Building a 4-axis plasma table

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20 Feb 2025 15:39 #322079 by Daan96
Building a 4-axis plasma table was created by Daan96
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.

 
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20 Feb 2025 19:54 #322102 by machinedude
Replied by machinedude on topic Building a 4-axis plasma table
Mach 3 is at a point where it is hard to run unless you have a really old version of windows. i used it for years until i hit issues in windows 10. so i would make the switch which i did do :)
when it comes to plasma and THC Linux with Mesa has probably the cheapest THC solutions out there but I'm in the US so duties and taxes could factor into it to some degree.

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20 Feb 2025 20:18 #322107 by rodw
Replied by rodw on topic Building a 4-axis plasma table
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!

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20 Feb 2025 22:36 #322120 by tommylight
Replied by tommylight on topic Building a 4-axis plasma table
Last i checked, something that comes close to QtPlasmaC in functionality (not in usability by far, much harder to use) was over 170000$ with a 300A plasma source that costs 84000$, leaving the machine price at 86000$ for 6X2.5M cut envelope!
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Here are some links that might help:
forum.linuxcnc.org/show-your-stuff/38547...-5m-cnc-plasma-build
forum.linuxcnc.org/show-your-stuff/48985...s-frequently-updated
forum.linuxcnc.org/show-your-stuff/35337...2m-work-area-or-12x7
forum.linuxcnc.org/show-your-stuff/35306-cnc-plasma-tube-cutter
The following user(s) said Thank You: rodw

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21 Feb 2025 10:31 #322191 by Daan96
Replied by Daan96 on topic Building a 4-axis plasma table
Then the choice seems quickly made; I'll have to get my hands on an old PC and start exploring Linux, which is completely new to me. Do you have it running on an old PC mounted near the table, or is it also possible to run Linux on a NUC?

In any case, I'll dive into the various posts on this forum while continuing with the mechanical design.

I see that QTPlasm doesn't work so easily for the rotation axis—perhaps I should leave it out for the first project and later build it as a standalone machine, just like Tommy did.

Thanks for the input! It's greatly appreciated!

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21 Feb 2025 10:48 #322192 by rodw
Replied by rodw on topic Building a 4-axis plasma table
I've not used it in earnest but QTplasmac installs fine with 4 axes with 2 motors on the gantry, XYYZA
I have installed it with 5 stepper drives though
Probably pair it up with Sheetcam rotary for CAM

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21 Feb 2025 15:18 #322211 by tommylight
Replied by tommylight on topic Building a 4-axis plasma table
Rotary machines for round tube are easy, just set them as normal 3 axis machine and make separate configs for each diameter, and use normal 2.5D CAM.
Square tubing is much harder to do properly.
And, i have built machine with attached rotary, almost always concluded that separate machines are better. You can not use both parts of the machine at the same time.

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