Robin2:
If the purpose of the project is to rotate a camera in sync with the movement of the earth so that you can take a long single exposure without the stars seeming to move then I suspect a stepper motor is not appropriate because they ALL move in jerks.IMHO a very low-geared DC motor with a suitable speed control system would be much more suitable. These small gearmotors are widely available and some have very low gearing.
A stepper motor would be more suitable for a system where you take a separate exposure after every step and amalgamate the images afterwards.
...R
Purpose of project is correct.
DC motor is easy but is it work? I'm not sure about that.
I need 0,25RPM speed but DC motor can't run this slow.
I have to use 2 gearbox or a custom gearbox (which isn't easy) to make it super slow.
Here is a Vixen Polarie inside look.
I'm not an expert but there is 6 wire on motor. It can't be a DC motor right?
If they can make it with stepper motor, I can ;D
---Also;
Is it possible to cut stepper motor shaft?
With metal saw very slowly and gently.