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For now I am using the period as a base for calculating the frequency. Looks good so far. I will have to test for a while, but I think it should be fine now. Thank you for all your inputs!

there is no comparison. Linuxcnc's QTplasmac, a Mesa 7i96 and a THCAD2 will give you a high end system for almost nothing. Its feature set is very extensive. The difference is that the THC is managed internally by Linuxcnc, not an external THC so the system knows much more about what I'd going on and has much more ability to provide consistent results.
This is quite an old video but it shows what you can do

And the cut recovery features

nothing comes close!

Hello, my name is Daan Bent, 28 years old, and I’m from the Netherlands.
At the moment, I’ve started working on the mechanical design of a DIY plasma cutting table, with an option for a 4th axis to also cut tubes. For now, I want to focus on cutting plates, but I’d like to have the hardware prepared for a 4th axis later on.This brings me to the first problem I’m facing: I’m hesitating between Mach3, myplasmac, and LinuxCNC software/hardware. Given the forum, most of you will probably suggest going for Linux. My programming experience is very minimal, but I’m willing to learn and find it quite interesting. Do you think it’s doable? The advantage of myplasmac and Mach3 is that they seem easier to use in my opinion, but the options with Linux seem endless.Here’s the start of the design for my table, tips are of course very welcome! Over the next period, I’ll be focusing on the design of the mechanical part and diving deeper into the hardware and software.

 

I think one can not take for granted that EL3061's signal ground is the same potential as the workpiece ground. If you are lucky it might work, but to be on the safe side the torch signals should be isolated and free to float.