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LinuxCNC controls CNC machines. It can drive milling machines, lathes, 3d printers, laser cutters, plasma cutters, robot arms, hexapods, and more.
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Need to write all G76 words in lowercase or interpreter fail. #876

Closed patrice-conil closed 4 years ago

patrice-conil commented 4 years ago

Here are the steps I follow to reproduce the issue:

  1. Try to use G76 in lathe mode with Gmoccapy
  2. With following gcode % (M14X1) N10 G7 N11 G18 N12 G90 N13 G21

(THREAD1) N14 M0 (CHANGE TO T5 ON REAR TOOL POST) N15 T5 M6 G43 N16 G54 N17 G97 S500 M3 N18 G95 N19 G90 G0 X24. Z5. N20 G0 Z2.5 X13.484 F1. N21 G76 P1.0 Z-14. I-0.1 J0.1 K1. N22 X13.27 N23 X13.106 N24 X12.967 N25 X12.845 N26 X12.735 N27 X12.634 N28 X12.539 N29 X12.451 N30 X12.367 N31 X12.287 N32 X12.211 N33 X12.138 N34 X12.068 N35 X12. N37 G0 X24. Z5.

N38 M5 N39 G53 X0. Z0. N40 M30 %

This is what I expected to happen:

An M14x1 thread will be cut

This is what happened instead:

Popup error with => P word is missing ...

It worked properly before this:

It works as expected only with all words in lowercase, .

Information about my hardware and software:

linuxcnc1:2.8.0~pre1.5914 SMP PREEMPT RT Debian 4.9.210-1 Mesa 7i96 with an Omron encoder on spindle.

andypugh commented 4 years ago

I don't think that the problem is related to case-sensitivity, are you sure that changing the case made the code work?

I think that you might be misunderstanding G76. It is a multi-pass threading cycle. You do not need the many X moves after the G76, those would be automatic.

What slightly surprises me is that G76 is modal. But it seems that is also needs a full set of parameters (so being modal isn't useful)

If you want to make a thread, then the single G76 line is sufficient.

If you want to program each pass separately, use G33.

patrice-conil commented 4 years ago

You're right Andy... that's my mistake. As I'm not a gcode guru, I used LinuxCNC turning post pro in Fusion to generate this sequence ... and I misinterpreted the error message focusing on G76 and loosing line number. Of course in my multiple tests, I removed the exceeding lines at the same time I lowercased the words. Sorry for your wasted time on this non error and thank you.

Patrice

andypugh commented 4 years ago

If that is output from the Fusion LinuxCNC Postprocessor then there is a bug there, as it appears to generate G-code that does not work.