Low power focuser motor with 1:20 reduction

199.00  incl. Vat

High-resolution low torque focuser motor for focusers with additional microfocusing gearbox. Cable included.


Unipolar stepper motor 12V with built-in 1:20.35 reduction gearbox that gives resolution 976.8 steps per revolution that correspond to about 1.9 micrometers per step at standard 6mm shaft diameter Crayford focuser with 1:10 reduction gearbox. The motor is designed to rotate the microfocuser shaft in telescopes with a focal ratio of f/3 or slower. The motor is equipped with an 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 the medium, large, and very large Crayford focusers and R&P focusers (up to 4″) with a load of up to 7-8kg.

To rotate the main focuser shaft motor with 1:120 reduction should be used.

Technical data:

  • motor diameter: 35mm
  • weight: 180g
  • voltage – 12V DC
  • maximum current – 400mA
  • resolution – 976.8 steps per revolution
  • resolution: about 1.9um per step for a standard 6mm diameter shaft focuser
  • maximum speed – 400 steps/s
  • electrical connection – RJ 6 pin socket
  • cable with RJ6 plug or DB9 plug available
  • recommended settings: 200mA current, 300 steps per second speed

You can read more about focuser motor solutions at https://astrojolo.com/astrolink-4-0-mini/focusing-stepper-motor-solutions/



Additional information

Weight 0.2 kg
Focusing cable

no, 0.3m, 0.5m, 0.8m, 1m, 1.5m, 2m, 3m

Controller side cable plug



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