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Parker-style tripod and extension

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#1 herrointment

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Posted 07 February 2013 - 12:20 PM

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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#2 herrointment

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Posted 07 February 2013 - 10:22 PM

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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#3 herrointment

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Posted 07 February 2013 - 10:27 PM

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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#4 herrointment

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Posted 07 February 2013 - 10:30 PM

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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#5 herrointment

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Posted 07 February 2013 - 10:38 PM

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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#6 herrointment

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Posted 07 February 2013 - 10:39 PM

The photo....

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#7 herrointment

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Posted 07 February 2013 - 10:41 PM

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

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#8 herrointment

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Posted 07 February 2013 - 10:49 PM

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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#9 herrointment

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Posted 07 February 2013 - 10:51 PM

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

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#10 herrointment

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Posted 07 February 2013 - 10:53 PM

A shot of the tripod in various poses...

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#11 herrointment

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Posted 07 February 2013 - 10:54 PM

Holding up the 8 SE....

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#12 herrointment

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Posted 07 February 2013 - 10:55 PM

The CPC 11....

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#13 herrointment

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Posted 07 February 2013 - 10:56 PM

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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#14 plyscope

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Posted 07 February 2013 - 11:14 PM

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

#15 Dick Parker

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Posted 08 February 2013 - 08:13 AM

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

Dick Parker

#16 herrointment

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Posted 08 February 2013 - 11:54 AM

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

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#17 herrointment

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Posted 08 February 2013 - 11:55 AM

More...

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#18 herrointment

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Posted 08 February 2013 - 12:03 PM

Again....

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#19 herrointment

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Posted 08 February 2013 - 12:08 PM

And finally....

Thanks for looking!

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#20 btb

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Posted 08 February 2013 - 03:35 PM

:goodjob: 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!

#21 Scanning4Comets

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Posted 09 February 2013 - 04:24 AM

Exceptional workmanship! :waytogo:

Cheers,

#22 Dave O

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Posted 09 February 2013 - 05:51 AM

That really is very nice! Thanks so much for sharing. :)

#23 herrointment

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Posted 09 February 2013 - 06:39 AM

It is a great design. The CPC doesn't know it's not on the OEM tripod and the old C6R with a Orion Sky View Pro mount has a 2 second damping time which I didn't believe possible.

And of course, looking good has its own rewards!

#24 hottr6

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Posted 09 February 2013 - 10:43 AM

I can see where you ran out of copper tubing and had to use a nipple to make up for it. Clearly flawed, and you'll have to make another tripod. Send that old firewood to me.... I'll even pay for shipping. ;)

Damn. Wish I was 10% as capable when working with wood.

#25 Kunama

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Posted 14 March 2013 - 06:23 PM

That's just beautiful !!!






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