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Mounting a wedge on a Celestron tripod

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#1 ANM

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Posted 29 June 2020 - 04:36 PM

I'm getting the components together to have a C90 Astro equatorially mounted on a Celestron wedge and tripod. I have the Celestron tripod and a wedge, but I'm not sure if the wedge is Celestron or not though it fits the tripod. The bolt holes in the wedge are slotted to facilitate polar alignment. There is a threaded hole in the center of the wedge that looks to be 3/8" NF — it looks like there should be a bolt/pin threaded into that hole but with the end of the bolt turned down to a "pin" with a smooth diameter of about 1/4". I think the 1/4" "pin" goes into the unthreaded center hole in the top of the tripod.

 

This is the tripod and wedge:

IMG_1523.jpeg

 

Here's a closeup of the center hole:

IMG_1521.jpeg

 

Anyone know what the center bolt/pin/whatever is supposed to look like?

 

Thanks!


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#2 deepwoods1

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Posted 29 June 2020 - 04:46 PM

You’re good with the three. Good question though, as I don’t know why there’s a middle. We’ll find out soon I’m sure! I hope you enjoy your C90 Astro! A rare bird!


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#3 Kasmos

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Posted 29 June 2020 - 05:35 PM

That wedge is for the C8 and diecast large base C5. It's not designed for a C90 as it's tilt plate base is too large.

It might work with new holes drilled.

Here's a C90 wedge

C90-Wedge.jpg

Noted by the big slot in tilt base

 

BTW, not sure what the center hole is for,  never used it.


Edited by Kasmos, 29 June 2020 - 05:40 PM.


#4 ANM

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Posted 29 June 2020 - 06:16 PM

That wedge is for the C8 and diecast large base C5. It's not designed for a C90 as it's tilt plate base is too large.

It might work with new holes drilled.

Here's a C90 wedge

attachicon.gifC90-Wedge.jpg

Noted by the big slot in tilt base

 

BTW, not sure what the center hole is for,  never used it.

Yes but I have an adapter plate to go from C90 to C8 so I'll be okay. I wanted the C8 wedge since I also want to find an early C8 or C5 — I haven't decided which yet.



#5 davidmcgo

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Posted 29 June 2020 - 07:22 PM

Celestron tripods never came with any center pin I’ve seen although the tripod and wedges had the hole.
 

Dave


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#6 ANM

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Posted 29 June 2020 - 08:12 PM

Maybe the hole was to attach to a different style tripod? Something with the threaded center bolt like many tripods use...

 

The C90 with the adapter plate between it and the wedge:

IMG_1525.jpeg

 


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#7 Don W

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Posted 29 June 2020 - 08:47 PM

David is correct. Older Celestron wedges do not have  a threaded center hole. Meades do.



#8 Kasmos

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Posted 29 June 2020 - 10:17 PM

After I logged off I thought of those adaptor plates. I'm guessing it's the ones on ebay.



#9 ANM

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Posted 30 June 2020 - 10:15 AM

After I logged off I thought of those adaptor plates. I'm guessing it's the ones on ebay.

Yes that's where I got it, and I also bought the wedge from him. I think he has one of the adapters left. It is a very nicely machined and finished part.



#10 Kasmos

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Posted 30 June 2020 - 02:58 PM

It's a good solution if you have several models and don't want to store the extra gear.



#11 ANM

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Posted 02 July 2020 - 10:32 AM

As I was doing this I realized that the OTA can be reversed in the saddle.

 

Here's the (almost) finished project:

IMG_1530.jpeg

 

With the saddle reversed everything clears the Astro mount

IMG_1532.jpeg

 

 


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#12 ANM

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Posted 02 July 2020 - 10:37 AM

David is correct. Older Celestron wedges do not have  a threaded center hole. Meades do.

Does that make this a Meade wedge then? I just kinda assumed since it fit the tripod it must be a Celestron...


Edited by ANM, 02 July 2020 - 11:26 AM.


#13 deepwoods1

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Posted 02 July 2020 - 11:57 AM

My Celestrons have the hole. The only Meade I have has a larger hole.



#14 ANM

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Posted 02 July 2020 - 01:39 PM

My Celestrons have the hole. The only Meade I have has a larger hole.

My wedge has a central hole that is threaded 3/8"-16tpi National Coarse. Is your Celestron wedge drilled and threaded? The tripod has an unthreaded hole that is aligned with the hole in the wedge but is smaller, .283 inch.

 

P.S.: I sent it too early. The .283 inch drilled hole in the center of the tripod is for a 1/4"-20tpi bolt to attach the C90 Astro mount to the tripod. The bolt goes through the hole from below and into the center axis of the Astro mount — the C90s usually have a red sticky dot covering the hole.


Edited by ANM, 02 July 2020 - 01:52 PM.


#15 houndsbourgh

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Posted 02 July 2020 - 07:19 PM

Sounds like you pretty much have it figured out. The center hole on the tripod is to mount the C90 Astro in a alt-az configuration. The center 3/8" hole as far as I remember (early 80s) is to mount the wedge on a surveyors tripod. I have also seen many home made accessories use it through the years. Here's mine with a eyepiece holder.

Attached Thumbnails

  • 62202018323.jpg

Edited by houndsbourgh, 02 July 2020 - 07:25 PM.

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#16 ANM

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Posted 02 July 2020 - 08:23 PM

Sounds like you pretty much have it figured out. The center hole on the tripod is to mount the C90 Astro in a alt-az configuration. The center 3/8" hole as far as I remember (early 80s) is to mount the wedge on a surveyors tripod. I have also seen many home made accessories use it through the years. Here's mine with a eyepiece holder.

The eyepiece holder is a cool idea!




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