Apparent Step Errors MKII

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02 Jun 2021 05:32 #210956 by jnwinkie
Replied by jnwinkie on topic Apparent Step Errors MKII
Hi Sam;

Table is loosely based on this design, with mods to accommodate the 4:1 reduction as recommended by Tommy.
www.instructables.com/CNC-Plasma-Table/

I tried as you suggested with the motors energized and couldn't budge the X and Y axis. The Z has a bit of deflection in the torch holding plate but I doubt that would be a problem as there is no real load on it when cutting.

Any other lines of thought would be greatly appreciated, as the table seems to work otherwise but I have a need to cut out a number of flanges and getting circles accurate is critical

Thanks

John

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02 Jun 2021 09:22 #210981 by tommylight
A check for binding should be done.
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03 Jun 2021 03:20 #211052 by jnwinkie
Replied by jnwinkie on topic Apparent Step Errors MKII
Thanks Tommy;

With the motors de-energized I can move the gantry with some effort and the Y axis moves OK as well.

Do I need bigger motors? The current ones are 3.1nM 4.2A. NEMA 23s
Thanks

John

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03 Jun 2021 12:39 #211090 by tommylight
Picture of drives DIP switches and settings ?
Motors should do just fine.
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03 Jun 2021 13:48 #211091 by samforsey12345
You are getting a very consistent error, to me this does not indicate step losses..

I use similar motors at ~2:1 and don't have any issues similar to what you are experiencing, although I gave up trying to get cheap chinese drivers to work

All the best
Sam
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03 Jun 2021 22:27 #211101 by jnwinkie
Replied by jnwinkie on topic Apparent Step Errors MKII
Will do today.

Thanks

John

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03 Jun 2021 22:28 #211102 by jnwinkie
Replied by jnwinkie on topic Apparent Step Errors MKII
Thanks Sam;

Could you tell me which drivers you use? Maybe worth checking into. Will post some pics later today my time as per Tommy's request.

Cheers

John

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03 Jun 2021 22:59 #211107 by tommylight

Will post some pics later today my time as per Tommy's request.

Who, me? :)
Yes and some pictures of the cuts, round and square shapes.
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04 Jun 2021 02:48 #211122 by jnwinkie
Replied by jnwinkie on topic Apparent Step Errors MKII
Hi Tommy and Sam;

I am using DM542T stepper controllers. They are set to 4.2A for X and Y and set to 400 steps per rev. I tried higher micro stepping (I think there was some pics earlier) and this made no appreciable difference.

Thanks for your help.

John

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04 Jun 2021 02:55 #211123 by BeagleBrainz
Maybe unrelated, but just for good wiring practice, I'd try to have some separation between the signals to the stepper drivers (and any other logic signals) and the output from the stepper drivers to the stepper motors.
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