Old 03-10-2018, 07:16 AM
garymck (Gary)
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Join Date: Aug 2005
Location: Geelong
Posts: 704
DIY Focuser Rotator

not sure whether to put this here or in the ATM section, but since I'll be using it for imaging thought here would be OK.

I'm currently building a motorised focuser rotator for my Esprit 100mm. The inspiration came from this web site:


The software is Ascom compatible, free, and the electronics are Arduino.

Cost so far:
$225 for secondhand Tak CAA (thanks LewisM)
$50 for the stepper
already had the Arduino stuff, but say about $12
$65 for aluminium - had to buy billets as tubing is not available in required size
A few cents for 3d print materials for a ring gear
$20 for timing belts and pulleys for the motor

Also have to buy lunch for my machinist friend who did the work making adapters (scopey - Les)

At this stage the adapters are made, electronics builtt and tested. Ring gear fitted. Currently waiting for timing pulleys/belt to arrive from Banggood.

Kevin, the designer and web page owner is a terrifically helpful guy. After finishing the adapters, I contacted him yesterday requesting a different ring gear size. He had it done and the stl file in my mailbox in a couple of hours.

If there is any interest, I'll provide adapter details and follow up pics on completion after the pulleys arrive.


see Pic attached
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Old 03-10-2018, 07:42 PM
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jwoody (Jeremy)
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Join Date: Aug 2011
Location: Ormeau Hills, Australia
Posts: 326
Gday Gary
That looks good
I made one of Kevin's rotators also, very good indeed.
Good luck
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