Inssues Hole cutting

paulsao
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06 May 2024 19:55 #299961 by paulsao

Inssues Hole cutting was created by paulsao

Hello.I am using shetcaam and Qtplasmac making holes with central arc entry and using plasmac's automatic circle creation Option 2. Slowing down and overcutting. The problem is that Qtplasmac detects some holes automatically and others not, and only cuts the arc as it happens in the image. This occurs only at the arch entrance.

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snowgoer540
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06 May 2024 20:25 #299964 by snowgoer540

Replied by snowgoer540 on topic Inssues Hole cutting

May be helpful if you could post your g-code, please.

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paulsao
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06 May 2024 20:37 - 06 May 2024 20:37 #299966 by paulsao

Replied by paulsao on topic Inssues Hole cutting

Thanks for you reply.

; file name: holes.tap
; date and time: Mon May 06 2024 15:33:00
; postprocessor: LinuxCNC_PlasmaCv1.scpost rev: 0.5
;
;begin pre-amble
G21 (units: metric)
G40 (cutter compensation: off)
G90 (distance mode: absolute)
M52 P1 (adaptive feed: on)
M65 P2 (enable THC)
M65 P3 (enable torch)
M68 E3 Q0 (velocity 100%)
G64 P0.254 Q0.025 (tracking tolerances: 0.254mm)
#<holes> = 2
#<h_velocity> = 50
#<h_diameter> = 42
#<oclength> = 4
;end pre-amble
;
;begin material setup
T0 M6 (select plasma tool)
G43 H0 (apply tool offsets)
M66 P3 L3 Q2 (wait for valid change)
F#<_hal[plasmac.cut-feed-rate]>
;end material setup
G0 X119.111 Y45.5
M3 $0 S1 (plasma start)
M67 E3 Q100
G3 X113.985 Y50.627 I-2.563 J2.563
G3 X113.985 Y50.627 I5.127 J-5.127
M5 $0 (plasma end)
G0 X91.333 Y45.5
M3 $0 S1 (plasma start)
G3 X86.207 Y50.627 I-2.563 J2.563
G3 X86.207 Y50.627 I5.127 J-5.127
M5 $0 (plasma end)
G0 X63.556 Y45.5
M3 $0 S1 (plasma start)
G3 X58.429 Y50.627 I-2.563 J2.563
G3 X58.429 Y50.627 I5.127 J-5.127
M5 $0 (plasma end)
G0 X35.778 Y45.5
M3 $0 S1 (plasma start)
G3 X30.651 Y50.627 I-2.563 J2.563
G3 X30.651 Y50.627 I5.127 J-5.127
M5 $0 (plasma end)
G0 X8 Y45.5
M3 $0 S1 (plasma start)
G3 X2.873 Y50.627 I-2.563 J2.563
G3 X2.873 Y50.627 I5.127 J-5.127
M5 $0 (plasma end)
G0 X8 Y83
M3 $0 S1 (plasma start)
G3 X2.873 Y88.127 I-2.563 J2.563
G3 X2.873 Y88.127 I5.127 J-5.127
M5 $0 (plasma end)
G0 X35.778 Y83
M3 $0 S1 (plasma start)
G3 X40.904 Y88.127 I2.563 J2.563
G3 X40.904 Y88.127 I-5.127 J-5.127
M5 $0 (plasma end)
G0 X63.556 Y83
M3 $0 S1 (plasma start)
G3 X68.682 Y88.127 I2.563 J2.563
G3 X68.682 Y88.127 I-5.127 J-5.127
M5 $0 (plasma end)
G0 X91.333 Y83
M3 $0 S1 (plasma start)
G3 X96.46 Y88.127 I2.563 J2.563
G3 X96.46 Y88.127 I-5.127 J-5.127
M5 $0 (plasma end)
G0 X119.111 Y83
M3 $0 S1 (plasma start)
G3 X124.238 Y88.127 I2.563 J2.563
