Rat Rig Community [Unofficial]•15mo ago

VC4 500 - Looks all over the place

I simply cant make sense of it

KiemPlantOP•10/5/24, 5:12 PM

@chicken bump :)

KiemPlantOP•10/5/24, 5:13 PM

Still at the commisioning stage, without Y belts

chicken•10/5/24, 5:13 PM

so yah you have something going on

chicken•10/5/24, 5:13 PM

hows the belt tension graph look first of all?

chicken•10/5/24, 5:13 PM

your amplitude for this looks really low

KiemPlantOP•10/5/24, 5:13 PM

Also pretty bad tbh, will send them

KiemPlantOP•10/5/24, 5:13 PM

first one

KiemPlantOP•10/5/24, 5:13 PM

second

chicken•10/5/24, 5:13 PM

also are you using the toolboard or beacon to do resonance testing?

KiemPlantOP•10/5/24, 5:14 PM

I guess the toolboard? I just pressed "Generate shaper graphs" in RatOS

chicken•10/5/24, 5:15 PM

go into configurator tab and select setup wizard from the left toolboard, then click hardware selection on the right side and then scroll down

KiemPlantOP•10/5/24, 5:16 PM

Yes, they are set to Integrated On Toolboard, both

chicken•10/5/24, 5:16 PM

yah the belt graphs are not good, there should be two spikes, the first spike is the y axis and the second is the x axis. Whats the difference between your two graphs? Just two different runs?

KiemPlantOP•10/5/24, 5:17 PM

Yeah basically. I mean there's a 4 hour difference. But the only real thing I did in that time was connecting the orbiter filament sensor, and tightening everything down on the toolhead with tie-wraps

chicken•10/5/24, 5:18 PM

the tightening of everything down with tie-straps explains why the 2nd one is cleaner in the 80hz+ range

chicken•10/5/24, 5:18 PM

whats strange is why the lower belt did not spike

KiemPlantOP•10/5/24, 5:18 PM

I do have this one problem where it seems like my belts are rubbing, and Im not sure why. I tried to precisely position them in the center of the bearing/pully, but when I move in one direction the belt creeps up, and the other direction it creeps down

chicken•10/5/24, 5:18 PM

something is really binding or dampending things

KiemPlantOP•10/5/24, 5:19 PM

Maybe there is too much tension on the belts?

chicken•10/5/24, 5:19 PM

the belts are spiral cut off a much bigger closed belt so they are going to wonder up and down. Very normal. You just dont want them to stay stuck up against the side

KiemPlantOP•10/5/24, 5:19 PM

Because I did have to tighten down the left belt quite a bit to get my gantry straight after installing the belt

KiemPlantOP•10/5/24, 5:21 PM

The timing on creating this thread is not impeccable btw, I don't have too much time. But at the moment I'm kinda at a loss. The machine seems to work decently, yet my graphs are all over the place

chicken•10/5/24, 5:23 PM

its all good. was just trying to find a link. tg73 has a good starting point for belt tension https://discord.com/channels/582187371529764864/1223286652949106748/1272625387871928494

chicken•10/5/24, 5:24 PM

home the printer

chicken•10/5/24, 5:24 PM

then go into real time analysis and then pluck the belts on the left and right of the toolhead

chicken•10/5/24, 5:26 PM

vc400 CoreXY Belt Tension is a thread I helped someone on with a similar belt tension graph. I would worry about getting that at least somewhat clean before you worry about shaper graphs

chicken•10/5/24, 5:26 PM

for the 500mm machine I would tune to 85hz. Look in that other thread and I posted a video in the middle of it on me plucking the belts and how to read them

chicken•10/5/24, 5:27 PM

also if things are not aligned we can loosen either the jointer plate bolts to the y carriages or the jointer plate bolts to the x gantry and get things striaghtened up. I suspect its one of those two is off and causing some binding. Let me know when you have some time to do some testing

KiemPlantOP•10/5/24, 5:45 PM

Thanks so much for the information/sources! I will look into it tomorrow, gonna grab a few drinks ;)

KKiemPlant Thanks so much for the information/sources! I will look into it tomorrow, gonna ...

chicken•10/5/24, 6:07 PM

party on!

KiemPlantOP•10/6/24, 12:16 PM

Okay that real-time analysis tool is actually so sick

KiemPlantOP•10/6/24, 12:16 PM

Currently tuning to 85.4Hz

Cchicken also if things are not aligned we can loosen either the jointer plate bolts to t...

KiemPlantOP•10/6/24, 12:25 PM

yeah I also was kinda afraid that could be the problem, don't know how much effort that will be. Running a belt tension graph now

KiemPlantOP•10/6/24, 12:28 PM

KiemPlantOP•10/6/24, 12:28 PM

Seems better than the previous one, I guess?

KiemPlantOP•10/6/24, 12:29 PM

Gonna try a shaper graph just to see if there's any difference

KiemPlantOP•10/6/24, 12:35 PM

KiemPlantOP•10/6/24, 12:35 PM

Damn that improved a lot

KKiemPlant Click to see attachment

KiemPlantOP•10/6/24, 12:37 PM

Tho one of the blue peaks is missing here?

Oldschoolhippie•10/6/24, 12:41 PM

Had the same problem as you with only one peak. I then added one more tooth per side and then I had 2 peaks. It also straightened the axle for me. Before that it had a gap of 2mm on the left side when it was right at the front. I loosened the clamp at the front of the print head and moved it one tooth further. Apparently the belts were not the same length. If they are set too tight, I always have the problem that a spike disappears, see my documentation here: fix-my-resonanceVC4 500

KiemPlantOP•10/6/24, 12:43 PM

whoops I didnt realized it created two graphs :facepalm:

OOldschoolhippie Had the same problem as you with only one peak. I then added one more tooth per ...

KiemPlantOP•10/6/24, 12:44 PM

thanks for the info

KiemPlantOP•10/6/24, 12:45 PM

Now that I've tuned my belts, I got my 2.09mm gap back

KiemPlantOP•10/6/24, 12:45 PM

It's not straight indeed

KiemPlantOP•10/6/24, 12:45 PM

There is a gap on my left side

KiemPlantOP•10/6/24, 12:50 PM

Hmmm, this cant be good either

KiemPlantOP•10/6/24, 12:50 PM

Welp, time to loosen the belts I guess.

KiemPlantOP•10/6/24, 12:53 PM

This is with both tensioners at the same distance. There is way more tension on the bottom belt

rn_image_picker_lib_temp_77c925d7-4bc5-4718-b5cb-9f57d2ff229a.jpg

Oldschoolhippie•10/6/24, 12:55 PM

I must have opened and readjusted the straps on the back 5 times until I had it reasonably straight. I also opened the screws that clamp the X a few times until everything finally fitted. I then took out the last mm through the tooth at the front of the head until everything was perfectly aligned. I feel more like a beta tester than if I had bought a finished product.