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Hello All, I'm using this post processor (PlasmaCv2.1) in Fusion 360. My issue is that my first round hole in the gcode cuts no problem, machine come downs and probes, makes a perfect cut and then the Z axis rises 1-2inches and continues along the path in the gcode but doesn't come back down to start the plasma arc, it just runs the whole program without coming back down to initiate arc and cut the material. I don't get an "arc okay" error which is odd .I went back into Fusion360 and set my retract height and clearance height to 0 to see if that would help and maybe the THC via THCAD through a MESA 7i76 board would work but it just gave me an error. "Safe Traverse Height has been reduced to 0.23in"


Images attached of my cut parameters ,material properties , gcode from Fusion 360 and some misc info. 

The machine cuts simple parts using the conversational in QTplasmaC no problem, and my THC works so I've isolated it to the Fusion 360 Gcode and unsure how to fix my issue. Possible bug maybe?

I feel like I'm doing something really dumb and overlooking something really simple, in an effort to not waste another couple days going in circles, could anyone point me in the right direction, i greatly appreciate it!
 

Daan96 wrote:

Are the following components suitable for making a voltage divider? My plasma has a 1:1 arc output.
 

Yes.

Daan96 wrote:

I'm using a TH-CAD2 in combination with two resistors in series and a 0.1uF capacitor to absorb the voltage spikes. Am I doing this correctly?
 

Yes, but wire one resistor to each side of the arc voltage, not both on the same wire. That makes it much safer in case the cable is kicked somewhere on the way to electronics and lowers the interference caused by plasma source.
And you can skip the capacitor as it does work without it, but i like to have it as it smooths the voltage readout and subsequently the torch motion up/down while cutting, but it will limit a bit the reaction speed.

Daan96 wrote:

What happens if a voltage spike does occur? Will the capacitor fail?
 

Usually nothing, if the polarity is correct.

Daan96 wrote:

Can I connect the start arc and arc OK signals directly to the Mesa board, or is it better to use a relay to protect the mesa board?
 

Yes you can, 7i96S has two fully isolated outputs ( 4 and 5 i think, double check that), so no need for relay.

Daan96 wrote:

Can I route these signals to the plasma cutter through the same cable as the THC?
 

Yes, if the resistors are mounted inside or outside the plasma source, but close to the plasma source.

@tommylight
Sorry for the questions, but I'd like to get it right the first time. I'm not yet that good with various electrical components at a detailed level.
I've read through your other threads and I think I found the right info, thank you very much!!
Are the following components suitable for making a voltage divider? My plasma has a 1:1 arc output.
I'm using a TH-CAD2 in combination with two resistors in series and a 0.1uF capacitor to absorb the voltage spikes. Am I doing this correctly?
What happens if a voltage spike does occur? Will the capacitor fail?
 

I have another question.
Can I connect the start arc and arc OK signals directly to the Mesa board, or is it better to use a relay to protect the mesa board?
Can I route these signals to the plasma cutter through the same cable as the THC?