discriminant in velocity calculation error
- balestrino
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31 May 2015 16:20 - 31 May 2015 16:56 #59262
by balestrino
discriminant in velocity calculation error was created by balestrino
Hi,
i got an error: discriminant -1.981264 < 0 in velocity calculation
i'm using LinuxCNC 2.8.0 pre1
Gcode in attachment (error is near line 24730)
thank you
i got an error: discriminant -1.981264 < 0 in velocity calculation
i'm using LinuxCNC 2.8.0 pre1
Gcode in attachment (error is near line 24730)
thank you
Last edit: 31 May 2015 16:56 by balestrino.
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01 Jun 2015 21:47 #59309
by PCW
Replied by PCW on topic discriminant in velocity calculation error
I can duplicate this error. It seems sensitive to accel values
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02 Jun 2015 23:02 #59347
by andypugh
Replied by andypugh on topic discriminant in velocity calculation error
I will add it to the bug-tracker.
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- skunkworks
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03 Jun 2015 23:29 #59387
by skunkworks
Replied by skunkworks on topic discriminant in velocity calculation error
I pared it down to this snipit of gcode. It does violate acceleration constraints when it happens..
g21f1200
g0x0y0
g1X54.834 Y-52.151
X55.038 Y-59.286
G3 X58.636 Y-62.782 I3.598 J.103
X58.739 Y-62.781 I0. J3.599
X62.104 Y-60.15 I-.103 J3.598
G1 X62.158 Y-59.927 Z-3.31 F600.
X62.199 Y-59.701 Z-3.324
X62.376 Y-58.483 Z-3.403
X62.403 Y-58.242 Z-3.418
X62.413 Y-58.001 Z-3.433
X62.408 Y-57.759 Z-3.449
X62.386 Y-57.518 Z-3.464
X62.348 Y-57.279 Z-3.48
X62.294 Y-57.044 Z-3.495
G2 X62.121 Y-56.199 I7.25 J1.918
X62.069 Y-55.733 I7.423 J1.073
G1 X62.023 Y-55.583
m30
Accelleration needs to be set at 600mm/s^2 - my velocity was set to 211mm/s
g21f1200
g0x0y0
g1X54.834 Y-52.151
X55.038 Y-59.286
G3 X58.636 Y-62.782 I3.598 J.103
X58.739 Y-62.781 I0. J3.599
X62.104 Y-60.15 I-.103 J3.598
G1 X62.158 Y-59.927 Z-3.31 F600.
X62.199 Y-59.701 Z-3.324
X62.376 Y-58.483 Z-3.403
X62.403 Y-58.242 Z-3.418
X62.413 Y-58.001 Z-3.433
X62.408 Y-57.759 Z-3.449
X62.386 Y-57.518 Z-3.464
X62.348 Y-57.279 Z-3.48
X62.294 Y-57.044 Z-3.495
G2 X62.121 Y-56.199 I7.25 J1.918
X62.069 Y-55.733 I7.423 J1.073
G1 X62.023 Y-55.583
m30
Accelleration needs to be set at 600mm/s^2 - my velocity was set to 211mm/s
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