Absolutely horrible frequency response

I have no idea what's causing this mess. My motor skips at >5000 accel btw. I've re-aligned the gantry like 5 times now
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18 Replies
Animatrix
Animatrix13mo ago
i think my belt is still slightly angled i have no idea how to fix it all the shims are there my belt is not even centered on the closest idler to the printhead, it runs to the bottom of it i've since re-aligned and changed my shims out for precision shims (had diff dimensions previously for the shims)
Animatrix
Animatrix13mo ago
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Animatrix
Animatrix13mo ago
my X looks semi-decent Y looks attrocious what's the peak at <20 ?
Animatrix
Animatrix13mo ago
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Animatrix
Animatrix13mo ago
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kokx
kokx13mo ago
I think your wire loom causes a lot of the noise in the resonances. Especially since the ethernet cable isn't really restrained and will resonate through to the ADXL quite a bit during movements
Animatrix
Animatrix13mo ago
i will add a few more cable ties
Animatrix
Animatrix13mo ago
any idea on what this could be ?
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Animatrix
Animatrix13mo ago
it looks like binding right ? low frequency resonance is generally binding or so i've heard i will remove the spool and check
kokx
kokx13mo ago
It could be part of wire loom issues as well. Binding (except when its really horrible) you generally won't detect using resonance detection, since the carriage doesn't move enough for that. You can more easily detect binding manually though, by simply moving the carriage gently by hand and feeling if it binds anywhere
continuing-cyan
continuing-cyan13mo ago
Looking at your gantry I see some rust on your bearings. Make sure you have smooth and clean motion system.
Animatrix
Animatrix13mo ago
It's not rust, it's from the belts unfortunately
McNik
McNik13mo ago
there should't be any rub of in the middle of the bearings. Are they turning easily? Did you put some lube between them?
Animatrix
Animatrix13mo ago
didn't lube them i have grease that i can try where should i use it ? on the front face of the bearing or the inner face lithium grease do you mean betwen the stacks ? the bearings do turn easily when the belt is not tensioned once they're tensioned i cant move them
McNik
McNik13mo ago
i lube between each bearing. not much, but some is always good. not on the sides that face the belts
Animatrix
Animatrix13mo ago
there's this rubbery deposit on my bearings
McNik
McNik13mo ago
debris on the bearings means the belts are rubbing on them and not turning them
Animatrix
Animatrix13mo ago
hmm i'll loosen all the stacks i hope that helps i even have 7.5x5x1 precision shims that are even better than 8x5x1 less chances of clamping
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