High peak at around 130Hz in belt tension with FMMM

Hi, I've been searching for a while now and checked almost every part of the printer. I checked every part on the EVA and every idler bearing. The tolerances are fine, nothing is overtightened. Nothing is rattling except for the SSR in the Back on a DIN-Rail a bit. At this point I'm really clueless what is causing this high peak. I recently switched to the FMMM Mod and have Metal mounts for the front idlers too. So in short: Is the peak coming from vibrations or is something binding?
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9 Replies
flat-fuchsia
flat-fuchsia17mo ago
The Graph was taken with the printer on the floor to exclude the table
Mr.Robot
Mr.Robot17mo ago
you should test where your going to print
flat-fuchsia
flat-fuchsia17mo ago
The Graph is basically the same. I just measured it on the ground to rule out vibrations from the Table below the printer as cause
Mr.Robot
Mr.Robot17mo ago
3D Printers & a Whiteboard
YouTube
How to Read and Analyze Input Shaper Graphs Generated by Klipper
This video is supposed to be a brief overview on what the input shaper graphs can tell us. It is the first video of a series of videos which will give a more in depth view on the kinematic system and input shaping in Klipper. As always: feel free to jump to those parts, that help you with your problems: 00:00 Intro 00:57 What we can learn from...
Mr.Robot
Mr.Robot17mo ago
this should help
flat-fuchsia
flat-fuchsia17mo ago
I've watched the whole video. But at this point I don't see what is wrong. The left is lower than the right which seems ok-ish. The peaks are mostly at the same height. And more important at the same Frequency Both peaks have a bump right of it which would, according to the video, mean a loose bolt and I'm out of ideas which Bolt should be loose. I checked: - every bolt in the gantry. - every bolt in the eva - every bolt in the idlers - every bolt at the motor mounts - every bolt on all the rails - every bolt of the frame corners (at least the top ones) But I don't know where these bumps are coming from and I have no explanation for the high peak at 130 Ok I now started to check the rails. Is this normal:
flat-fuchsia
flat-fuchsia17mo ago
Jens
Jens17mo ago
check if you can twist the carriage along the y axis it sounds like a normal completly dry rail to me
flat-fuchsia
flat-fuchsia17mo ago
Thank you for listening. I'll check. And I'll lubricate all the rails No twisting
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