VCore 3.1 resonance on horizontal moves
My newly built 3.1 doesn't seem to like horizontal moves, but seems much happier on diagonals (I just realized the stepper speeds up for diagonals, so could just be due to the speed of the stepper).
https://youtu.be/vYWcLRGib8c
The above video is at 75 mm/s using spreadcycle, so no stealthchop applied here. I have tried the "fix" involving switching stepper poles and inverting the direction, but that seems to have no effect.
This is using the "basic" profile (1.1a run current) on the new RatOS V2 beta.
I have removed anything i could from the tool head in order to limit things vibrating along with the resonances, but it seems to originate from the steppers / belts. It doesn't seem to change with belt tension.
What would be my next step here?
19 Replies
diagnal moves of the carriage is only ONE motor moving at a time. (just watch your rear pulleys) So yes a diag move is quiter, one vs two steppers running.
belt tension? (matched.... and how tight/loose) Some of that sounds like the frame itself vibrating.
I can certainly feel the resonances thoughout the frame, but I can't seem to pinpoint a source. I've tried tighter and loser belts, doesn't seem to make a difference.
This is still the "basic" setup. I did notice that switching this to the "COOLED" profile calms things down quite a bit
just for a test... in your printer.cfg file.... you'll have two sections like:
[tmc2209 stepper_x]
run_current: 1.6
stealthchop_threshold: 0
and one for Y
set both stealthchop_thresold statements to 9999 , restart and see what it sounds like (note...you're current should be lower until you get things tuned and have active cooling for the steppers)
set both stealthchop_thresold statements to 9999 , restart and see what it sounds like (note...you're current should be lower until you get things tuned and have active cooling for the steppers)
this is on ratos v2 beta, so there are profiles for stealthchop - switching now
obviously quite a bit more silent, yes
also what is your microstepping # set to?
I believe it's set to 64 by default, I did switch to 128 and 256 - but no change
SC should make things quieter. If not.... hmmmmm.... will have to think on that one
It did
If you're not going to run above 100-150mm/s , SC is fine if the noise is disturbing. At higher speeds spreadcycle really is needed.
do some speed tests....20mm/s up through 250 or so..see where is seems to studder or smoothness changes. (will let you understand the limits of the stealthchop mode)
I will eventually install some fans to cool the steppers down and move up to 1.6a run current, but for now I'm wondering if this resonance is due to an error on my side or due to the stepper driver configuration
I can't really say with 2.0 (still on 1.x here) but at 50-100 mm/s teh V-core IS noisy. Do your same test (as the video) but do it st much higher speeds (above 150mm/s try a couple moves (via the console)
such as g1 x0 y0 F3000 then to where ever the other end points are doo the moved at f2000 f4000 f8000 etc up to around F25000
and listen (with stealthchop at 0)
I think this must come from something mechanical somewhere, so i am disassembling in the hope of finding something obviously wrong
Looks like it's the 4028 that is resonating along with the vibrations caused by both steppers running at the same time, it goes away when I press the 4028
foreign-sapphire•2y ago
I think i may have the same issue, the vibration comes from the big rear 4028 fan duct
foreign-sapphire•2y ago
It happens only on 100mm/s movement in both axis, and when printhead is doing circles
Try pushing down on the 4028 fan itself (the blaes, not the housing), there is some play there.