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feed rate changes without f command
« on: February 07, 2016, 09:36:58 PM »
I'm having a strange problem with mach3. Sometimes while my gcode is running, the feed rate will change to some random value for one line without the code telling it to. It seems to happen the most with G2 lines, although I'm pretty sure I saw it happen on a G1 as well. It's hard to tell, because the feedrate is jumping to a very high number, and the moves are short since my part is small. Once I figured out what was happening, I stopped the machine, and ran the code again cutting air. In one test the feed rate was jumping to 6507mm/min. The next time I ran it, it was jumping to 7600mm/min. This jump happens several times randomly throughout the file going to the same crazy feed rate each time, but restarting the program changes the number it jumps to. I thought that maybe forcing the post to put the feed rate on every line would help. It did not fix the problem, but I managed to get a screenshot of it going to a crazy value during the test. Any idea what is going on here? I can't really use the machine right now, as these jumps will cause it to ruin tools/parts.

Code: [Select]
%
(1001)
(BOTTOM PLATE FOR NICHS 3D PRINTER. OUTLINE UPDATE)
(T1  D=6.274 CR=0. - ZMIN=-7.35 - FLAT END MILL)
N10 G90 G54 G64 G50 G17 G40 G80 G94 G91.1 G49
N20 G21
N30 G28 G91 Z0.
N40 G90

(OUTSIDE ROUGH)
N50 M998
N60 T1 G43 H1 M6
N70 S8000 M3
N80 G54
N90 G0 X106.76 Y-75.237
N100 M9
N110 G0 Z50.
N120 G0 Z5.
N130 G1 Z2. F200.
N140 G1 Z1. F150.
N150 G1 X49.488 Z-1. F200.
N160 G1 X19.5 F300.
N170 G2 X5.871 Y-51.632 R15.737 F300.
N180 G1 X31.997 Y-6.382 F300.
N190 G2 X36.532 Y-3.763 R5.237 F300.
N200 G1 X114.222 F300.
N210 G2 X118.757 Y-6.382 R5.237 F300.
N220 G1 X144.883 Y-51.632 F300.
N230 G2 X131.254 Y-75.237 R15.737 F300.
N240 G1 X49.488 F300.
N250 G1 X48.488 F300.
N260 G1 X19.852 Z-2. F200.
N270 G1 X19.5 F300.
N280 G2 X5.871 Y-51.632 R15.737 F300.
N290 G1 X31.997 Y-6.382 F300.
N300 G2 X36.532 Y-3.763 R5.237 F300.
N310 G1 X114.222 F300.
N320 G2 X118.757 Y-6.382 R5.237 F300.
N330 G1 X144.883 Y-51.632 F300.
N340 G2 X131.254 Y-75.237 R15.737 F300.
N350 G1 X48.488 F300.
N360 G1 X19.852 F300.
N370 G1 X19.5 F300.
N380 G2 X18.852 Y-75.224 R15.737 F300.
N390 G2 X4.421 Y-54.999 Z-3. R15.737 F200.
N400 G2 X5.871 Y-51.632 R15.737 F300.
N410 G1 X31.997 Y-6.382 F300.
N420 G2 X36.532 Y-3.763 R5.237 F300.
N430 G1 X114.222 F300.
N440 G2 X118.757 Y-6.382 R5.237 F300.
N450 G1 X144.883 Y-51.632 F300.
N460 G2 X131.254 Y-75.237 R15.737 F300.
N470 G1 X19.5 F300.
N480 G2 X4.737 Y-54.05 R15.737 F300.
N490 G2 X5.871 Y-51.632 Z-3.093 R15.737 F200.
N500 G1 X18.852 Y-29.148 Z-4. F200.
N510 G1 X31.997 Y-6.382 F300.
N520 G2 X36.532 Y-3.763 R5.237 F300.
N530 G1 X114.222 F300.
N540 G2 X118.757 Y-6.382 R5.237 F300.
N550 G1 X144.883 Y-51.632 F300.
N560 G2 X131.254 Y-75.237 R15.737 F300.
N570 G1 X19.5 F300.
N580 G2 X5.871 Y-51.632 R15.737 F300.
N590 G1 X18.852 Y-29.148 F300.
N600 G1 X19.352 Y-28.282 F300.
N610 G1 X31.997 Y-6.382 Z-4.883 F200.
N620 G2 X34.454 Y-4.193 Z-5. R5.237 F200.
N630 G2 X36.532 Y-3.763 R5.237 F300.
N640 G1 X114.222 F300.
N650 G2 X118.757 Y-6.382 R5.237 F300.
N660 G1 X144.883 Y-51.632 F300.
N670 G2 X131.254 Y-75.237 R15.737 F300.
N680 G1 X19.5 F300.
N690 G2 X5.871 Y-51.632 R15.737 F300.
N700 G1 X19.352 Y-28.282 F300.
N710 G1 X31.997 Y-6.382 F300.
N720 G2 X35.404 Y-3.886 R5.237 F300.
N730 G2 X36.532 Y-3.763 Z-5.04 R5.237 F200.
N740 G1 X64.032 Z-6. F200.
N750 G1 X114.222 F300.
N760 G2 X118.757 Y-6.382 R5.237 F300.
N770 G1 X144.883 Y-51.632 F300.
N780 G2 X131.254 Y-75.237 R15.737 F300.
N790 G1 X19.5 F300.
N800 G2 X5.871 Y-51.632 R15.737 F300.
N810 G1 X31.997 Y-6.382 F300.
N820 G2 X36.532 Y-3.763 R5.237 F300.
N830 G1 X64.032 F300.
N840 G1 X65.032 F300.
N850 G1 X93.668 Z-7. F200.
N860 G1 X114.222 F300.
N870 G2 X118.757 Y-6.382 R5.237 F300.
N880 G1 X144.883 Y-51.632 F300.
N890 G2 X131.254 Y-75.237 R15.737 F300.
N900 G1 X19.5 F300.
N910 G2 X5.871 Y-51.632 R15.737 F300.
N920 G1 X31.997 Y-6.382 F300.
N930 G2 X36.532 Y-3.763 R5.237 F300.
N940 G1 X93.668 F300.
N950 G1 X94.668 F300.
N960 G1 X104.691 Z-7.35 F200.
N970 G1 X114.222 F300.
N980 G2 X118.757 Y-6.382 R5.237 F300.
N990 G1 X144.883 Y-51.632 F300.
N1000 G2 X131.254 Y-75.237 R15.737 F300.
N1010 G1 X19.5 F300.
N1020 G2 X5.871 Y-51.632 R15.737 F300.
N1030 G1 X31.997 Y-6.382 F300.
N1040 G2 X36.532 Y-3.763 R5.237 F300.
N1050 G1 X94.668 F300.
N1060 G1 X104.691 F300.
N1070 G1 X105.691 F300.
N1080 G0 Z50.

