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Need "artistic" help to design my dob base

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#1 brebisson

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Posted 07 December 2021 - 01:18 AM

Hello,

 

I am working on a 200f5 dobson for a friend (female) of mine.

I have completed the OTA, but I am stuck on the base design :-(

 

As you can see, the "design" is mainly horticultural (tree of life... I did, after all, specify that is was for a female friend, isn't it:-)...

so, I would like to stay in the same register for the base...

The base will be made with the same white wood (maple) as the altitude bearings (see picture)

 

 

If you have any design idea that I could use, I would be very thankful! (The base will need to be around 45 to 50cm high.)

 

 

Here is a picture of the OTA

IMG_20211205_092535_5 - Copy.jpg

 

And the boards that I will be using for the base :-)

IMG_20211020_183106_5 - Copy.jpg

 

Cyrille


Edited by brebisson, 07 December 2021 - 01:19 AM.

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#2 Joe1950

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Posted 07 December 2021 - 01:36 AM

Very nice work!

It would be really unique to make the base round, like a tree stump. Where the scope goes into the base at higher altitudes have the stump appear opened, as some do.

I can see it, just hard to describe. Just a thought. Whatever you do will be excellent, I’m sure!


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#3 brebisson

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Posted 07 December 2021 - 02:27 AM

Hello,

 

I googled "tree stump" on google and created these 2 images...

Is that what you had in mind?

(The 2nd one is a stool that I placed upside down)

 

Cyrille

 

IMG_20211205_152253_2 - Copy.jpg


Edited by brebisson, 07 December 2021 - 02:27 AM.

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#4 Joe1950

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Posted 07 December 2021 - 12:27 PM

Very good! That really keeps to the theme and style. It may be extra work, Cryille, but you have the skill to do it.



#5 Bob4BVM

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Posted 07 December 2021 - 01:42 PM

Hello,

 

I am working on a 200f5 dobson for a friend (female) of mine.

I have completed the OTA, but I am stuck on the base design :-(

 

As you can see, the "design" is mainly horticultural (tree of life... I did, after all, specify that is was for a female friend, isn't it:-)...

so, I would like to stay in the same register for the base...

The base will be made with the same white wood (maple) as the altitude bearings (see picture)

 

 

If you have any design idea that I could use, I would be very thankful! (The base will need to be around 45 to 50cm high.)

 

 

Here is a picture of the OTA

attachicon.gifIMG_20211205_092535_5 - Copy.jpg

 

And the boards that I will be using for the base :-)

attachicon.gifIMG_20211020_183106_5 - Copy.jpg

 

Cyrille

Stunning work !!!

You are asking us mortals for   ... artistic ideas ?


Edited by Bob4BVM, 07 December 2021 - 01:43 PM.

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#6 rhetfield

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Posted 07 December 2021 - 02:25 PM

Hello,

 

I googled "tree stump" on google and created these 2 images...

Is that what you had in mind?

(The 2nd one is a stool that I placed upside down)

 

Cyrille

 

attachicon.gifIMG_20211205_152253_2 - Copy.jpg

I think the one on the right would be easier to implement.  Friend will be the life of the star party.


Edited by rhetfield, 07 December 2021 - 02:27 PM.

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#7 Don H

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Posted 07 December 2021 - 05:48 PM

Have you seen Norman Fullum's scopes?

 

https://www.google.c...0&bih=749&dpr=1


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#8 lonn

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Posted 07 December 2021 - 10:23 PM

More picssmile.gif



#9 rfiol

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Posted 08 December 2021 - 10:35 AM

Have you seen Norman Fullum's scopes?

 

Wow!  I love the moon-shaped alt bearings.  


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#10 Neanderthal

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Posted 08 December 2021 - 01:39 PM

Coolest thing I've seen in awhile, very nice brebisson! waytogo.gif


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#11 impreza276

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Posted 29 December 2021 - 08:41 PM

I'm thinking a carved 2D hand or hands

 

set-hand-holding-3d-circle-card-26709480



#12 brebisson

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Posted 03 January 2022 - 11:25 AM

Hello,

 

Well, here is the finished product!

 

Sorry for the bad picture, I will try to post a better one later on...

The final owner decided to have a design that looks like a Irish harp, with the floral pattern.

I am now working on a wood view finder...

 

IMG_20211221_204925_9.jpg

 

I will post pictures of the details later one, once I have time to do so.

 

Cyrille


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#13 impreza276

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Posted 03 January 2022 - 06:48 PM

That is absolutely beautiful! Looking forward to the details..



