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how to know if focuser is aligned with main axis?

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#1 georgian82

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Posted 01 October 2020 - 05:34 PM

Hi guys, 

 

I am trying to fix the tilt in my system (I have another thread going on about this) and someone said I should check the focuser is aligned with the main axis. 

 

How exactly do I do this? It looks aligned to me but is there a precise method to make sure the focuser is aligned before I start making adjustments to the tilt adjuster?

 

I have a Meade 70mm f/5 petzval. I did install a Riegel Nstep auto focuser and when I installed the bracket that holds the motor, I had to remove two small screws in the focuser which were replaced with a couple of larger screws in their place (please see image below). I am not sure if this could cause the focuser to fall out of alignment...

 

Thanks a lot!

 

focuser

 

 



#2 sn2006gy

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Posted 01 October 2020 - 05:51 PM

I used a laser collimator that had a barrel to fit in my focuser to center/hold it in the middle. I then made a paper cover for the end of my scope and i folded that paper in half down the middle, opened it up and folded it in half down the other direction and used the center hole to marked by the folds to be where the laser should be. Taped it on the end of my scope.

 

Turned on the laser and i adjusted my focuser screws until the laser was centered

 

that was my "DIY" approach :)

 

sadly, i found out my focuser sagged a bit but at least i got it centered when i replaced the old one with new(er) one.


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#3 georgian82

georgian82

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Posted 01 October 2020 - 07:30 PM

I used a laser collimator that had a barrel to fit in my focuser to center/hold it in the middle. I then made a paper cover for the end of my scope and i folded that paper in half down the middle, opened it up and folded it in half down the other direction and used the center hole to marked by the folds to be where the laser should be. Taped it on the end of my scope.

 

Turned on the laser and i adjusted my focuser screws until the laser was centered

 

that was my "DIY" approach smile.gif

 

sadly, i found out my focuser sagged a bit but at least i got it centered when i replaced the old one with new(er) one.

Thanks for the feedback! I will have to try something like this I guess. 




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