Author Topic: Colibri Hummingbird Dynamic Sculpture - WIP  (Read 42898 times)

Online Vixen

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Re: Colibri Hummingbird Dynamic Sculpture - WIP
« Reply #180 on: March 16, 2018, 10:38:30 PM »
I still think that Colibri's wing/shoulder joint and mechanism is most graceful and artist piece of mechanical design..... ever.

Mike
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Offline crueby

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Re: Colibri Hummingbird Dynamic Sculpture - WIP
« Reply #181 on: March 16, 2018, 11:00:37 PM »
Very very nice!   :ThumbsUp:

Offline b.lindsey

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Re: Colibri Hummingbird Dynamic Sculpture - WIP
« Reply #182 on: March 16, 2018, 11:55:24 PM »
Wonderful Kirk. Seems to be relatively smooth throughout the entire cycle and the metal and acrylic nake for a very nice contrast. Well done!!

Bill

Offline Steamer5

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Re: Colibri Hummingbird Dynamic Sculpture - WIP
« Reply #183 on: March 16, 2018, 11:59:04 PM »
 Very nice!
Mesmerizing to watch.

Cheers Kerrin
Get excited and make something!

Offline Art K

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Re: Colibri Hummingbird Dynamic Sculpture - WIP
« Reply #184 on: March 17, 2018, 03:45:54 AM »
Looks great Kirk.
 :cartwheel:
Art
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Offline Kim

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Re: Colibri Hummingbird Dynamic Sculpture - WIP
« Reply #185 on: March 17, 2018, 04:59:12 AM »
Very nice Kirk!  That's truly a great piece of art!

Kim

PS  I can even hear a bird chirping slowly in the background! :)

Offline ShopShoe

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Re: Colibri Hummingbird Dynamic Sculpture - WIP
« Reply #186 on: March 17, 2018, 01:08:39 PM »
I've been waiting for the video of the sculpture in motion. It's better than I imagined.

Congratulations on the the completion of this intricate and beautiful piece of art.

--ShopShoe

Offline zeeprogrammer

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Re: Colibri Hummingbird Dynamic Sculpture - WIP
« Reply #187 on: May 01, 2018, 10:56:41 PM »
I remembered tonight I was following this and waiting for the video.

Very nice! Truth be...a lot more people will enjoy this over a steam engine.

 :ThumbsUp: Nicely done.
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Offline KB

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Re: Colibri Hummingbird Dynamic Sculpture - WIP
« Reply #188 on: May 02, 2018, 04:13:34 AM »
So nice, very well done.

I love the fluid mechanicalness of it all.

Offline kvom

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Re: Colibri Hummingbird Dynamic Sculpture - WIP
« Reply #189 on: August 28, 2022, 03:07:28 PM »
I'm going to revive this project as the sculpture has been lying in pieces for a couple of years pending some repairs that I haven't felt incented to get to (pandemic lethargy is my excuse).

When I took it to NAMES before the shutdown, I had to partially disassemble the wings for safe travel.  Upon reassembly at the show, I stupidly hooked the motor leads in reverse causing the gears to turn backward, and this caused a jam resulting in two of the gear shafts bending.  These shafts are only 1/8" in diameter and have flats milled into them for alignment with grub screws.  My intention is to use larger diameter rod.

Another problem, that is evident in the video, is that the main assembly is quite top-heavy.  So when raising a lowering it, the force on the bottom cam is quite high.  The cam rides on a roller bearing that is supported only by a screw through the bottom frame.  This was insufficient to keep the bearing shaft from flexing so that on its downward path to the flower, the beak jerks.  This weight also caused the bottom gear shaft to flex and wallow out the brass bearing (needs to be bronze).  So I'll need to design a support for the roller bearing that's much stronger.

An incentive to do all of this is that I've recently obtained a 3D printer made by a company called Markforged.  This printer is a bit different from the normal plastic printer in that in uses only a filament called Onyx, which is nylon mixed with chopped carbon fiber.  The resulting parts are claimed to be equal in strength to aluminum while being much lighter.  I have printed a number of parts that replace larger and heavier brass and aluminum in the body of the bird, which is the topmost part of the sculpture.  All such parts are black, but I doubt that will matter to the overall look of the sculpture.  So the moving assembly will be a good deal lighter.

Here are the parts with the printed replacements:



The original parts being weighed.  Over a kg:



And the printed versions: 129g:



« Last Edit: August 28, 2022, 03:32:45 PM by kvom »

Offline Kim

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Re: Colibri Hummingbird Dynamic Sculpture - WIP
« Reply #190 on: August 28, 2022, 06:38:27 PM »
Those parts look great!  And are significantly lighter than the brass/aluminum parts they're replacing!

It will be exciting to see this going again.  And to see how the nylon/carbon fiber prints work out.  :popcorn:

Kim


Offline Admiral_dk

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Re: Colibri Hummingbird Dynamic Sculpture - WIP
« Reply #191 on: August 28, 2022, 09:50:53 PM »
Interesting 'Twist to the Story' - and likewise curious to see a Video of the revised version running  - Hint, hint ....        :cheers:

Per

Offline kvom

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Re: Colibri Hummingbird Dynamic Sculpture - WIP
« Reply #192 on: August 29, 2022, 12:38:40 PM »
I'm reviving my tournament bridge career as well this week, so minimal progress during the tournament that starts tomorrow.  The model is stripped down pretty completely.  I ordered a length of bronze rod for the gear axle bearings and have machined the new bearing support for the lower cam.  Pics when I can get to it.

One reason the Onyx parts are so light is that the interiors are filled with a triangular lattice vs. solid material.

Offline kvom

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Re: Colibri Hummingbird Dynamic Sculpture - WIP
« Reply #193 on: August 30, 2022, 01:11:47 AM »
I did a quick turning job to rectify the lower cam roller bending; from 1 piece of 1" diameter drill rod, turned to 1/4" on each end with a 3/8" intermediate section.  Secured to the frame with an 8-32 screw, the same being used to secure the needle bearing.



Next shop session will be to enlarge the axle holes in the body frame to 3/8" and the matching holes in the large gears and cams to 3/16".

Offline crueby

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Re: Colibri Hummingbird Dynamic Sculpture - WIP
« Reply #194 on: August 30, 2022, 02:19:42 AM »
kvom, is that onyx material paintable?

 

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