#14 brentelgeuse

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Posted 03 January 2022 - 07:09 PM

Hello,

 

Well, here is the finished product!

heart.png



#15 FlyingV74

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Posted 03 January 2022 - 11:35 PM

I really like the final product. It shows a lot of elegance and restraint in the design. Too often people go “over the top” with their design and totally lose sight of the elegance of simplicity.

#16 durangodoug

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Posted 05 January 2022 - 12:10 AM

Love it!  Nice work, Cyrille!



#17 brentelgeuse

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Posted 05 January 2022 - 03:10 PM

Well, here is the finished product!

You made the focuser out of wood as well?!?



#18 ShaulaB

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Posted 05 January 2022 - 03:23 PM

Absolutely gorgeous ❤️ very fine work!

#19 Joe1950

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Posted 09 January 2022 - 11:07 PM

Truly a combination for science and the arts!



#20 brebisson

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Posted 18 January 2022 - 03:06 AM

Hello,

 

So, this WE I was able to finish the scope and give it to it's new owner!

Here are some pictures of the "making of" and the final product.

 

The first picture shows the 7 rings that constitute the scope structure. They are of diminishing size of course as the light cone tapers. Each ring is circular inside and a 40 sided polygon on the outside to allow the gluing of the slats.

They are cut as 4 independent quarter to save material AND because I cut them with my small cnc (30*18cm)...

 

In the same picture, you can see the cuts for the crayford style wood focusser (top left).

All the dark wood is wallnut from my father's garden.

 

IMG_20210926_174319_2.jpg

 

Now on to the altitude bearings. Cut with a larger CNC with a tree of life inlay which is then painted black.

IMG_20211124_130859_7.jpg

 

These bearings will be held with wood collars. So on to a new technique for me. Wood bending!

Take thin strips of wood, soak them in water, bend them on a form. let them dry and glue them.

Here are strips being bend (note the large number of clamps!)

IMG_20211102_181013_9.jpg


Edited by brebisson, 18 January 2022 - 03:06 AM.


#21 brebisson

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Posted 18 January 2022 - 03:15 AM

The mirror cell is made out of 9 pieces of wood glued together (with some internal nuts for the push screws).

The parts are once again cnc cut.

IMG_20211112_092141_7.jpg

 

This shows the mirror cell attached to the scope.

3 wood pieces on the scope (shaped to look nice and with a floral carving in them, barely visible), have a M8 bold glued in them. Then a push spring and then the mirror cell with the 3 bronze nut wings. 3 push screws, using the aforementioned nuts buried in the mirror cell provide rock solid colimation. The mirror is silicon glued to the thing.

 

This picture also shows the way the 2 collars that connect the altitude bearings to the scope are tentioned.

DSC_7479.JPG

 

 

This picture shows my vacum cleaner cannister. You can clearly see the sawdust from the various wood essences that I used :-)

IMG_20211112_090417_6.jpg



#22 brebisson

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Posted 18 January 2022 - 03:20 AM

Here the base is being constructed.

It will also have floral accents and the side are designed to be reminding of a celtic harp.

It is made of maple.

 

IMG_20211216_152812_1.jpg

 

The azimuth bearing is pretty standard. PTFE will be used for the bearing, gliding directly on the waxed bottom of the base.

The center nut is recessed in the base and will be hidden with a wood plug.

 

IMG_20211216_153413_8.jpg

 

A regular style spider is used, 3 M4 threaded rods hold the 50mm secondary into place. Of course I have some reinforcements at the attachment points to avoid issues.

Bronze thumbscrews are used for collimation.

The interior has a mat, black paint.

 

DSC_7472.JPG



#23 brebisson

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Posted 18 January 2022 - 03:29 AM

Some details about the UTA.

The PO is quite low profile (5cm), crayford with a 45mm drawtube and a mostly wood.

The push rod is a section of a 3mm knitting needle (don't tell my wife!).

More bronze screws are used to hold the EP and the push rod.

 

The viewdinfer is based on a red dot that had some issues (bad contact).

So I gutted the electrics and the lens and palced in a wood structure. Including a wood "dial" for the on/off and power level.

Note that the battery is hidden by a small wood pullout case at the back.

I tried using a metal sphere + cup magnet for the veiwfinder swivel. We will see how well it work for the user.

 

DSC_7471.JPG

 

And finally some all around pictures.

DSC_7474.JPG

 

Thanks for listening.


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#24 brentelgeuse

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Posted 18 January 2022 - 05:26 AM

Magnificent. Excellent work.



#25 sw196060

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Posted 18 January 2022 - 01:56 PM

Wow!!!!!!


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