(OUTSIDE FINISH)
N1100 S10000 M3
N1110 G0 X77.086 Y-75.535
N1120 M9
N1130 G0 Z50.
N1140 G0 Z5.
N1150 G1 Z1. F300.
N1160 G1 Z-6.723 F200.
N1170 G1 X77.079 Y-75.531 Z-6.821 F200.
N1180 G1 X77.059 Y-75.519 Z-6.916 F200.
N1190 G1 X77.027 Y-75.5 Z-7.007 F200.
N1200 G1 X76.982 Y-75.475 Z-7.091 F200.
N1210 G1 X76.927 Y-75.443 Z-7.166 F200.
N1220 G1 X76.862 Y-75.405 Z-7.23 F200.
N1230 G1 X76.789 Y-75.363 Z-7.282 F200.
N1240 G1 X76.711 Y-75.318 Z-7.319 F200.
N1250 G1 X76.628 Y-75.27 Z-7.342 F200.
N1260 G1 X76.543 Y-75.221 Z-7.35 F200.
N1270 G3 X76.229 Y-75.137 R0.627 F300.
N1280 G1 X19.5 F400.
N1290 G2 X5.958 Y-51.682 R15.637 F400.
N1300 G1 X32.083 Y-6.432 F400.
N1310 G2 X36.532 Y-3.863 R5.137 F400.
N1320 G1 X114.222 F400.
N1330 G2 X118.671 Y-6.432 R5.137 F400.
N1340 G1 X144.797 Y-51.682 F400.
N1350 G2 X131.254 Y-75.137 R15.637 F400.
N1360 G1 X76.229 F400.
N1370 G1 X75.229 F400.
N1380 G3 X74.915 Y-75.221 R0.627 F300.
N1390 G1 X74.83 Y-75.27 Z-7.342 F300.
N1400 G1 X74.747 Y-75.318 Z-7.319 F300.
N1410 G1 X74.669 Y-75.363 Z-7.282 F300.
N1420 G1 X74.596 Y-75.405 Z-7.23 F300.
N1430 G1 X74.531 Y-75.443 Z-7.166 F300.
N1440 G1 X74.476 Y-75.475 Z-7.091 F300.
N1450 G1 X74.431 Y-75.5 Z-7.007 F300.
N1460 G1 X74.399 Y-75.519 Z-6.916 F300.
N1470 G1 X74.379 Y-75.531 Z-6.821 F300.
N1480 G1 X74.372 Y-75.535 Z-6.723 F300.
N1490 G0 Z50.

N1510 M9
N1520 G28 G91 Z0.
N1530 G28 X0. Y0.
N1540 M30

Offline BR549

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Re: feed rate changes without f command
« Reply #1 on: February 07, 2016, 10:01:40 PM »
Tormach supports their OWN version of Mach3 you really need to talk to them.

(;-) TP
Re: feed rate changes without f command
« Reply #2 on: February 09, 2016, 10:34:19 AM »
ran fine on mine
Re: feed rate changes without f command
« Reply #3 on: February 09, 2016, 12:26:45 PM »
Thanks for testing it out. I guess something must just be weird with my computer. I didn't think there was anything crazy in the gcode, but I'm no expert. I'm talking to Tormach now to see if they can help.

Offline Vogavt

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Re: feed rate changes without f command
« Reply #4 on: February 09, 2016, 04:20:19 PM »
As a side question, I was just wondering if you're in Constant Velocity mode or Exact Stop mode.

I see that the Code says F300 but your screenshot at that time shows a feedrate of 5545.02. That's certainly way off!
« Last Edit: February 09, 2016, 04:23:55 PM by Vogavt »