Help me diagnose strong VFAs on my V2 | VORONDesign | Page 1

unkempt galleon Jul 16, 2024, 7:45 PM

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Im currently in the process of tuning my v2 and i have the problem that i am getting really strong vfas when the toolhead moves diagonally and minor vfas when the toolhead moves on x and y.

My setup:
• 0.9 degree ldo-42sth48-2004mah motors from ldo
• Clees idlers
• tmc 5160s drivers
• Danger Klipper on the bleeding-edge-v2 branch

What iv tried:
• 24V for x/y with tmc autotune
• 48V for x/y with tmc autotune or chopper tuning
• 24V without any driver tuning

Input shaper is tuned and i'm getting smooth_ei on x and smooth_mzv on x.

Ive followed ellis tuning guide https://ellis3dp.com/Print-Tuning-Guide/articles/troubleshooting/vfas.html but the suggested tips did not really help me. I dont quit know where to look to resolve the issues. Any advice would be welcome :)

unkempt galleon Jul 16, 2024, 9:01 PM

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Ive ran shaketun vibration analysis, the speed profile looks less then ideal

round otter Jul 17, 2024, 4:50 AM

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What's the rest of your shaketune stuff look like. Inputshaper and crossbelt?

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because that is kinda a trainwreck of a speed profile lol

unkempt galleon Jul 17, 2024, 5:28 AM

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unkempt galleon Jul 17, 2024, 5:29 AM

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round otter because that is kinda a trainwreck of a speed profile lol

Yea right? 😅 Input shaper and belt profile looks fine so no idea where thouse vibrations are comming from

round otter Jul 17, 2024, 7:04 AM

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unkempt galleon Yea right? 😅 Input shaper and belt profile looks fine so no idea where thouse v...

oh actually, i might know this one. its a long shot though since its been a while since i ran 0.9 degree motors

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Bump up the run current to something more like 1.2 or 1.4 amps. I have a vauge memory that when my 0.9s were right on the edge of not having enough current the weak magnetic field caused the motor to "twang" and have difficulty maintaining its accuracy. Sorta operating right on the very edge of actual step loss.

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that motor should be good for 2A, so you have lots of room to play with from 0.8

unkempt galleon Jul 17, 2024, 7:19 AM

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round otter Bump up the run current to something more like 1.2 or 1.4 amps. I have a vauge ...

yea its up to 2A. Ive ran them at 1.8A before turning it down to test if that would lower the ammounts of vfas that im seeing on orca slicers vfa test print. To low currents would explain the above artifacts. thx!

unkempt galleon Jul 17, 2024, 5:37 PM

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round otter Bump up the run current to something more like 1.2 or 1.4 amps. I have a vauge ...

ive tried the test print again with 1.4A and the artifacts are still present :(

unkempt galleon Jul 17, 2024, 6:10 PM

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This issue is really only present when the B motor moves. Could it be a damaged motor, driver?

#Help me diagnose strong VFAs on my V2