Having a question for anyone who has successfully driven 12v, 0.4a per phase, 1.8 degree NEMA 17 stepper motors (https://www.oyostepper.com/category-6-b ... Motor.html). I have modified an old EQ6 mount with pulleys and belts to mount two stepper motors.
I bench tested the mount for the first time using an Astro EQ that I built using Tom's PCB and pre-programmed chips. The current limit voltage on both drivers (both pukka Polulu) was set to 0.22v.
The problem I am having is that if I set the microstepping to 1/32 and enable the microstepping gearing, the motors will not spin at the GOTO speed.
What happens is that the steppers accelerate to their maximum spin speed, but when they reach max speed they make a high pitched squealing noise and stop moving. I am familiar with the sound of steppers as I already have an EQ5 with a custom pulley conversion.
If I change to 1/16 microstepping, the motors turn fine but the RA motor is noisy when tracking. At 1/32 microstepping, the tracking is very quiet. Am I missing something and would appreciate any pointers. Could it be that I am over-utilizing backlash and making it difficult for the work axis to turn at goto speed? This problem exists with both motors.
Any help or ideas to try would be greatly appreciated.
Thanks,
Welcome to Synthesizer New Zealand, don't forget to register here! Note: This notification disappears after registration.