Air Scribe with PlasmaC

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09 Aug 2019 23:52 #141822 by phillc54
Replied by phillc54 on topic Air Scribe with PlasmaC
I like Roberts idea of M7/M8/M9 and a postprocessor to do it all, if would be totally independent of and from PlasmaC.

Although using any of the unused digital pins would be ok as well.

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10 Aug 2019 00:10 #141825 by Grotius
Replied by Grotius on topic Air Scribe with PlasmaC
Phill is right.... Row is right about his view related to postprocessing but he was struggling with the m3 thoughts i mentioned.....

Sheetcam can do the offset's for the scriber. The most easy way for sheetcam is to marry two existing post processor's.
Marry an existing 2 head's post with a plasmac post.

A more elegant way for plasmac is to integrate the usage of G code offset's. G90 for a scriber. It's so simple to implement Phill...
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10 Aug 2019 00:46 #141828 by rodw
Replied by rodw on topic Air Scribe with PlasmaC

phillc54 wrote: I like Roberts idea of M7/M8/M9 and a postprocessor to do it all, if would be totally independent of and from PlasmaC.

Although using any of the unused digital pins would be ok as well.


But you also need an M3 to start motion before you can engrave. Won't Plasmac see that and fire the torch? If you used the multispindle, plasmac won't even know.
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10 Aug 2019 00:50 - 10 Aug 2019 01:24 #141829 by rodw
Replied by rodw on topic Air Scribe with PlasmaC
.. deleted duplicate post ... sorry
Last edit: 10 Aug 2019 01:24 by rodw. Reason: delete duplicate post

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10 Aug 2019 01:04 #141831 by thefabricator03

phillc54 wrote: Do both air circuits operate from the one signal or is a separate signal required for each air circuit.


The way I have my system setup I need two signals, One to turn on the scribe and one to turn on the downward motion of the scribe holder.

Although I have read that some guys get away with one signal for both. I like my setup as I can test each part of the system separately.

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10 Aug 2019 01:05 #141832 by thefabricator03

phillc54 wrote: I downloaded SheetCam today and had a bit of play. I think I'll try to find some tutorials as I don't find it very intuitive although I did manage to get a reasonable postprocessor kinda working.


I would look into the arc light dynamics videos on youtube that Rod posted. They really helped me when I first started.
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10 Aug 2019 01:12 #141833 by thefabricator03
This is the example I used for my system that was posted on CNC Zone, It was posted by Shefron.

Attachments:

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10 Aug 2019 01:25 #141835 by thefabricator03

rodw wrote:

phillc54 wrote: I like Roberts idea of M7/M8/M9 and a postprocessor to do it all, if would be totally independent of and from PlasmaC.

Although using any of the unused digital pins would be ok as well.


But you also need an M3 to start motion before you can engrave. Won't Plasmac see that and fire the torch? If you used the multispindle, plasmac won't even know as its tied to spindle.0


This is where I dont really understand, If we are using multiple spindles does that mean that the G-code commands for the plasma torch wont apply if we have spindle 1 selected? Do we have to define spindle 0 as the plasma torch or is it already set up?

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10 Aug 2019 01:32 - 10 Aug 2019 01:37 #141836 by phillc54
Replied by phillc54 on topic Air Scribe with PlasmaC
You would need M3 $0 S1 for the PlasmaC side of things and M3 $1 S1 for the air scribe.

You could then use the spindle.1.on pin to activate the scribe.

Edit: You could still use M5 for the end of both as that will stop all spindles.

Edit2: Change to spindle.1.on
Last edit: 10 Aug 2019 01:37 by phillc54.

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10 Aug 2019 01:53 #141838 by rodw
Replied by rodw on topic Air Scribe with PlasmaC

thefabricator03 wrote: This is where I dont really understand, If we are using multiple spindles does that mean that the G-code commands for the plasma torch wont apply if we have spindle 1 selected? Do we have to define spindle 0 as the plasma torch or is it already set up?


Well my take on this is that each spindle has its own spindle.n.on signal and we use spindle 0 to trigger the torch (using spindle.0.on)
We are currently treating our machines as single spindle machines. But I think if you did gcode like this (and I'm no expert with gcode)
(set a spindle speed on all spindles to keep Linuxcnc happy)
S100 $0
S100 $1

(Cut something)
T1 M6 (select plasma tool - x, y offsets  = 0,0)
M3 $0 (use plasma)
...( cut some stuff)
M5 $0
Go x1,y1 (go somewhere else)
M3 $0 (use plasma and enable plasmac via spindle.0.on)
...( cut some more stuff)
M5 $0
(Engrave something)
T2 M6 (select scribe and set offsets and enable scribe via spindle.1.on)
M3 $1 (use engraver)
.... (engrave some stuff)
M5 $1
G0 x2,y2 (go somewhere else)
M3 $1 (use engraver)
.... (engrave some more stuff)
M5 $1

When you see how clean that code is, it does not really make sense to muddy it by adding a second signal to lower the torch. Sure that might happen but it should be done behind the scenes they way Plasmac does it. Plus you could have a whole row of tools up there. I did see Grotius post a pic with a drill bolted onto his gantry once.
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