VC4 500 IDEX Y-axis having trouble
So I'm currently testing my resonance for my VC4 500 IDEX, and it seems that my Y direction is bad & not the same. I tuned my belts like the commission guide said and I even checked if the belts are equally tensioned with a pitch tuner app. Does anyone happend to know what the cause can be? Thanx in advance!
40 Replies
IDEX single mode results:
IDEX copy mode:
well it can be everything, tbh... I played around for ages on mine to get the y graph to look acceptable - do you have a measurement with anything to ballpark the tension right now?
IDEX mirror mode:
my only measurement atm is parking my gantry at the back and trying to have the same tune/sound it makes when you grab one belt
its the same way prusa uses it for the xl
i mean, will work with patience - from my experience on my 500 idex i had quite a bit more tension on y than x
with "wrong" tensions my graphs looked like yours
you might want to try something like GATS which basically is very helpful of getting the same tension on both belts, but I did mine with a lot of patience and a non reliable belter :KEKW:
but as you can see on my graphs, it seems that my single mode only hase really bad results in Y-direction. the rest seems to be quite acceptable
copy and mirror should always have better result than single mode
so i wouldn't worry about copy/mirror and focus on the single mode result afterwards your copy/mirror results should be even better
ok thanx I guess I have to just try bcs I dont have a printer atm :kekw:
and was it too tight/loose or not even when you had this?
both can be the cause, thats the biggest problem. what I did with my belter is tension y a touch lower than my x and very very very slowly making my way up with 1/8 turns of the screws
but don't be like me and try to get it "perfect" it will never be, everything above 6k mzv is perfectly fine for a 500, and since it's only important on the outer walls, dont waste as much time as i did :KEKW:
Ok thanx for the tips
Their is q strange thing tho. You can hear a strange rubbing sound in T1 but idk where its comming from
I checked my pulleys and they seem to be clear
yeah sounds weird - i remember having similar noises before switching to the heavy duty idlers (not saying that they fixed this issue but rather retightening something lose i guess)
dammed this sucks lol
@Jobbe this may help you see the spikes in live time and help you try to feel what's vibrating https://youtu.be/Tdz_CtPEFzY?si=i2_Fl5-2vJMadOg4
Mikkel Schmidt
YouTube
RatOS 2.1: Realtime Analysis using Axis Oscillator
Showcasing live analysis of 3d printer mechanics by using the axis oscillator functionality in the RatOS 2.1 Realtime Analysis Tool.
#klipper #3dprinting #ratrig
You could also run the test with a max frequency of 130 ish that way the chart is more zoomed in and you can more accurately see what frequency the issue is at
So if I understand the troubleshoot method correctly, I should check my resonance on Y-axis between 50-90HZ by touching components and see if the peak drops right?
That's correct but your range is a little off I am thinking T0 would be 70 to 95 for peak 3
Sorry had to edit a few times to get correct range
For T1 I would set it 45 and see if it goes down when you touch parts first fix that then move to the next spike
The more you lower the max range for the graph the easier it is to find the correct MHz value
ok thanx I'll try it on T0 first
oh yeah just 1 thing to be sure. at some moment I can really hear the bearing balls rattle of the Y-axis during resonance check
is that normal?
i have this same sound on T1 right now too!!
Oh make sure you got small filament peace in the orbiter
oh ok havent done that
just asking but is this good enough to print with? I'm just tired of repeately testing the belts and just getting a slightly other result. as for live resonance, it only appears to get lower when holding the toolhead (wich is logic)
dude i hear ya. ive been chasing an issue for almost a month now and my accel was 200 below your recommendations. i literally just took apart the gantry to try to find a rattle on T1 and found it was buttery smooth when moving it, so the grinding sound seems to have been related to a belt hangup somewhere.
the only "loose" screws were on the gantry sides (cant remember the name of it) cause they rotate with a bit of force but never lock into the assembly 🤷 edit: Joiner! thats the term
do you have any belt residue on your gantry bearings? the T1 side does for me so im wondering if we have the same problem
yes I also have some residue on both bearing sides
but thats normal
my plan now is just skipping the resonance for a sec and start printing the GATS in order do properly tension the belts
Oh ya you can print with it for sure it just means your outer walls need to be slower for it too look good like no ringing
Hmm I don't have any residue on one side but do the other. I think my bearings on the left side for T1 got jammed too cause it's not rolling smooth
Lmk how you make out. I might just need to reassemble everything and bear with the 3600 for a bit so I don't maintain this frustrated and discouraged state lol
I would do the skew test then print GATS sorry I didn't know you hadn't done that :pepehands:
Yeah ofc I'll finish the commision guide (skew and VAOC test) and then I'm gonna print that piece
Don't need the VAOC test for now as you'll need to redo it when you change belts will also need to redo skew as well but you need GATS to print straight to work correctly
do you really need to print everything twice for the GATS?
Well yeah, need to tension both sights simultaneously, otherwise you will skew your gantry
ok thanx for the information
God dammed now I cant even print
My printer seems to have layer shift issues
I haven't used it sorry 😔 I put my build on hold while I been learning from others whenever I go to work on mine I just get I meh 😑 maybe another time kinda feeling