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What Are These Focuser Grub Screws For?

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#1 Orion68

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Posted 30 July 2021 - 05:02 PM

Focuser grub screw

 

The scope is a 6" Apertura F5 Newtonian. The focuser is made by GSO, I believe. Single speed.

 

Not sure what these little grub screws in the base of the focuser are for. There are two of them. One on the base of the focuser that faces the primary and one on the opposite side of the focuser.

 

I was hoping it might be for shifting the axis of the focuser, but don't think that's it. 

 

Any ideas?

 


Edited by Orion68, 30 July 2021 - 05:11 PM.


#2 deepwoods1

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Posted 30 July 2021 - 05:12 PM

I would think that the focuser is offer on several sized base plates. I would think that one could use it to rotate the focuser as well. A link to Agena's website that discusses it.

https://agenaastro.c...ngle-speed.html


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#3 MisterDan

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Posted 30 July 2021 - 05:15 PM

The main housing is modular and is adapted to different sized and types of bases and flanges (i.e. Newtonians, refractors, & SCTs).  The screws engage an annular groove (ala "dovetail") at the bottom of the housing.

 

Best wishes.

Dan


Edited by MisterDan, 30 July 2021 - 05:17 PM.

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#4 Jon Isaacs

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Posted 30 July 2021 - 06:24 PM

As Dan and DW said, they hold the focuser to the adapter plate.  Loosen them and you can rotate the focuser.  Tighten them when you are finished.. :)

 

Jon


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#5 Orion68

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Posted 30 July 2021 - 09:38 PM

Thank you all, appreciate the info.




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