Electronic Focuser Housing for Astro Essentials Crayford Focuser
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Allows for the addition of an electronic focuser to the Astro Essentials range of Crayford Focusers
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- Printables
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- Physics & Astronomy
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- Creative Commons — Attribution — Noncommercial
This project allows an electronic focuser to be added to suitable Astro Essentials crayford focusers. The 3D printed parts consist of the housing/mount for a stepper motor and the 4Tronix stepper motor driver board. The 4Tronix Focus RFU unit is external.
Once completed the focuser can be controlled with the supplied remote control or via a USB cable using the either the 4tronix AstroHub app or you chosen imaging software via ASCOM.
This is the actual crayford focuser that I designed the housing to fit but I would image that any of the other focusers in the range with the same knobs will probably share the same dimensions for the diameter of the draw tube housing and spindle housing.
The housing is designed around a NEMA 11 stepper motor with an attached 5:1 ratio reducing gearbox. Specifically the model OK28STH32-0674AG5.
The parts required in addition to the 3D printed housing and endcap are:
Stepper motor: https://www.ebay.co.uk/itm/168213466853
4Tronix Focus RFU and Driver Board: https://shop.4tronix.co.uk/collections/astro-electronics
4mm x 6mm flexible coupling: https://www.ebay.co.uk/itm/283138679258
I printed the parts using PETG-CF with a 0.2 layer height and 25% gyroid infill.
I have included the Autodesk Fusion archive for the whole model as well as .3mf files for the two parts.