Building a 3-axis plasma table with mesa 7i96s, THCad-2 and nema23 steppers

I've decided to immediately apply a 1:3 reduction ratio, which translates to 25mm (15T) or 20mm (12T) of displacement per revolution.

I want to listen to the advice of  rodw and  tommylight

This will change the design somewhat. I think I'll place the linear guide directly on the underside of the tubes to reduce contamination.

Slowly, all the parts are arriving, and I've started welding the table. Unfortunately, I have limited time

For now, I think I'll test it this way.
Later, I can make a support from cut aluminum plates.

I've also ordered the plasma source.
Any other tips and tricks? 

 

 

@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?