Rat Rig Community [Unofficial]•2y ago

I can't resolve my vibration issues. Can someone help?

EDIT: I did a lot of testing and my issue has shifted. Explanation is a few comments lower (or here: https://discord.com/channels/582187371529764864/1084813725279715459/1085521418235678731) Hello, thanks to RatOS 2.0 i tested the linear movement analysis plugin and noticed very high vibrations on my Y axis. I believe this causes a wavy pattern on my prints, which are only on Y sides. I have all the graphs and pictures with wavy pattern attached. I do not know what causes this, but interestingly those vibrations overlap exactly with "2gt belt valley width". I am assuming my issue will be related to my belts even though I think they are tightened properly. Any help will be appreciated. Thank you in advance. Edit: Printer is V-Core 3.1 default kit

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18 Replies

automatic-azureOP•2y ago

I did some testing an tensioned my belts a bit more, which almost eliminated the linear vibrations on my Y axis, now I have them on the X axis. The prints also look better but not quite as good as I want them.

war4peace•2y ago

How do you run this? The vibrations graph, I mean.

automatic-azureOP•2y ago

With RatOS 2 "Klipper Linear Movement Vibrations Analysis" is preinstalled. You can find more info here: https://github.com/worksasintended/klipper_linear_movement_analysis

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automatic-azureOP•2y ago

I simply use MEASURE_LINEAR_VIBRATIONS AXIS=Y (or X) to run after enabling it in my printer.cfg. In printer.cfg i have:

[linear_movement_vibrations]
accel_chip: adxl345
x_min: 10
x_max: 390
y_min: 10
y_max: 390
output_directory: /home/pi/printer_data/config/linear_vibrations/

[linear_movement_vibrations]
accel_chip: adxl345
x_min: 10
x_max: 390
y_min: 10
y_max: 390
output_directory: /home/pi/printer_data/config/linear_vibrations/

war4peace•2y ago

Ah, great, thank you

automatic-azureOP•2y ago

I spend a full day testing and troubleshooting my issues. It only went downhill to put it lightly. What I did: - Check belts for banding -> the upper belt had some banding on the motor, which I fixed - Check for loose bolts on the EVA 3 -> disassembled it completely and reassembled while making sure every screw is tight - Re-tighten every single screw on the frame (none where loose but some could be tightened a bit more) - Reassembled the linear rails on X and Y - Made sure there is no more banding anywhere - Tightened the belts properly (after what was said here: https://discord.com/channels/582187371529764864/1049722650395672637/1050085812567543880) All this left me with following results:

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automatic-azureOP•2y ago

Those graphs looked way worse in between steps I took, but I did everything I think should help resolve my vibration issues. Since my issue shifted I will change the title of the this post. Feel free to ask anything, if something I described is unclear. Small update: I finally fixed my wiring, before it was just a mess. While doing so I noticed that my whole EVA 3 rocks back and forth with very little force. I seems like it is the carriage on the linear rail. Maybe this is where my vibrations come from? This is gonna be hard to test without using a new linear rail and carriage.

war4peace•2y ago

Do you happen to have a MGN9 rail?

automatic-azureOP•2y ago

Unfortunately not

MoyMadrigal•2y ago

I have a similar problem, I just put a new hiwin rail and it still keeps moving and looking closely I saw that it is not the rail, check if your rail really has play and just like you it only happens to me on the Y axis

automatic-azureOP•2y ago

When you're saying "rail" do you mean the carriage. where the EVA 3 gets mounted or only the long metal rail?

automatic-azureOP•2y ago

I tried making a video of it. I think you can see that the carriage hast just a little play:

MoyMadrigal•2y ago

that is the game that a hiwin rail has after 2 weeks of installing it brand new

ptegler•2y ago

..just went and videoed mine to look at freeplay. I'm not going to bother posting it as you cannot see any movement in my Hiwin rail on my gantry boom other than the flex of the printed parts (yes I was yanking that hard ) Mine is Z1 rated rail. with around 200 hrs on it. no movement is notable. 🤔

automatic-azureOP•2y ago

That looks even worse than mine! That's what I would expect from a linear rail. I actually contacted RatRig over my issue. They said the carriage should definitely not have this much play and they will send me a replacement. I will update when it arrives.

automatic-azureOP•2y ago

So the package arrived super fast and I swapped my linear rail. I tested if this one also got some play, and it has some but just a very tiny bit. Then I ran the input shaper and I now have this:

ptegler•2y ago

For a vibe test... (Y axis) stuff a piece of dense foam between the rail and the carriage backplate. seeif it DOES dampen the Y axis amplitude. It will prove rail carriage 'rocking' is what vibrates.... or will show something else is vibrating at those frequencies. I got rid of one of my vib spikes by adding duct tape to hold the X axis stop switch lever...and another I realized was the belt slapping the Y rail extrusion down the left side of the frame

automatic-azureOP•2y ago

Sorry for the late response, been pretty busy. I really cant put anything between the carriage and the rail, there is almost no space. But you are right, this way I could verify if this is issue.

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I can't resolve my vibration issues. Can someone help?