THC Problem - Linux/THCAD10/SheetCam

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02 May 2021 22:23 - 02 May 2021 22:43 #207687 by RNJFAB
Hey All,

Now everything running I'm having a few issues I would like to fix and need some guidance.

1st issue - from time to time, when cutting the Z axis will dive down and trigger the probe sensor. I'm guessing that its trying to get the voltage high and is diving to try and make this happen.

2nd issue - diving on corners. I know this can be adjusted in the settings or post processor. I just don't know how. these are my current settings.

3rd issue - PNP sensors on the limit switches trip out. I know I need some sort of debouncing in the Hal file, I just don't know what this looks like or how to do it. If someone has the lines of code for this can you post it please.


Link to my build with most details.
forum.linuxcnc.org/show-your-stuff/42411...ade-cheap-plasma-cnc
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Last edit: 02 May 2021 22:43 by RNJFAB.

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02 May 2021 22:50 #207690 by tommylight
Height per volt seems wrong, default is 1 and it should work just fine.
Diving issue, do you have corner lock on and at what percentage ?
If the sensors are tripping at torch fire, no amount of debounce will help. That will be grounding/shielding issue and has to be dealt with before ending up with something in smoke, besides the cutting smoke.
If they trip during homing, debounce helps so have a look at the existing machine config there are some debounces there so just add as much as you need and connect them to sensors in hal.

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03 May 2021 08:01 #207707 by robertspark
issue 1, you have it the wrong way around
torch will dive to lower the voltage, the voltage gets bigger when the gap gets wider. that is why when the torch slows, the kerf gets wider, the voltage gets higher and with thc the torch dives to LOWER the voltage sensed

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03 May 2021 09:27 #207710 by robertspark
issue 3, could be a few things. what plasma cutter are you using (make, model, link?)
how have you wired your proximity sensors?
(sketch the circuit please)

how much load do you have on the sensors, do they feed directly to an input pin. the impedance of the Mesa input pins on 7i76 is about 20k


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