Struggling with vibrations.

Syko_Symatic

As the title states really!

I’ve tried tightening/loosening the belts, I’ve check the frame squareness, rebuilt the carriage, re-printed and beefed up all the parts, changed all the pulleys and their posts, tightened everything, greased the bearing blocks, changed motor currents, changed micro stepping, all to no avail.

Struggling with this one. I’ve redesigned everything, it’s very similar to the parts for a Voron, in an attempt to stabilise the X axis if that was the problem but nope.

Any help would really be appreciated.

No going to lie, it’s breaking me.

Syko_Symatic

@Syko_Symatic tried switching to 0.9 motors and it made it worse. Seems to be resonance on the X axis. I have been testing it with no hot end mounted and the vibration is still there. Pulled the frame apart and rebuilt it, problem still exists.

Still can’t think of a solution!

Phaedrux

Can you feel with your fingers where the vibration is actually happening? Once you find it the vibrations will probably stop when you touch it. Might give you a clue on how to stop it.

You can also try adjusting your motor currents. Higher currents may result in less vibration.

What microstepping are you using for x?

Syko_Symatic

@Phaedrux it seems to appear mainly towards the middle of the X axis. I have stripped it back down to the frame re-squared again and checked everything moves nicely (it does). As soon as I load it up with the belts the resonance starts to appear again. I have found that it tends to disappear around the 70-80mm/s speed. But between 30-60mm/s it’s pretty bad.

I added some more fixings to the x rail to make sure it was definitely fixed down. Added an additional cross-brace to stiffen the frame a bit more.

I started with 800ma and move up to 1200ma in 100ma increments and down to 400ma but no change.

Tried 0.9 deg motors, big nope with that one! Increased the vibrations massively.

Currently at 16x with Interpolation. Tried up to 128x with no change.

Hopefully I haven’t missed anything you mentioned, can’t see the comment while I reply

Syko_Symatic

@Syko_Symatic ok! I sorted it. resonance be gone

I added an additional linear rail (yes I have a few lying around), had a precision grade one from misumi, modified the carriage to suit, bam! Quiet!

Probably need to do the input shaping again to make it even better but the difference now is night and day!

Tinchus

@Syko_Symatic My guess by readin and looking the video: the problem is your guide. Remember that you have to take care of the 3 values of a linear guide rail: skew, tilt and roll. All 3 have different limits regarding the forces you can apply on them. Go outside of those limits and you will face nasty problems like this.
That is my guess, also I would check if the guide itself has not loose any of its balls during installation