Help with small holes QTplasmaC

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04 May 2021 09:20 - 04 May 2021 09:20 #207805 by Clive S
Ok I am a bit confused .
In SheetCam there are two pp's . one Revision: F - May 15 2020 and one LinuxCNC PlasmaC

Which would be the correct one as I have seen that the first one is no longer in the list forum.linuxcnc.org/plasmac/38438-plasmac-post-processors#158267

From the manual linuxcnc.org/docs/devel/html/plasma/qtpl...c.html#_hole_cutting it shows
G21 (metric)
G64 P0.005
M52 P1 (allow paused motion)
F#<_hal[plasmac.cut-feed-rate]> (feed rate from cut parameters)
G0 X10 Y10
M3 $0 S1 (start cut)
G1 X0
M67 E3 Q60 (reduce feed rate to 60%)
G3 I10 (the hole)
M67 E3 Q0 (restore feed rate to 100%)
M5 $0 (end cut)
G0 X0 Y0
M2 (end job)

I have set up a test hole and slot from SheetCam with this result :-
;     file name: test slot.tap
; date and time: Tue May 04 2021    09:13:42
; postprocessor: PlasmaC_F.scpost rev: F
;
;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)
 F#<_hal[plasmac.cut-feed-rate]>
;end pre-amble
;
;begin material setup
 M190 P1 (t1: plasma, 1.8 mm kerf material)
 M66 P3 L3 Q2 (wait for valid change)
 F#<_hal[plasmac.cut-feed-rate]>
;end material setup
;
;begin test slot #1, cutting, 20.48mm
 G0 X7.808 Y51.566
 M3 $0 S1 (cut start)
 G2 X7.808 Y52.472 I0.453 J0.453
 G2 X7.808 Y52.472 I2.192 J-2.192
 M5 $0(cut stop)
;end test slot, cutting #1
;
;begin test slot #2, cutting, 66.40mm
 G0 X6.000 Y35.243
 M3 $0 S1 (cut start)
 G1 X6.000 Y14.628
 G3 X14.000 Y14.628 I4.000 J0.000
 G1 X14.000 Y35.243
 G3 X6.000 Y35.200 I-4.000 J0.000
 M5 $0(cut stop)
;end test slot, cutting #2

Should the PP alter the code to make the feed-rate lower ie. M67 E3 Q60 (reduce feed rate to 60%)

or is that done manually ?

What is the correct way ?
Last edit: 04 May 2021 09:20 by Clive S.

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04 May 2021 09:34 #207808 by phillc54
You need to apply the Path Rule for holes when you are creating the Operation.

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04 May 2021 10:53 #207816 by Clive S

phillc54 wrote: You need to apply the Path Rule for holes when you are creating the Operation.


Thanks, Is that in SheetCam ?

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04 May 2021 10:56 #207817 by phillc54
Yes. There were some rules supplied with the PP.

Warning: Spoiler! [ Click to expand ]
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04 May 2021 17:01 - 04 May 2021 21:34 #207850 by Clive S

phillc54 wrote: Yes. There were some rules supplied with the PP.

Warning: Spoiler! [ Click to expand ]


I am still stumped (or thick) on that screen in SheetCam I don't have any rules in the dropdown box it says none.

I don't remember any rules being supplied I have only seen the post PlasmaC.spost I have tried this





Am I putting the correct code M67 E3 Q60 in the correct place. . I still don't see any change in the feed rate.

Not sure where I am going wrong :( :(

Edit: Its late here but I think I have solved it. The gcode seem to look good if I use the SheetCam pp and not the PlasmC one
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Last edit: 04 May 2021 21:34 by Clive S.
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04 May 2021 23:49 #207909 by rodw
I don't think its possible to share cutting rules in a post processor. You need to create them yourself. They may be saved with the toolset though.

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04 May 2021 23:53 #207913 by phillc54
They were in a separate file...

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05 May 2021 06:14 #207932 by Clive S
Ok if I have it correct above by putting M67 E3 Q60 in start code and M67 E3 Q0 in end code (SheetCam)

Then is the THC locked as from the manual (If Velocity Reduction is invoked in the middle of the cut, the THC will be locked.)

If not how is that achieved ?

Also does all of the above apply to PlasmaC as well or was that done differently ?

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05 May 2021 06:22 - 05 May 2021 06:22 #207933 by phillc54

Clive S wrote: Ok if I have it correct above by putting M67 E3 Q60 in start code and M67 E3 Q0 in end code (SheetCam)

Then is the THC locked as from the manual (If Velocity Reduction is invoked in the middle of the cut, the THC will be locked.)

Yes, so long as the velocity is below the threshold set by VAD Threshold in the parameters tab.


Also does all of the above apply to PlasmaC as well or was that done differently ?

Yes, they are identical.
Last edit: 05 May 2021 06:22 by phillc54.
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05 May 2021 10:25 #207944 by bevins
I have seen similar behaviour also. I have rules in and when selected to slow the feedrate with radius smaller than x, it doesnt do it.
I cannot get the rules to work. It is not in the gcode either so the post is not using it.

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