Superseded by :
forum.linuxcnc.org/plasma-laser/35449-another-plasma-component
linuxcnc.org/docs/devel/html/plasma/plasmac-user-guide.html
Please use the above config for plasma machines as it has all the possible features included.
Thank you PhillC.
forum.linuxcnc.org/plasma-laser/34978-th...-with-how-to?start=0
New configs also located there, including ones for MESA boards.
Still you might want to read through it as it has plenty of useful info.
Here is a config for simple plasma that have the usual UP DOWN ARCOK signals that actually works properly without giving feed errors and moving the Z axes randomly.
It is based on the THC300 config with relaxed timings and properly tested on 2 machines with PROMA THC.
There is a readme and how to file with some explanations for pin and scale and velocity/acceleration setup, so please do let me know if it is understandable.
Regards,
Tom
Edited to add config with HOW TO and README and everything that may be needed to get it working.
Adding some more info on how to start setting up the machine as it might be useful to many who are using THC not only from PROMA Elektronika, but in general.
>>added post heist>>
When you do get to testing it, follow this short procedure so you do not have to hunt around for problems that might arise:
---on the Proma THC (or similar THC)
--set the hysteresis at 2, ( or the lowest value you can set it)
--set the voltage difference at 2 (or 1 again lowest value, this is usually a +-2V so it takes 4V of difference for the torch to move)
--set the voltage to 140
--put it in test mode ( press both buttons till you see TST on the proma, on some others you need to switch it off, hold the middle button and switch it on while holding that button) and check if the UP/DOWN, ARC OK signals are in order and corresponding to up/down arc ok from the THC, visible on the right side of Linucnc
Now on LinuxCNC check the "switch travel" and adjust it accordingly, also the pierce height (GAP)set to 3mm
Press F9, it should move the torch down till it hits the material and continue moving down till it triggers the floating switch, move up to pierce height and fire the torch as shown by the yellow LED on the right side panel of Linuxcnc and wait for ARC OK signal without moving. If all is well, switch on the plasma and test again, it should pierce and start moving Z axis down slowly. Stop with F9 or ESC.
Now set you jog speed to something corresponding to your test metal thickness ( for 3mm--1/8inch set it to 1500mm/m or 60IPM and 40 to 50 Amps) .
Again press F9 and when you get the ARC OK press the arrow keys to move, watch if the torch is going up or down and the aprox distance from the metal. If all is OK, you should have the torch moving to high so just set the THC to a lover voltage and test again.
After 2 or 3 tries you should get nice cuts so now you can move on to testing actual cutting and finding a nice cutting height and feed speed.
Only after all this you can test and set the THC following speed, so set the metal plate at an angle aprox 3 to 4cm high on one side and flat to the table on the other. Do a test cut climbing the plate and dropping down. Set the "step size" on the right side panel of Linuxcnc lower or higher so you get it to follow that slope at a distance of at least 30cm (12inch) smoothly without to much of up/down torch movement.
That is it, now all you need is to set the Amps, feed and rarely voltage on the THC depending on the thickness of the material and the state of consumables.
It will take a bit of testing to get nice clean cuts without to much dross.
If you have problems with unclean cuts and too much dross (also referred to as slag), google for Hypertherm and Mr. Jim Colt, they are absolutely the best at what they do, Hypertherm as a manufacturer all other manufacturers should look up to for tech support for their products, and Jim for his relentless support on the forums and blogs and anything and everything regarding plasma cutting and cutters, he has a wealth of knowledge and he shares it like candy.
With utmost respect,
Tom
