Lathe stops at code line

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7 years 4 months ago #136386 by Erikcnc
Lathe stops at code line was created by Erikcnc
Hi all

so i wanted to test my rebuildet cnc lathe, but got this thing i cant find.

i have made a little program in fusion. i set up the lathe for a dry run, but it stops at line 18.
i got a post processor from autodesk.
Code:
% (1001) N10 G7 N11 G18 N12 G90 N13 G21 (FACE2) N14 T1 M6 (TEST TOOL) N15 G54 N16 M8 N17 G97 S84 M3 N18 G95 N19 G90 G0 X38. Z1. N20 G96 D3500 S10 M3 N21 G0 Z1.564 N22 X18. N23 G1 X10.828 F0.127 N24 X8. Z0.15 N25 X-0.2 N26 X2.628 Z1.564 N27 G0 X18. N28 Z1.164 N29 G1 X10.828 F0.127 N30 X8. Z-0.25 N31 X-0.2 N32 X2.628 Z1.164 N33 G0 X38. N34 Z1. N35 G97 S84 M3 (PROFILE1) N36 M9 N37 M5 N38 M1 N39 M8 N40 G97 S114 M3 N41 G95 N42 G0 X28. Z1. N43 G96 D3500 S10 M3 N44 G0 Z1.414 N45 X10.68 N46 G1 X9.828 F0.127 N47 X7. Z0. N48 Z-4.35 N49 X8. N50 X12. N51 G0 Z1.414 N52 X8.828 N53 G1 X6. Z0. F0.127 N54 Z-4.35 N55 X7. N56 X9.828 Z-2.936 N57 G0 Z1.414 N58 X7.828 N59 G1 X5. Z0. F0.127 N60 Z-1.493 N61 G3 X5.3 Z-1.85 I-0.35 K-0.357 N62 G1 Z-4.35 N63 X6. N64 X8.828 Z-2.936 N65 G0 Z1.414 N66 X7.085 N67 G1 X4.257 Z0. F0.127 N68 Z-1.35 N69 X4.3 N70 G3 X5.3 Z-1.85 K-0.5 N71 G1 X8.128 Z-0.436 N72 G0 Z1.414 N73 X6.343 N74 G1 X3.514 Z0. F0.127 N75 G3 X3.8 Z-0.35 I-0.357 K-0.35 N76 G1 Z-1.35 N77 X4.3 N78 X4.458 Z-1.356 N79 X4.611 Z-1.375 N80 X4.757 Z-1.405 N81 X7.585 Z0.009 N82 G0 Z1.164 N83 X5.707 N84 G1 X2.628 F0.127 N85 X-0.2 Z-0.25 N86 X2.8 N87 X2.877 Z-0.258 N88 X2.941 Z-0.279 N89 X2.985 Z-0.312 N90 X3. Z-0.35 N91 Z-1.75 N92 X4.3 N93 X4.377 Z-1.758 N94 X4.441 Z-1.779 N95 X4.485 Z-1.812 N96 X4.5 Z-1.85 N97 Z-4.35 N98 X7.328 Z-2.936 N99 X8.5 N100 G0 X28. N101 Z1. N102 G97 S114 M3 N103 M9 N104 M5 N105 M30 %

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7 years 4 months ago #136390 by PCW
Replied by PCW on topic Lathe stops at code line
One possibility is this from the LinuxCNC Gcode manual

It is an error if:

A new feed rate is not specified after switching to G94 or G95

Another possibility is motion.spindle-speed-in not connected properly or backwards etc

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7 years 4 months ago #136407 by Grotius
Replied by Grotius on topic Lathe stops at code line
@Erik,

For accurate handling, if i count the lines to 18 in the file i end up with :
N22 X18.

