Because I need a more powerful motor, but I don’t know if or how this can be changed
You would need to make some sort of mount to hold the extra weight of the NEMA17 motors. The NEMA17 motors would five you more speed and allow you to use bipolar drivers, there will be some trade offs:
- You will only have 200-400 steps per revolution (though you can decrease this with microstepping)
- You will need another power source for the motors
- They are large and heavy, so as well as adapting for the weight you may need to adapt the gearing for the size of the motor.
You may do better with a smaller NEMA motor:
image from https://www.omc-stepperonline.com/stepper-motors
I’m pretty sure there’s a team in Paraguay who have modified the microscope as you suggest, but I don’t think they are on the forum, the only mention of them was by me. @biodotpe you’ve not tried this, have you?
If you are not getting enough torque out of the 28BYJ-48 motors, is that because you’ve somehow modified the stage? If not, it might indicate something is wrong with the build: they are usually not short of torque, particularly with the default gear ratio.
If you’re looking for more speed, then NEMA steppers would definitely deliver that. NEMA17 will have plenty torque - I did try NEMA11 in the early days, and found that they got so hot they melted the plastic, and even then only just had enough torque.
@r.w.bowman I haven’t tried this yet, but I am curious why you would need more torque. I have tried several brands of 28BYJ-48 motors and their drivers. The main technical issues are related to temperature of components and, indeed, the torque, but I think it’s caused because of a bad quality control from suppliers.
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Thanks, I’ve solved it
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I’m curious how - did you get a NEMA17 in there, or were you able to get it working with the smaller motor? It would be a helpful data point to know which way you went.
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