Z-Axis Setup Feedback

[jham4x4]

First off thanks for all of the knowledge shared here, I'm learning a lot on my first build. I wanted to get some feedback on if my Z-axis is fast enough for my plasma table or if I need to change the screw out. I've got the driver at 400 steps and am maxing out at 40 ipm. Based on one of Jim's posts saying 50 ipm would be optimal am I a little too slow or would I be better to try 200 steps and bypass the driver? I don't have funding for a THC yet but want to be sure I'm ready for when I can get one, and I'll be cutting flat sheet, no plans for corrugated at the moment.

Setup:
UC300ETH - UB1
Nema 23 stepper running 4.2A @ 48V
DQ542MA driver at 1/2 - 400 steps
Z-axis is 12tpi, floating head with breakaway
No THC

Sorry about the orientation

Thanks.

[Robertspark]

That leadscrew is a little tight (too close pitch) imo
12tpi =~2.11 mm/turn pitch

[Greolt]

Up until a few weeks ago I ran 2mm pitch leadscrew. Nema 17 linear stepper.

I primarily cut sheet material from 0.8 to 3mm thick. Never once did I strike a situation where it was too slow.

Unfortunately I had the stepper fail and replaced it with one with 8mm pitch. (Non captive linear stepper) It works fine too.

So I think go with what you have. If it needs changing later, then no big deal.

[jham4x4]

Thank you both for the feedback.

I'll stick with what I have for now to get the table up and running, and look at upgrading the z-axis once I add in a THC or when it becomes a necessity.

[Robertspark]

It will depend on what feedrate you are cutting at, which is related to the material and torch amperage.
It will also depend on how level your bed is (and stays when you get using it) and also how level or flat your material you are cutting is.

As well as consideration of the thermal expansion of material around the cut.