6 replies to this topic

[Waynerplays]

I bumped the GSO style focuser on my Orion ED80T CF so now the fine focus knob wobbles and spins freely. I’ve had no luck trying to straighten it by carefully bending the knob or adjusting the shaft with the inside focus mechanism. Can anyone suggest an alternative way to true its shaft or whether I’ll have no other option other than finding a replacement focuser?
If it has to be replaced, what dimensions are actually needed to size the replacement in the same price range?

Mine pushes on to the tube and is secured with 3 hex socket screws.
O.D.  is 83mm
I.D. is 73mm
Height of its body is 65mm
Length of the draw tube is 150mm with 90mm travel, and
reaches focus at about 30mm.

What dimensions are actually necessary?

[Martinbruce]

Hey, I just saw this thread now ongoing here at CN. Maybe of help in your situation. https://www.cloudyni.../#entry14074416
 

[Sacred Heart]

I bumped the GSO style focuser on my Orion ED80T CF so now the fine focus knob wobbles and spins freely. I’ve had no luck trying to straighten it by carefully bending the knob or adjusting the shaft with the inside focus mechanism. Can anyone suggest an alternative way to true its shaft or whether I’ll have no other option other than finding a replacement focuser?
If it has to be replaced, what dimensions are actually needed to size the replacement in the same price range?

Mine pushes on to the tube and is secured with 3 hex socket screws.
O.D.  is 83mm
I.D. is 73mm
Height of its body is 65mm
Length of the draw tube is 150mm with 90mm travel, and
reaches focus at about 30mm.

What dimensions are actually necessary?

This is not a rack and pinion focuser??  No gears??   If not and is like a Crayford focuser, steel rod pressed against the tube,  see if you can get the steel rod out.  Take it to a local machine shop, talk to the guy and match it up.

 

Joe

[T1R2]

If one set of screws doesn't do the trick when trying to figure something out to make it more solid. by turning them..just choose a different set and have at it. works for me, that's how I learned to do things. 

[RTLR 12]

You can try to straighten the shaft yourself, but you need to disassemble the focuser. You can also just replace the focuser with this:

 

https://agenaastro.c...pgrade-kit.html

 

Stan

[deSitter]

I bumped the GSO style focuser on my Orion ED80T CF so now the fine focus knob wobbles and spins freely. I’ve had no luck trying to straighten it by carefully bending the knob or adjusting the shaft with the inside focus mechanism. Can anyone suggest an alternative way to true its shaft or whether I’ll have no other option other than finding a replacement focuser?
If it has to be replaced, what dimensions are actually needed to size the replacement in the same price range?

Mine pushes on to the tube and is secured with 3 hex socket screws.
O.D.  is 83mm
I.D. is 73mm
Height of its body is 65mm
Length of the draw tube is 150mm with 90mm travel, and
reaches focus at about 30mm.

What dimensions are actually necessary?

 

If this is the standard GSO (not the linear bearing version), you can get a single- to dual-speed upgrade kit which will include a new axle. However, you'd have to really pound on the axle to bend it. It's steel,.not soft brass. The coarse focus knob is plastic and you may have broken the knob from the central axis.

 

-drl

Edited by deSitter, 19 June 2025 - 09:54 PM.

[Waynerplays]

Thank you all for your responses. I thought I was following this topic and would get email notifications, therefore the late reply. DeSitter appears have a very good option but I’ll have to contact the mfr to know if this conversion will work for me since mine is not a GSO but very similar to it. It is the pin protruding from the course focus knob that is bent.

Stan, you mention straightening the pin myself. How do I go about doing this?

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Edited by Waynerplays, 23 June 2025 - 12:15 PM.