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Equipment Discussions >> ATM, Optics and DIY Forum

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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Parker-style tripod and extension
      #5666997 - 02/07/13 12:20 PM Attachment (123 downloads)

I started this project in mid-June if I recall correctly. It is finally done and I thought I'd post the results as things appear to have worked out.

I've built a few different tripods but wanted to try one in the "Parker style" as I thought the design really hit on all the marks. Here's a LINK to the CN page that got me interested...the post I'm referring to is about 3/4 of the way down the page.

I'll begin by saying that my selection of red oak, and curly red oak specifically is not the ideal wood to use in a tripod. It has a tendency toward brittleness, fracturing with the figure....but it was at hand when I started at 2 AM back in June. Ash would be best and it is currently plentiful and cheap (if available locally) due to the Emerald Ash Borer.

My other deviation in material was the use of a 1" copper pipe instead of iron w/flange. This was another "material at hand" decision and it made for some interesting design decisions as I'll detail later.

Gotta do some running this afternoon so I'll start with a teaser pic of the disassembled tripod parts....more to follow.


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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Parker-style tripod and extension new [Re: herrointment]
      #5667972 - 02/07/13 10:22 PM Attachment (89 downloads)

To use the copper pipe I decided to bury it in wood using the lathe to shape and bore out the hole. I wanted a centering pin for the Celestron CPC and SE mounts so a threaded rod was run the length of the copper pipe. Plastic discs were made to push outward on the copper in the wooden flange to secure the pipe and a cap and nut on the other end provide tension. A copper coupler was used because I had it...but I had to file saw teeth into it so it could bore its own hole as I lacked a Forstner bit the right size.

No idea if this arrangement is strong enough but it looks cool.

This barely fit on the lathe. Best to get everything else done on the head before attaching the wooden flange as it gets in the way. I used the drill press to place all the threaded inserts in the project as I can't get them to seat straight any other way.


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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Parker-style tripod and extension new [Re: herrointment]
      #5667981 - 02/07/13 10:27 PM Attachment (70 downloads)

I took my time getting the legs attached so that they fold up correctly with nothing too far out of alignment.

The sliding discs work well...the copper pipe is immobile with a little tension. Not pictured are 1" thick centering discs that were also placed in the pipe to help center the threaded rod.


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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Parker-style tripod and extension new [Re: herrointment]
      #5667984 - 02/07/13 10:30 PM Attachment (54 downloads)

That's an RC wheel above placed as a stop for the legs when folded.

Up next a shot of the top of the head.


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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Parker-style tripod and extension new [Re: herrointment]
      #5668002 - 02/07/13 10:38 PM Attachment (51 downloads)

I wanted a smooth sliding spreader hub. This is what I ended up with.

Two cylinders were turned on a faceplate, bored for a UHMW plastic "doughnut" that would ride the pipe and counter bored for the pipe to pass through. The ends of the two cylinders were brought together, glued up and caps made to hold the doughnuts in place.

I used a mortiser to make the slots for the attachment ears for the spreader bars.

First a detailed diagram then a photo.


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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Parker-style tripod and extension new [Re: herrointment]
      #5668005 - 02/07/13 10:39 PM Attachment (59 downloads)

The photo....

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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Parker-style tripod and extension new [Re: herrointment]
      #5668007 - 02/07/13 10:41 PM Attachment (54 downloads)

A shot of the whole works put to use....

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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Parker-style tripod and extension new [Re: herrointment]
      #5668025 - 02/07/13 10:49 PM Attachment (36 downloads)

At all the hinge points in the project, including the leg pivots at the head I included space to place fiber washers in the mix. They provide nice feedback and resistance when tightening things up.

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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Parker-style tripod and extension new [Re: herrointment]
      #5668031 - 02/07/13 10:51 PM Attachment (42 downloads)

A photo of the legs folded against the RC wheel....

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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Parker-style tripod and extension new [Re: herrointment]
      #5668036 - 02/07/13 10:53 PM Attachment (51 downloads)

A shot of the tripod in various poses...

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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Parker-style tripod and extension new [Re: herrointment]
      #5668038 - 02/07/13 10:54 PM Attachment (51 downloads)

Holding up the 8 SE....

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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Parker-style tripod and extension new [Re: herrointment]
      #5668040 - 02/07/13 10:55 PM Attachment (40 downloads)

The CPC 11....

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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Parker-style tripod and extension new [Re: herrointment]
      #5668044 - 02/07/13 10:56 PM Attachment (42 downloads)

Can't forget the extension for the refractor!

The extension was a fun build. I'll post some photos of it tomorrow.


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plyscope
Pooh-Bah


Reged: 11/23/06

Loc: Perth, West Australia
Re: Parker-style tripod and extension new [Re: herrointment]
      #5668080 - 02/07/13 11:14 PM

Good job! Thanks for sharing the pictures.
A very practical design.


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Dick Parker
scholastic sledgehammer
*****

Reged: 08/17/07

Loc: Tolland, CT and Chiefland, FL
Re: Parker-style tripod and extension new [Re: herrointment]
      #5668446 - 02/08/13 08:13 AM

Oh my!. What beautiful woodwork. Nice job. Thanks for sharing

Dick Parker


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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Parker-style tripod and extension new [Re: Dick Parker]
      #5668838 - 02/08/13 11:54 AM Attachment (36 downloads)

The extension uses a wood tube from a failed 5" Surplus Shed project.

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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Parker-style tripod and extension new [Re: herrointment]
      #5668841 - 02/08/13 11:55 AM Attachment (34 downloads)

More...

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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Parker-style tripod and extension new [Re: herrointment]
      #5668854 - 02/08/13 12:03 PM Attachment (36 downloads)

Again....

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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Parker-style tripod and extension new [Re: herrointment]
      #5668863 - 02/08/13 12:08 PM Attachment (45 downloads)

And finally....

Thanks for looking!


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btb
sage


Reged: 07/07/06

Loc: Northeast Indiana
Re: Parker-style tripod and extension new [Re: herrointment]
      #5669286 - 02/08/13 03:35 PM

Hope you have a solar scope to use during the day that is to nice to use at night so no one can see it!

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