G3 X124.238 Y88.127 I-5.127 J-5.127
M5 $0 (plasma end)
G0 X146.889 Y83
M3 $0 S1 (plasma start)
G3 X152.015 Y88.127 I2.563 J2.563
G3 X152.015 Y88.127 I-5.127 J-5.127
M5 $0 (plasma end)
G0 X174.667 Y83
M3 $0 S1 (plasma start)
G3 X179.793 Y88.127 I2.563 J2.563
G3 X179.793 Y88.127 I-5.127 J-5.127
M5 $0 (plasma end)
G0 X202.444 Y83
M3 $0 S1 (plasma start)
G3 X207.571 Y88.127 I2.563 J2.563
G3 X207.571 Y88.127 I-5.127 J-5.127
M5 $0 (plasma end)
G0 X230.222 Y83
M3 $0 S1 (plasma start)
G3 X235.349 Y88.127 I2.563 J2.563
G3 X235.349 Y88.127 I-5.127 J-5.127
M5 $0 (plasma end)
G0 X258 Y83
M3 $0 S1 (plasma start)
G3 X263.127 Y88.127 I2.563 J2.563
G3 X263.127 Y88.127 I-5.127 J-5.127
M5 $0 (plasma end)
G0 X258 Y45.5
M3 $0 S1 (plasma start)
G3 X263.127 Y40.373 I2.563 J-2.563
G3 X263.127 Y40.373 I-5.127 J5.127
M5 $0 (plasma end)
G0 X258 Y8
M3 $0 S1 (plasma start)
G3 X263.127 Y2.873 I2.563 J-2.563
G3 X263.127 Y2.873 I-5.127 J5.127
M5 $0 (plasma end)
G0 X230.222 Y8
M3 $0 S1 (plasma start)
G3 X225.096 Y2.873 I-2.563 J-2.563
G3 X225.096 Y2.873 I5.127 J5.127
M5 $0 (plasma end)
G0 X202.444 Y8
M3 $0 S1 (plasma start)
G3 X197.318 Y2.873 I-2.563 J-2.563
G3 X197.318 Y2.873 I5.127 J5.127
M5 $0 (plasma end)
G0 X174.667 Y8
M3 $0 S1 (plasma start)
G3 X169.54 Y2.873 I-2.563 J-2.563
G3 X169.54 Y2.873 I5.127 J5.127
M5 $0 (plasma end)
G0 X146.889 Y8
M3 $0 S1 (plasma start)
G3 X141.762 Y2.873 I-2.563 J-2.563
G3 X141.762 Y2.873 I5.127 J5.127
M5 $0 (plasma end)
G0 X119.111 Y8
M3 $0 S1 (plasma start)
G3 X113.985 Y2.873 I-2.563 J-2.563
G3 X113.985 Y2.873 I5.127 J5.127
M5 $0 (plasma end)
G0 X91.333 Y8
M3 $0 S1 (plasma start)
G3 X86.207 Y2.873 I-2.563 J-2.563
G3 X86.207 Y2.873 I5.127 J5.127
M5 $0 (plasma end)
G0 X63.556 Y8
M3 $0 S1 (plasma start)
G3 X58.429 Y2.873 I-2.563 J-2.563
G3 X58.429 Y2.873 I5.127 J5.127
M5 $0 (plasma end)
G0 X35.778 Y8
M3 $0 S1 (plasma start)
G3 X30.651 Y2.873 I-2.563 J-2.563
G3 X30.651 Y2.873 I5.127 J5.127
M5 $0 (plasma end)
G0 X8 Y8
M3 $0 S1 (plasma start)
G3 X2.873 Y2.873 I-2.563 J-2.563
G3 X2.873 Y2.873 I5.127 J5.127
M5 $0 (plasma end)
G0 X146.889 Y45.5
M3 $0 S1 (plasma start)
G3 X152.015 Y40.373 I2.563 J-2.563
G3 X152.015 Y40.373 I-5.127 J5.127
M5 $0 (plasma end)
G0 X174.667 Y45.5
M3 $0 S1 (plasma start)
G3 X179.793 Y40.373 I2.563 J-2.563
G3 X179.793 Y40.373 I-5.127 J5.127
M5 $0 (plasma end)
G0 X202.444 Y45.5
M3 $0 S1 (plasma start)
G3 X207.571 Y40.373 I2.563 J-2.563
G3 X207.571 Y40.373 I-5.127 J5.127
M5 $0 (plasma end)
G0 X230.222 Y45.5
M3 $0 S1 (plasma start)
G3 X235.349 Y40.373 I2.563 J-2.563
G3 X235.349 Y40.373 I-5.127 J5.127
M5 $0 (plasma end)
;
;begin post-amble
G40 (cutter compensation: off)
G90 (distance mode: absolute)
M65 P2 (enable THC)
M65 P3 (enable torch)
M68 E3 Q0 (velocity 100%)
M5 $-1 (backup stop)
;end post-amble
;
;begin statistics
;Pierces = 30
; Cuts = 30, Length = 1708.24mm
;end statistics
;
M30 (end program)

