Y13.4235 I-0.0139 J-0.1242 F40.0
G01 X4.5531 Y10.4420
G03 X4.6635 Y10.3039 I0.1242 J-0.0139
G03 X81.1912 Y10.3039 I38.2639 J342.4942
G03 X81.3016 Y10.4420 I-0.0139 J0.1242
G01 X80.9685 Y13.4235
G03 X80.8304 Y13.5338 I-0.1242 J-0.0139
G02 X5.0243 Y13.5338 I-37.9030 J339.2643
G00 X5.0243 Y13.5338 Z-2.0000
G00 X2.2323 Y10.0584
M12
G00 X2.2323 Y10.0584 Z-0.0197
G01 X2.2323 Y10.0584 Z0.0000 F5
G01 X2.2323 Y10.0584 Z0.5250
G01 X1.8759 Y7.0796 F40
G03 X1.9851 Y6.9407 I0.1241 J-0.0149
G03 X83.8695 Y6.9407 I40.9422 J342.1843
G03 X83.9788 Y7.0796 I-0.0149 J0.1241
G01 X83.6224 Y10.0584
G03 X83.4834 Y10.1676 I-0.1241 J-0.0149
G02 X2.3713 Y10.1676 I-40.5561 J338.9574
G03 X2.2323 Y10.0584 I-0.0149 J-0.1241
G00 X2.2323 Y10.0584 Z-2.0000
G00 X118.0000 Y0.0000
M05
M02

We are at a loss of what we're doing wrong. Anyone? Bueller?

[locost_cam]

The code is correct so the problem must be with the machine. Does this machine use stepper motors? Your fault description sounds exactly like lost steps on a stepper driven machine. If it is servo driven, is there a mechanical problem such as a loose coupling on the encoder?