ASI EAF gets stuck

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Kaustav
Posts: 217
Joined: Fri Dec 03, 2004 3:24 pm
Location: London, UK
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ASI EAF gets stuck

Post by Kaustav »

I'm trying to get my ASI electronic auto focuser to work my Williams Optics 110mm Megrez refractor, which has a two speed focuser. However, when calibrating the focuser via the app, i.e. setting position 0 and the other end, as the focuser is moving out it gets stuck at about position 4000 (roughly 2cm out from the fully closed position). Have you encountered this issue and can you provide any advice as to what I can do to get it working?

Regards,

Kaustav
Kaustav Bhattacharya
>> http://kaustav.uk.com/unisphere/ - An online magazine about Astronomy, Science, Social Media and Society.
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Kaustav
Posts: 217
Joined: Fri Dec 03, 2004 3:24 pm
Location: London, UK
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Re: ASI EAF gets stuck

Post by Kaustav »

Managed to get it working by ensuring the flat part of the shaft on the EAF binded with the screw in the focuser. Previously the screw was binding to the curved part of the shaft. Now I'm getting smooth motion both ways, although occasionally I'm hearing a grinding sound as the focuser rotates and I notice the dual speed focus knobs stop turning even when the focuser is operating. Maybe I need to tighten the screws on the dual focuser end more firmly.
Kaustav Bhattacharya
>> http://kaustav.uk.com/unisphere/ - An online magazine about Astronomy, Science, Social Media and Society.
>> Follow me on Twitter @jupiterorbit
jeff.stevens
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Re: ASI EAF gets stuck

Post by jeff.stevens »

Hi Kaustav, hopefully someone will be able to comment who has experience of this particular setup.

I have a William Optics 66mm refractor, and had a lot of trouble with my focuser last year. There's a small Teflon strip that had worn out, meaning the focuser slipped dramatically. By carefully dissembling, replacing it with an identical sized strip cut from a plastic milk carton, and carefully reassembling, I was able to get the friction back to normal.

Best wishes, Jeff.
Kaustav
Posts: 217
Joined: Fri Dec 03, 2004 3:24 pm
Location: London, UK
Contact:

Re: ASI EAF gets stuck

Post by Kaustav »

Got it all working now. There's very little margin for error in how the screws holding the focuser in position are tightened and how they're bound to a surface. Through trial and error I now have a stable setup. Only remaining issue is it has been raining or cloudy 100% of the time since fitting this focuser. Bring on the anti rain and cloud dance.
Kaustav Bhattacharya
>> http://kaustav.uk.com/unisphere/ - An online magazine about Astronomy, Science, Social Media and Society.
>> Follow me on Twitter @jupiterorbit
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