Duet 3 mini 5+ screeching noise when moving stepper motors

deckingman

@ray-r Why are the motor currents for XY and Z only one third of the current for the extruder? We could really do with knowing the specification of the motors.

deckingman

@ray-r Also, having only 10% holding current on 400 mA means it'll be 40mA which will do next to nothing in terms of holding position. Set it to 50% and see if that makes any difference to the sound you hear.

Ray.R

@deckingman I would to provide information on the stepper motors but, unfortunately there is no information on these stepper motors. I already looked online for the model number/manufacturer but there is no info. Ill add a picture of the stepper motor for reference.

Ray.R

@phaedrux So what are my options here? Do i need to replace the stepper motors or is this going to happen with any system that I plug into the Duet 3?

deckingman

@ray-r Are the model numbers the same on the axes motors as the extruder? If they are, then it would reasonably safe to assume that you could make the motor current the same for all of them - i.e. increase it to 1200mA. I'm not saying it will cure your problem, but it might.

Ray.R

@deckingman they are essential with slight variations to there model number. For instance the y stepper motor end in 01N instead of 02N and the Z is 03N. The stepper motor current is set so high on the extruder is because I'm using the orbiter V1.5 and that's there recommended current usage. I will try to up the current and see if that helps.

dc42

@ray-r looking at your config.g file I see that you have the X, Y and Z motors set to the same steps/mm (M92), maximum speed (M203) and acceleration (M201). From photos I find on the web it appears to me that the Cetus 3D is a Cartesian printer with a leadscrew-driven Z axis. If that's the case then the Z axis will almost certainly have a higher steps/mm than X and Y, and it will need a lower maximum speed and acceleration; so I am not surprised that the Z motor screeches when you try to move it.

Ray.R

@dc42 I don't think that is true, or at least not for the one that I have. My printer is on linear rails driven by a belt. That goes for all axis'. I originally modeled my config file off of CNC Kitchen's config for his Cetus, https://youtu.be/WcPyujDF2eU, video for reference. It still gave me the loud noise when operating the stepper motors. I will try to lower the speed and acceleration. Hopefully that works. Thank you all for the help.

nikscha

I also have a Cetus MK2, and I have the same problem.

I just switched from a Duet2 Wifi to a Mini5+, and suddenly the Y motor makes a nasty screetching noise. The other motors are fine, and before, when the Duet wifi was running things there was also no noise.

I've experimented with different current values, with microstepping and interpolation and with tuning stealthchop, but so far nothing helped. Any ideas?

droftarts

@nikscha The Duet 2 WiFi is set to spreadCycle continuously. You could try running it in spreadCycle on the Mini 5+, and to avoid coil whine have it switch to stealthChop when stationary (set changeover speed at below the jerk value). The spreadCycle on the Mini 5+ is different from the Duet 2; they use different drivers, and different versions of spreadCycle.

Are the other axes noisy? What happens if you swap motors over?

Ian