Unipolar focusing stepper motor 12V with built-in 1:120 reduction gearbox that gives resolution 5760 steps per revolution that correspond to about 3 micrometers per step at standard Crayford focuser. This resolution is enough to set focus in instruments with focal ratio f/3 and slower. The motor is equipped with RJ 6 pin socket and the cable ended with a DB9 or RJ plug. This is compatible with the Robofocus standard, which can be powered by many different controllers – AstroLink, AstroHub, Moonlite, USB Focus, and many others. Motor torque is enough to work with medium and large Crayford focusers and R&P focusers (up to 3″) with load up to 4-5kg (like a monochromatic camera with filter wheel and OAG). Gears are all metal.
To rotate the microfocuser shaft version with 1:10 reduction should be used.
- voltage – 12V DC
- current – 0.4A
- resolution – 5760 steps per revolution
- step size – about 3 micrometers for standard Crayford focuser
- torque – 40 Ncm
- maximum speed – 250 steps/s
- electrical connection – RJ 6 pin socket, RJ – DB9 cable, Robofocus compatible
You can read more about focuser motor solutions at https://astrojolo.com/astrolink-4-0-mini/focusing-stepper-motor-solutions/