Delta stepper noise when moving with Wantai 42BYGHM810
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Looking for a little advice or any information really.
I'm running a modified Anycubic Predator delta. Compared to stock it has had the following modifications:
- Replaced unbranded X,Y,Z steppers with Wantai 42BYGHM810
- Replaced stock effector with Duet smart effector
- Genuine E3D V6 hotend
- Genuine magballs & arms direct from Haydn
- Bondtech BMG extruder with Capricorn tubing
- Duet WiFi v1.04
The issue I'm having is the steppers are incredibly loud when moving. It's loudest when all 3 towers move at once, IE to bring the nozzle to the bed, but they are by far the loudest part of the entire printer. When performing this conversion, I initially used the stock steppers which were generic 1.8 degree ones, they were significantly quieter.
My config can be found here:
https://github.com/nexx/Anycubic-Predator-Duet/blob/master/sys/config.gThe specs of the steppers are as follows:
- 0.9 degree step angle
- 2.4A rated current
- 1 ohm resistance
- 1.8 mH inductance
- ~47Ncm holding torque
They're also being run at 24.1v.
Reducing the current reduces the noise slightly, but not by much. Increasing micro-stepping to native 256x also helps (I normally run 16x interpolated), but again, they're far from quiet. At this point I'm considering just getting some decent 1.8 steppers, but I know 0.9's are generally better for a delta.
Thanks for reading, I look forward to hearing your thoughts
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@NexxCat
X16 with interpolation should be as silent as x256.
One thing I noticed, that your tower stepper currents seems to be way too much, I use ~800mA in my delta
(Haydn, smart effector, linear rail, etc, so it should be about the same weight. I use Sanyo-Deneki 0.9 deg steppers) -
@denke said in Delta stepper noise when moving with Wantai 42BYGHM810:
I use ~800mA in my delta
he has 2.4A Motors. so 0.8A would be far to little.
there is a chapter about reducing motor noise
https://duet3d.dozuki.com/Wiki/Reducing_Stand-Still_Noise
they are not just for stand still noise. -
@Veti
The OP has a problem is when in high speed not in standstill.I too have 2A steppers, and usually test the setting by moving the head at max intended speed, and increasing the current until it works fine, After that add a comfortable margin, around 25% and that's the final value. I never had any problem with this. I really don't see the point in dissipating anymore power than really needed.
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@denke said in Delta stepper noise when moving with Wantai 42BYGHM810:
@Veti
The OP has a problem is when in high speed not in standstill.i know, but these parameters also influence the movement noise as well.
i made that experience in marlin by having the wrong CHOPPER_TIMING set, which sets the off_time,hysteresis_end and hysteresis_start
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Thank you all for your thoughts on this. I've spent more time this evening trying to track down the exact cause of the noise and I think I've come to the following conclusions:
- The delrin (?) wheel that Anycubic have used on the 3 towers seem excessively noisy. I confirmed this by taking the belt off the stepper and running the carriage up and down the tower by hand.
- The non-clamped side of the belt on each tower seems to vibrate, causing noise. This is regardless of tension.
- The 0.9 Wantai steppers I'm using seem to vibrate above middling speeds, the 1.8 steppers didn't.
I've tried all of the suggestions that were posted. The only real reduction in noise was to significantly drop the stepper current down to 500-750mA. At this current the towers can't move the effector safely. Changing the CHOPCONF register yielded no significant improvement, the default setting was perhaps not the quietest, but there wasn't much in it with the rest of the noise.
At this point I'm considering replacing the carriage wheels & bearings with genuine polycarbonate OpenBuild ones. I've heard they can crack over time, does anyone know if this is true and how best to avoid that as it's not going to be the cheapest to replace all 12 wheels.
In an ideal world, I would seriously consider trying to retrofit Hywin linear rails, but the tower design of the Predator doesn't really loan itself to that idea as they use a customised C-Beam linear rail rather than the stock OpenBuilds design.
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Just wanted to post an update to this.
Spent today replacing all 12 mini V-wheels on my Predator. I can safely say I found the cause of the noise...
Eight out of the twelve wheels I removed had bearings which were severely grating. I determined this by removing the belts from the steppers and being surprised at the noise of the delta tower carriages moving on their own. All of the wheels have been replaced with genuine OpenBuilds Mini-V delrin wheels. I opted for those over the poly-carbonate as they're generally considered better for non-heavy duty applications.
After getting everything back together, my printer is now much quieter. I've also lowered the currents on all 3 axes down to 1600mA. This still seems more than enough, but more time and tweaking will tell.
Before the change, moving the Z faster than 200mm/s would make unbearable noise. I've now tested it up to 400mm/s (with significantly lowered current to prevent back-EMF) and all is A-OK.
Thanks to everyone for your thoughts and help. Hopefully this post will help others in the future
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I've had bad V wheel bearings before as well. I switched to openbuild bearings and had much better results. Get what you pay for I guess.
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