Opinion on these graphs | Rat Rig Community [Unofficial] | Page 1

blazing sail Jun 15, 2024, 4:05 AM

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fleet kindleBOT Jun 15, 2024, 4:05 AM

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tiny turtle Jun 15, 2024, 6:04 PM

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I have heard that pattern could be result of I umbilical tightness

blazing sail Jun 15, 2024, 6:11 PM

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How do you mean? The umbilical in this case is a USB toolhead board and cpap fan

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timid orbit Jun 15, 2024, 10:42 PM

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as a rule of thumb, if the scale number , is in 1e3 range or low 1e4 you likely have issues related to belts not being tensioned, binding or rails binding.

little drift Jun 15, 2024, 11:30 PM

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@timid orbit I think as well seeing ZV being 30k and MZV the lower being 1.5k there is some issues there.

timid orbit Jun 15, 2024, 11:42 PM

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When the scale is so low it's all noise, recommendations are just incorrect.

timid orbit Jun 16, 2024, 12:05 AM

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Can also be caused by a bad mount for adxl
Or broken adxl

blazing sail Jun 16, 2024, 6:14 AM

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Adxl is the beacon H

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The Y rails seem to have some binding/grinding. Reached out to fabreeko about them but been trying to fix them in the meantime

dull cape Jun 17, 2024, 9:06 AM

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Y axis has higher frequency peak than X axis... Unless you have Hybrid VC4 (I don't see second Y motor) then this is very sus.

timid orbit Jun 17, 2024, 1:11 PM

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dull cape Y axis has higher frequency peak than X axis... Unless you have Hybrid VC4 (I do...

it doesn't have higher frequency, we don't know what the real frequency is, because some mechanical issues make the test result invalid, best you can say about it is that there's a problem.
from what people shown on v-cores Y axis on hybrid is nowhere close to being better than X axis anyway 😄

dull cape Jun 17, 2024, 1:20 PM

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timid orbit it doesn't have higher frequency, we don't know what the real frequency is, beca...

X peak is at 60 Hz, Y peak is at 87 Hz. Simple as.

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ofc as I wrote this fact itself points out that something is wrong

timid orbit Jun 17, 2024, 1:30 PM

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dull cape ofc as I wrote this fact itself points out that something is wrong

the simple diagnosis is that the graph shows vibrations 30-100x smaller than they normally are. No need to compare it to X at all. X better than Y isn't universally true on all types of machines (pretty much only on corexy) so it;s not the best way of diagnosing problems. It's also possible to have better Y than X on corexy if the X axis is the one with the problem.

dull cape Jun 17, 2024, 1:33 PM

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Y value of the graphs doesn't show vibration "size". PSD says how much of the vibrations overall occurred at certain frequency.

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That's why you want the PSD as high as possible. If it is almost infinity then that means that resonance occurs only at infinitesimaly small frequency value

blazing sail Jun 17, 2024, 5:35 PM

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I'll re align everything. The X gantry is extremely smooth moving by hand but moving the Y axis by hand is very rough and grind-y

#Opinion on these graphs