Last edit: 06 May 2024 20:37 by paulsao.

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snowgoer540
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06 May 2024 21:34 #299972 by snowgoer540

Replied by snowgoer540 on topic Inssues Hole cutting

It runs fine here on my virtual machine. I did notice that it's running at 49.6% of the material feed rate, instead of 50%, I am not really sure why, but perhaps rounding error as I'm running this on an imperial simulation. Ignore the differences in colors, I change the color of the plotter via stylesheets.

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paulsao
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06 May 2024 21:51 #299973 by paulsao

Replied by paulsao on topic Inssues Hole cutting

It has me confused but I'm sure there is a mistake, because the problem only occurs when there is an arc in the entrance and not a perpendicular entrance. With the same code I have 4 uncut holes. I use metric units.

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snowgoer540
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07 May 2024 01:00 #299985 by snowgoer540

Replied by snowgoer540 on topic Inssues Hole cutting

I only had a few minutes this evening, I should have ran it through a metric config as well. Phill might be able to pick up where I left off this evening.

It is odd that everything ran at 49.6% velocity instead of 50%. Maybe it’s somehow related ¯\_(ツ)_/¯

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phillc54
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07 May 2024 07:00 #300006 by phillc54

Replied by phillc54 on topic Inssues Hole cutting

I can confirm that this is an issue on both QtPlasmaC and plasmac2 in both LinuxCNC 2.9 and master.
I have been able to consistently observe it on metric configs but it does not appear to happen on imperial configs, this is with both configs run both a metric g-code and a imperial g-code.
It does not happen on PlasmaC in LinuxCNC 2.8, nor does it seem to happen on AXIS in LinuxCNC 2.9.
It also happens with all hole detection features commented out, a simple piece of code like below does not run the second G3 line on some holes:

 G0 X8 Y45.5
 M3 $0 S1 (plasma start)
 G3 X2.873 Y50.627 I-2.563 J2.563
 G3 X2.873 Y50.627 I5.127 J-5.127
 M5 $0 (plasma end)

Adding a G4 P1 or a G0 X2.873 Y50.627 between the G3 lines appears to make no difference.

Currently I have no idea what is causing it...

In the meantime if you need to cut this job then changing the leadins to perpendicular should work.

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paulsao
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07 May 2024 13:14 #300032 by paulsao

Replied by paulsao on topic Inssues Hole cutting

Thanks Phill for confirming it, if I am going to change to perpendicular, in arc I got better results in the holes but I will have to change to do the job. Thank you anyway.

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snowgoer540
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07 May 2024 22:11 #300071 by snowgoer540

Replied by snowgoer540 on topic Inssues Hole cutting

It's odd, because the code Phill posted, works for me. But running paulsao's code, I get 3 holes in a row that don't work, so I isolated them and started playing around. I dont know why, but if I change the starting point coordinates by 0.001mm, it works:

Before:

 G0 X202.444 Y83
 G3 X207.571 Y88.127 I2.563 J2.563
 G3 X207.571 Y88.127 I-5.127 J-5.127

 G0 X230.222 Y83
 G3 X235.349 Y88.127 I2.563 J2.563
 G3 X235.349 Y88.127 I-5.127 J-5.127

 G0 X258.000 Y83
 G3 X263.127 Y88.127 I2.563 J2.563
 G3 X263.127 Y88.127 I-5.127 J-5.127

Result:

After:

 G0 X202.445 Y83
 G3 X207.571 Y88.127 I2.563 J2.563
 G3 X207.571 Y88.127 I-5.127 J-5.127

 G0 X230.223 Y83
 G3 X235.349 Y88.127 I2.563 J2.563
 G3 X235.349 Y88.127 I-5.127 J-5.127

 G0 X258.001 Y83
 G3 X263.127 Y88.127 I2.563 J2.563
 G3 X263.127 Y88.127 I-5.127 J-5.127

Result:

I do see this issue in the following GUIs:

QtDragon HD XYZ (although not for all the circles)

QtDragon XYZ Metric:

No idea why, but the following GUIs ran OK:
QtAxis
Axis

Total g-code, because I wonder if these holes work on either of your setups:

 G21 (units: metric)
 G40 (cutter compensation: off)
 G90 (distance mode: absolute)

 F10000

 G0 X202.444 Y83
 G3 X207.571 Y88.127 I2.563 J2.563
 G3 X207.571 Y88.127 I-5.127 J-5.127

 G0 X230.222 Y83
 G3 X235.349 Y88.127 I2.563 J2.563
 G3 X235.349 Y88.127 I-5.127 J-5.127

 G0 X258.000 Y83
 G3 X263.127 Y88.127 I2.563 J2.563
 G3 X263.127 Y88.127 I-5.127 J-5.127

 M30 (end program)

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snowgoer540
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07 May 2024 23:00 - 07 May 2024 23:03 #300073 by snowgoer540

Replied by snowgoer540 on topic Inssues Hole cutting

Well, I did some digging as I remembered some stuff around arcs and circles and what not. Long journey short, I came across this:

github.com/LinuxCNC/linuxcnc/commit/ad91...6d2b50d1fff275200941

Andy added the comment:

// andypugh 5/2/22 This seems to be interpreted to be in config units.

Which lead me to change line 717 of posemath.h to change the CART_FUZZ value from 1.0e-8 to 1.0e-7, and that worked, the arcs transitioned into the circles as intended.

Then I noticed that Phill you commented on Andy's commit. So I changed CART_FUZZ back to 1.0e-8, and made a change at line 1851 of _posemath.c to:

if (d < CART_FUZZ) {

To open the check up a little bit, and that also works. Since your commit and comment on andy's commit had to do with movement around circles, maybe the latter change is more appropriate?

I am honestly not sure which is more appropriate.

Last edit: 07 May 2024 23:03 by snowgoer540.

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Inssues Hole cutting

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