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defrag
newbie


Reged: 10/31/12

4SE Focus knob fell off!!!
      #5535235 - 11/23/12 10:47 AM

Well after trying to get focus doing some eyepiece projection, I managed to twist the knob off the focus bar and now it won't stay on naturally this happened at night and the knob rolled under some garden pots and tok ages to find. Needless to say my wife found this very amusing watching me trying to find it.

I don't want to glue it on as I may need to take the back off at some point. Anyone else had this? I was hoping it would somehow clip back on the bar, but alas nothing for it to grip on.

Anyone had the back off their nexstar and got the focus knob to stay fixed on the bar after refitting????


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Tel
Postmaster
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Reged: 03/31/06

Loc: Wallingford England
Re: 4SE Focus knob fell off!!! new [Re: defrag]
      #5535279 - 11/23/12 11:20 AM

Hi Defrag,

Wecome to CN and to this forum

Sorry to hear of your misfortune with the 4SE's focusing knob. I'm not familar with this particular Nexstar, but it looks as if the knob's retained by a grub screw which might have gone awry.

Perhaps the series of images contained in this link attributable to our CN friend and colleague Hernando, might help ?

https://picasaweb.google.com/102580420101460355962/Nexstar4SEDisassembly#

Best regards,
Tel


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defrag
newbie


Reged: 10/31/12

Re: 4SE Focus knob fell off!!! new [Re: Tel]
      #5535368 - 11/23/12 12:13 PM

Ecellent set of pics! I shall have another play tonight and report back.

This is my first scope in about 35 years, loving the night sky once again.

Many thanks


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Peter9
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Reged: 10/30/08

Loc: Yorkshire - Born & Bred
Re: 4SE Focus knob fell off!!! new [Re: defrag]
      #5535556 - 11/23/12 01:47 PM

Hi Defrag and welcome to the Nexstar forum.

Nice to hear of your renewed interest in the night sky.

Hope the pics our Tel pointed you to prove to be helpful and that your repair goes well.

Regards. Peter.


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Tel
Postmaster
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Reged: 03/31/06

Loc: Wallingford England
Re: 4SE Focus knob fell off!!! new [Re: defrag]
      #5535569 - 11/23/12 01:54 PM

Thanks to Hernando ! I'm just the messenger boy ! (or hoarder of anything I think might be useful) !

Hope you get it fixed.

Best regards,
Tel


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defrag
newbie


Reged: 10/31/12

Re: 4SE Focus knob fell off!!! new [Re: Tel]
      #5540183 - 11/26/12 11:53 AM

Repair done!!!

So it looks like the grub screw came loose. Which makes sense as there was some travel when turning the knob.

Anyway, as per the pictures, the rubber outside covers a metal tube that has the grub screw. In my case the rubber sleve and the metal tube had come away in one piece and once I managed to prise the tube out, refit and tighten up the grub screw all is well with the world, apart from the rubber cover being a bit looser.

Thanks for the help - another crisis averted


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Maverick199
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Reged: 02/27/11

Loc: India
Re: 4SE Focus knob fell off!!! new [Re: defrag]
      #5540198 - 11/26/12 12:07 PM

Glad to hear that. Nexstar forums, one stop shop for everything.

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