Z-Axis Setup Feedback

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Z-Axis Setup Feedback

Postby jham4x4 » Tue May 14, 2019 2:15 pm

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

Z-Axis Setup.jpg

Sorry about the orientation

Thanks.
jham4x4
 
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Re: Z-Axis Setup Feedback

Postby Robertspark » Tue May 14, 2019 5:15 pm

That leadscrew is a little tight (too close pitch) imo
12tpi =~2.11 mm/turn pitch
Rob
Einstein ― “If you can't explain it to a six year old, you don't understand it yourself”
...working my way through the 1000+ ways things don't work to find the one that does
UC400eth, UC300eth, UCCNC v1.2110, Neuron Lite
UCCNC v1.2110 Macro Manual
Robertspark
 
Posts: 1383
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Location: Nr Liverpool, England

Re: Z-Axis Setup Feedback

Postby Greolt » Wed May 15, 2019 9:56 am

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.
Greolt
 
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Joined: Sun Sep 04, 2016 6:22 am

Re: Z-Axis Setup Feedback

Postby jham4x4 » Wed May 15, 2019 4:13 pm

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.
jham4x4
 
Posts: 2
Joined: Wed Jan 23, 2019 7:35 pm

Re: Z-Axis Setup Feedback

Postby Robertspark » Wed May 15, 2019 6:46 pm

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.
Rob
Einstein ― “If you can't explain it to a six year old, you don't understand it yourself”
...working my way through the 1000+ ways things don't work to find the one that does
UC400eth, UC300eth, UCCNC v1.2110, Neuron Lite
UCCNC v1.2110 Macro Manual
Robertspark
 
Posts: 1383
Joined: Sat Sep 03, 2016 4:27 pm
Location: Nr Liverpool, England


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