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Wow who brought this back to life.!!! . . . .
Warwick buy foot pedal so much easier to Tig. I've found good Tig welding is all about prep and setup.
Unlike Gas or Mig which you basicly just grab...

It's easy to work out if you know the Dp (Diametric pitch) of the pinion which for 24T Mod1.5 is 36mm. Then times this by pi to give the Linear pitch before ratio which in this case is 113mm.

Now...

Ok well lets work it out for you. I'll assume Mod1 pinion. So the Diametric pitch (basicly diameter) will be 20mm because Mod1 =1mm times the #teeth.
Apply \pi and the affective pitch is 62.832mm...

USB could be problem.? It's flakey and not very good with noise. If you can afford it then I would look at controller with Ethernet.

Cslabs Ip-m is excellent industrial strength controller with...

So what is the bending force on your gantry from accelerating the Z axis components?
Suppose that is 3kg of motor, slide, torch, screws and stuff. Wild over estimate.
We know that 1kg force will...