Portolasas
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
@VisualTech48 @Helge Keck Feel free to check the info i have given, maybe some conclusions where utterly wrong, so I can clarify them. Maybe we can also put the thread in the Idex channel for better visibility - if it helps of course.
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
So I hope that helps you guys a bit and everyone that comes after. In total I needed about 30 measurements before I got this results. But ideally you should need less, since I played around quite a bit to get a better understanding of the interactions of the behaviors of the printer.
In the beginning you can also make bigger adjustments e.g. quarter (or sometimes half revolutions), until you get in the range where the graphs look good. But I suggest you move slow so you don't miss the turn 😉
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
And even though I got to MZV for the Y-axes and I would say that this is a generally good indication of a good tune, EI or Two-Hump EI or sometimes Three-Hump EI, was what I had most of the time. You should watch a general input shaper explanation beforehand to understand what those regression methods mean and where they differ. Accelleration is, of course, important but so are little vibration and smoothing. So keep that in mind.
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
You can clearly see the two Y-peaks and the more or less one x-peak. As mentioned, don't focus on the 100+Hz Y frequencies to much. An exception is if they get to similar amplitude as the main peaks. Then you have a twist, are to tight or to loose.
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
Also, there are definetly local maxima of accelaration. So if, for example, you tighten X and the results get worse and you loosen X afterwards and they also get worse you might be at such a local maxima. I suc a case I always switched to the other axis so in this example to Y and continued there.
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
6. For tightening I would suggest the following method: Start loose - tighten X with belt tension graphs so that they are as best aligned as possible - Generate shaper graphs and slowly tighten Y at both side simultaneously - When you get better results switch to X and slowly adjust one side at a time - Then back to Y.
Aim for an accelarion you want to reach and be happy when you get there. Don't want more and more. NEVER adjust X and Y at the same time, this introduces so many things you can't foresee. I always did a M84 followed by a homing after tightening, because by tightening the belts you may introduce a gantry twist and thereby "wrong shaper graphs which aren't the same after a restart.
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
They ain't perfectly pretty, but after the testing I have done its totally okay to have two peaks since it seems like the other carriage at the end of the axis always introduces its own frequency. The 100HZ+ range of frequencies are unavoidable. In many graphs they are just seemingly very small pecause the peak is at 1e6. Tightening together part of the wire looms and the PTFE tubes helped a lot with those frequencies.
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
4. One eighth of a revolution can often make quite the difference. Many people said that and its true. Move slowly and patiently. Remember, that at least for the Y-belts, tightening the right side a bit is more or less the same as un-tightening the left side a bit. This is less the case for X, since you have two carriages which are not connected but still here you have some dependencies which may seem huge.
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
3. Focus on the shaper graphs. What you want to achieve is acceleration and not perfectly aligned belt tensions. From what I noticed, in my case, the gantry stayed square.
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
2. As also mentioned in the comissioning guide, don't focus to much on the belt tension graphs. Since X and Y belts both assert force on X-axis, they are not independent. In my tests I would suggest to start with very low tensions and slowly increase them. First, create the peaks like above for X by tightening those belts, leave Y alone. For me this seems basic knowledge but ALWAYS watch the 1e4, 1e5, etc. It seems like many people don't understand that this is the scale of the axis. So e.g. 1e4 means take the number on the axis and multiply by 10^4. Of course, if your dominant peak increases in amplitude the "side" peaks seem smaller even though quite often they stay the same.
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
So now some general findings of my own; keep in mind this is no scientific study; I just test and assume some fundamental findings. They might be wrong.
1. for X you want to have ZV or MZV and one high peak. Only one toolhead is moving from left to right, so ideally only the resonance frequency of the print head should ideally be visibale. In my case they don't perfectly align, which is okay since they have a different weight and thereby may also have a different frequency.
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
I'm really sorry for you. I think the only thing that RatRig is really doing wrong is that they market the product a little bit wrong. It is simply not the case that everyone canbulit such a machine especially with the many new members to 3d printing. I started in 2019 and have rebuilt another printer to suit my own needs. I also built a V-core 3 and then upgraded it to a 3.1. Buying the 4 I very much knew which struggles I would have to endure and that there is no "out-of-the-box-experience".
You need some mechanical, electrical and OS-experience to really be able to fix issues in an efficient manner and can feel very easily lost if you don't. I have an engineering background and thereby also some foundation which I can rely on. So of course some things might seem like common sense to me but might not to somebody else. And knowing very well that I have already struggled quite a bit with my setup I can understand your frustration.
Two things to always keep in mind: So many people bought the 500 without needing it. I have a small business and I am looking into increasing my capabilities. A bigger printer isn't better; especially speed-wise. More moving mass means less speed, bigger tolerances (many that add up). And even more: A printer with two toolheads introduces more sources of resonance, even more mass and ESPECIALLY the two extra belts multiply the possible tightening scenarios by 4. The don't add to the other two, but are multiplating.
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
Y and X are both very much not independent, I have tried so much, I may be able to share later, but I am currently not at home
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
I assembled this one in about 28 hours and only had minor difficulties, biggest one was searching for the heavy duty idler pulleys I bought and haven't found till this day 😭
1158 replies
RRCRat Rig Community [Unofficial]
•Created by Anrot on 10/16/2024 in #fix-my-resonance
VC4 Idex Belts
The 3.1 was also a process... Took seemingly way longer to get properly assembled but without the idex tuning was pretty fast
1158 replies