I mention that the fusion postprocessor can be updated to remove some dot's.

linuxcnc.org/docs/2.6/html/gcode/gcode.h...sec:G93-G94-G95-Mode

G95 - is Units per Revolution Mode In units per revolution mode, an F word is interpreted to mean the controlled point should move a certain number of inches per revolution of the spindle, depending on what length units are being used and which axis or axes are moving. G95 is not suitable for threading, for threading use G33 or G76. G95 requires that motion.spindle-speed-in to be connected.

It is an error if:
1. Inverse time feed mode is active and a line with G1, G2, or G3 (explicitly or implicitly) does not have an F word.
2. A new feed rate is not specified after switching to G94 or G95

Pcw wrote about the feed rate (2), it can be also option (1), but G93 is not the problem in this case.

I think it has to to with this : the controlled point should move a certain number of inches per revolution of the spindle.
With reducing X18 to X0.005 the machine will problably pass this line.

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7 years 4 months ago #136494 by andypugh
Replied by andypugh on topic Lathe stops at code line
I suspect that this is a spindle-at-speed problem.

Which line is highlighted when the motion stops?

Note that if spindle-at-speed is active then G0 moves will happen, but the machine will pause and wait for the spindle-at-speed pin to go true before any G1 move after a spindle speed change.

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7 years 4 months ago #136511 by Erikcnc
Replied by Erikcnc on topic Lathe stops at code line

andypugh wrote: I suspect that this is a spindle-at-speed problem.

Which line is highlighted when the motion stops?

Note that if spindle-at-speed is active then G0 moves will happen, but the machine will pause and wait for the spindle-at-speed pin to go true before any G1 move after a spindle speed change.



Thanks all for your answers.
I mend in deed line N22.
I've tried to remove the point and even edit it eith extra decimal.

I think it is indeed that speed problem.
The lathe has a spindle servo motor with encoder. 1:1 ratio.
The encoder output from the driver is connected to the mesa 7i76e board. What do I need to change?

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7 years 4 months ago #136512 by andypugh
Replied by andypugh on topic Lathe stops at code line
Do you see any mention of "motion.spindle.at-speed in your HAL file?

(And is this LinuxCNC 2.7 or 2.8? As I changed all the spindle pin names in 2.8)

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7 years 4 months ago #136632 by Erikcnc
Replied by Erikcnc on topic Lathe stops at code line

andypugh wrote: Do you see any mention of "motion.spindle.at-speed in your HAL file?

(And is this LinuxCNC 2.7 or 2.8? As I changed all the spindle pin names in 2.8)


yes, i fount the line "motion.spindle.at-speed " in the HAL file.
also i don`t know if i have the scale right.

linuxcnc is version 2.7.14

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7 years 4 months ago #136637 by andypugh
Replied by andypugh on topic Lathe stops at code line
I suggest opening three halmeters and looking at near.0.in0, near.0.in1 and near.0.out

I suspect you might find that your spindle-velocity-fb has a different sign to the spindle-velocity-cmd. If it is that make your encoder scale negative. That's [SPINDLE_9]ENCODER_SCALE in your INI.

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7 years 4 months ago #136780 by Erikcnc
Replied by Erikcnc on topic Lathe stops at code line

andypugh wrote: I suggest opening three halmeters and looking at near.0.in0, near.0.in1 and near.0.out

I suspect you might find that your spindle-velocity-fb has a different sign to the spindle-velocity-cmd. If it is that make your encoder scale negative. That's [SPINDLE_9]ENCODER_SCALE in your INI.


okay. so at 1500 rpm near.0.in1 gives a value of 25.
that should be fine. (1500/60)

but spindlevel-fb-rps gives a mutch lower value. and not constantly. it pops up ones a while. just enough to make a picture.

encoder scale is: 1024

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7 years 4 months ago #136782 by andypugh
Replied by andypugh on topic Lathe stops at code line
Looks like a problem with the spindle encoder.

hm2_7i76E.encoder.00.count is solidly on zero. This leads me to suspect that one of the spindle encoder phases is not connected.
(If this is deliberate then you need to set counter-mode to true for that encoder)

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