david laine

Hi Robert, I first tried with a NEMA14, from Astrosyn: https://www.astrosyn.com/product/my14hy7-1-astrosyn-stepper-motor-nema-14 Then then I took a NEMA 17 from Adafruit: https://www.adafruit.com/product/324 Both of them seem to have not enough torque to move my focus train.

Hello, I have tried three different stepper motors and none can move my focus train. I built the DRV8825 HW203 version using my own circuit board with the myFP2F_DRV8825HW203_330 firmware. First I tried a MY14HY7-1 stepper motor 1.8° 50 mNm, 0.40A; then an Adafruit NEMA-17, 200 steps/revs, 350mA. And finally a NEMA 17, 1.6A, high torque, knowing the amps were too high. My scope is a William Optics Zenithstar ED80II. All the stepper motors could not move my train and seem to have too little torque...

Hi Robert, no need to apologies, there are no stupid questions when toubleshooting! The stepper moves in both directions, without hickups when removed from the focuser. Regards, David

Thank you Robert for your answer, Yes, the stepper is connected to 12 Volts and of course I adjusted the amps on the DRV8825 and my focus screw is loose, I also tried in all the step mode settings. I will try to make a pulley system on the 1:10 knob this week and will let you know what the outcome is. regards, David

Hello, I made my FP2 pro using a custom prototype board and the myFP2F_DRV8825HW203_330 firmware. I tried three different stepper motors, th efirst was a nema 14 MY14HY7-1 Stepper Motor 1.8° 50 mNm, 0.40A, the second a Adafruit Nema17 - 200 steps/rev, 12V 350mA, the last one (knowing the amps are too high a Nema 17, high torque, 1.6 A. All stepper motors could not move my focus train using direct drive on my Zenithstar ED80II focuser. All steppers seem to be not strong enough. What am I doing wr...

Hello, I made my FP2 pro using a custom prottype board and the myFP2F_DRV8825HW203_330 firmware. I tried three different stepper motors, th efirst was a nema 14 MY14HY7-1 Stepper Motor 1.8° 50 mNm, 0.40A, the second a Adafruit Nema17 - 200 steps/rev, 12V 350mA, the last one (knowing the amps are too high a Nema 17, high torque, 1.6 A. All stepper motors could not move my focus train using direct drive on my Zenithstar ED80II focuser. All steppers seem to be not strong enough. What am I doing wro...