60mm/s and >1300ma stepper current causes vibrations

Aussiephil

Going up to the 0.6mm nozzle i've had to drop my speeds down into the 60 to 80 mm/s range to ensure good layer bonding at the current lowish ambient temperatures in my garage.
This has exposed that the Nema23's running on the DuetWifi get noisy and vibrate as the current supplied goes up. Really noisy and vibrations during certain moves at 2000mA and getting quieter as current is reduced.
At 1300mA they are quiet and vibration free.

Note this was only apparent during certain moves around the bed and wasn't constant.

I never noticed this with the 0.8.5 board so the question is, could this be related to the interpolation and what's the easiest way to test it? I assume turn it off but would like to check various things if it helps.

dc42

I have heard that Nema 23 motors vibrate much more than Nema 17. Have you tried the same motor on the Duet 0.8.5?

To turn off microstep interpolation use the M350 command, see http://reprap.org/wiki/G-code#M350:_Set_microstepping_mode. You can try increasing microstepping to x32, x64 or greater as well.

Aussiephil

@dc42:

I have heard that Nema 23 motors vibrate much more than Nema 17. Have you tried the same motor on the Duet 0.8.5?

Yep, this is the machine that started life with the 0.8.5 board.
I do not recall noticing this issue with that board however i also wasn't printing a slow as I am atm as i sort out print speeds with the 0.6mm nozzle.
It would seem that the speed combinations are crossing over the mid band resonance of the nema23's.
One poitn though is I may not have noticed it with the old board due to the greater noise in general….. the DuetWifi is just so quiet.

@dc42:

To turn off microstep interpolation use the M350 command, see http://reprap.org/wiki/G-code#M350:_Set_microstepping_mode. You can try increasing microstepping to x32, x64 or greater as well.

Thanks for that, i'll try a few of those tomorrow after this print finishes.

Cheers and Thanks Dave