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ZWO EAF won't fit my focuser! Even with a bracket designed for it : (


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I waited 2 months for my ZWO EAF to arrive and now that it has, it doesn't fit, even with the 3D printed bracket FLO recommended to me!

I tried to fit the bracket any number of ways, but the only way I could think of that made sense was fitting the bracket as in the picture below, leaving the motor to connect to the fine control. However the bracket only barely fit on, and wouldn't fit at all if the focuser's cover was fitted. When finally in a position where it would be able to accept the motor, it was covering the threaded hole that lets me adjust the level of tightness between the roller and the focuser barrel! I need that applying some tension to stop the tube falling out let alone avoid sag.

 

So I changed strategy, and tried to install the motor using the supplied bracket and affix it to the focuser on the normal speed end. However this also occludes the tension and locking threaded holes, so I am none better off!

2 months of waiting and it seems I am still some way off of being auto-focused! : (

Anyone know what I should be doing? This is the TS 2" crayford focuser supplied with the TS-PHOTON 8" F4 Newtonian.

Image below shows how I tried to install the motor with default bracket, and also the 3D printed bracket in the orientation I tried to install it in before, for reference.

As usual, instructions would have been amazing from the bracket manufacturer but none are to be found!

Screenshot_20220630_232258.png.d9e58d4bef4cc1f9a7bd90765116230f.png

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Posted (edited)

The issue with the 3D printed bracket should be sorted out with FLO, they are usually very helpful!

Have you seen this list of focuser fitments? eaf-support-list Must be a nightmare when every focuser on the market has a different pattern of holes.

However if you have: 

9 hours ago, pipnina said:

I need that applying some tension to stop the tube falling out let alone avoid sag

then that should be sorted out first. No off the shelf electronic focuser is going to work optimally if you have the tension screwed up tight. I have three scopes with rack and pinion focusers and they all perform faultlessly with the EAF.

Edited by Len1257
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These should fit the normal focus side and when fitted the focus is locked solid and cannot be moved manually so there should be no need to be able to adjust focus tension anyway. That's on a refractor but I assume the principle is the same regardless.

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12 hours ago, scotty38 said:

These should fit the normal focus side and when fitted the focus is locked solid and cannot be moved manually so there should be no need to be able to adjust focus tension anyway. That's on a refractor but I assume the principle is the same regardless.

This was the issue. I had the bracket on the wrong way around! I guess everything is easier after a good sleep and not being tired any more lol.

I got it all sorted now, and I don't put a huge amount of tension on the focuser, just enough to ensure the rotating metal shaft and the focuser barrel have good grip and the sag is corrected. It's still very fluid and doesn't take effort to adjust by hand, so hopefully the EAF should handle it all fine.

Gotta wait for another night to put it to the test though!

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