Belt tension check
Being somewhat unsure of how things should look like, I would appreciate it if anybody can guide me to a resource or comment on how things should look like.
While it's ramping through the frequencies, I can quite clearly hear the belts going through some resonant frequencies where the belt is slapping against the extrusions. Is that typical?
12 Replies
sidenote: This is a 300 x 300 V3.1
Also attached my X and Y resonance graphs.
@wolfnacht thanks, I'll give that a look. Also recently found this very helpfull:
https://www.youtube.com/watch?v=M-yc_XM8sP4
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...
Here's the tool I found someone posted a few days ago I was talking about.
https://www.printables.com/model/151815-belt-tensioner-meter-9-mm-petg-prusament
Printables.com
Belt tensioner meter 9 mm, PETG Prusament by Locki | Download free ...
For 9 mm belts, print from PETG Prusament like original model | Download free 3D printable STL models
New X / Y and resonance, moved the printer to a different table without changing anything else. I think I'm just going to leave things as they are
other-emerald•8mo ago
tables can be a major contributor to resonances. For me it made a massive difference when I placed it on a concrete floor
having said that, your X and Y look really good if you ask me!
is it stock vcore 3.1?
This is indeed a stock 3.1, just trying to find the source of some diagonal move noise i am having. I thought this might be a good place to start to cross things off the list.
X, Y seems allright, but I'm unsure about the belt tension graph. Two peaks make sense (50 for Y, 75 for X). But what's going on around 125?
metropolitan-bronze•8mo ago
Those graphs and acceleration recommendations are very good for stock VC3.1, many here will have to sign a deal with evil for something like that 🙂
I do believe most of the time people see something like 10K on X and 5K on Y
I would print something with 10K max acceleration for outer walls and if quality match expectations - I'll do nothing more
other-emerald•8mo ago
125hz I believe is EVA. I don't think I have ever seen a graph that does not have some resonance at 125. Something else to check could be the wireloom when it's a little too stiff but I think that would show lower. But then again that all varies from one machine to another. Eva is typically responsible for the 125 peak though.
Allright, thank you for your input. It's easy to go down the rabbit hole I suppose 🙂 Marking this as solved!
I will re-build the EVA and see if I can improve something there, there's some nasty vibration going on during diagonal moves. For now it's looking like the Bondtech LGX lite's gears that seem to have some freedom to move.
other-emerald•8mo ago
ah and heat your hotend to 50C so the fan comes on, and set your part fan to 10 or 20% during the measurement. Also helps as disabled fans rattle more than spinning ones