PLASMA CNC Material detection system

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07 Oct 2019 08:17 #147318 by adnanBaig
Hi everyone, i am a new comer to LINUXCNC and currently using MACH3 for my home brew CNC PLASMA cutter. I want to switch to LINUXCNC ASAP, but there are some obstacles due to my hardware configuration i have,

I use a relay system to detect material and for that i need to trigger some output pins during torch touch down and before the torch fires up, in MACH3, it`s a simple VB script but i wonder how can i achieve it using LINUXCNC.

here is an example of that code

Sleep(1000)
ActivateSignal(Output2) 'Turn ON probe sensing


Cfr = GetDro(18)
Code"G31 Z200 F500"
While Ismoving()
Wend

DeActivateSignal(Output2) 'Turn OFF probe sensing

Sleep(200)

Code"G92 Z0.00"
While Ismoving()
Wend

Code"G0 Z -3.00 F700" 'Pierce Height
While Ismoving()
Wend

Sleep(1000)





DoSpinCW()

Code"G4 P 1.1" ' Time delay

While Ismoving()
Wend


SetDro(18,Cfr)
While Ismoving()
Wend


A quick response to the problem would be much helpful.

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07 Oct 2019 09:32 #147320 by rodw
I'll talk about the old school way first. Linuxcnc is a bit more sophisticated than Mach when it comes to probing. There is no need to script anything as it can be done in gcode

BigJohnT has a n example touchoff procedure
o<touchoff> sub
(#1 pierce height, #2 pierce delay, #3 cut height)
F10
G38.2 Z-1.75 (Probe to find the surface)
G91
G1 Z0.070 (Raise up to Z0)
G90
G92 Z0 (Set Z0)
G1 Z#1
M3 S1
M66 P0 L1 Q5 (Wait for Arc OK from Torch)
G4 P#2 (Pause for pierce delay)
F25
Z#3 (goto cut height)
o<touchoff> endsub
M2

See gnipsel.com/shop/plasma/plasma.xhtml

This can be expanded somewhat to probe down fast with G38.2 than probe up more slowly with G38.5
See: linuxcnc.org/docs/2.8/html/gcode/g-code.html#gcode:g38

You can turn your relays on and off from gcode using M62-M65
linuxcnc.org/docs/2.8/html/gcode/m-code.html#mcode:m62-m65

But the better way would be to implement Phill's amazing Plasmac config in the docs for V 2.8 and V 2.9
See linuxcnc.org/docs/2.8/html/plasma/plasmac-user-guide.html

and don't forget to review the plasma primer
linuxcnc.org/docs/2.8/html/plasma/plasma-cnc-primer.html

So if you go down the Plasmac path you would reconfigure your relays as per the circuit diagram in the primer as follows:

1. 1 x double pole or 2 x single pole relays to keep the sensing circuit disconnected when not in use (triggered by an output)
2. 1 x single pole relay which is activated on material contact. It is used to trigger an input which is your probe signal.
The following user(s) said Thank You: chimeno, thefabricator03, adnanBaig

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07 Oct 2019 13:18 #147331 by tommylight
Use PlasmaC, it has everything you will ever need, and then some.
The following user(s) said Thank You: adnanBaig

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08 Oct 2019 04:29 #147422 by mariusl
Hi Tommy
Where is the best place to go look to get information to get started on PlasmaC?

Regards
Marius


www.bluearccnc.com

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08 Oct 2019 06:32 #147434 by phillc54

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08 Oct 2019 17:35 #147474 by mariusl
Thanks Phil
That is one hugely comprehensive user guide. Absolutely awesome work.

Regards
Marius


www.bluearccnc.com

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