GitS Tachikoma R/C build (was Universal hubs to VEX adapter)

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GitS Tachikoma R/C build (was Universal hubs to VEX adapter)

Postby Hardsuit » Mon Jan 20, 2014 7:46 pm

I've uploaded an adapter that lets you use the Pololu Universal Aluminum Mounting Hubs with VEX 4" mecanum wheels without having to permanently modify the wheels in any way.

http://www.thingiverse.com/thing:230816
Last edited by Hardsuit on Thu Apr 24, 2014 10:55 pm, edited 2 times in total.
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Re: Adapter for universal hubs to VEX wheels

Postby grant » Tue Jan 21, 2014 6:08 pm

Hello.

That's really neat! If you are willing to share, I'd like to hear about what you made using the hubs and wheels.

- Grant
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Re: Adapter for universal hubs to VEX wheels

Postby Hardsuit » Tue Jan 21, 2014 8:58 pm

I'm working on a ~1/4 scale R/C Tachikoma from the Ghost in the Shell: Stand Alone Complex anime tv series.

The adapter is for the new, larger version that I'm working on now, using the info I gained from my first version from a year or so ago.
This newer version is going to be about 30" tall, compared to the older one which was 18" tall.

I have some of the build pics from the first version here: http://www.flickr.com/photos/8829589@N0 ... 824474558/
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Re: Adapter for universal hubs to VEX wheels

Postby grant » Wed Jan 22, 2014 6:25 pm

That's really awesome! I would very much like to see the Tachikoma when it is complete (some of the engineers here are GITS fans). In the meantime, I would like to post on our blog about the adapter. Is it okay if we use some of your pictures from Flickr and Thingiverse?

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Re: Adapter for universal hubs to VEX wheels

Postby Hardsuit » Fri Jan 24, 2014 6:36 pm

Sure, go ahead and use the photos for your blog post. Are there any more pics you would want/need?

I'm aiming to have Sapporo (the Tachikoma) ready to be shown at Anime Expo this year in July, so I will have
photos of the finished project along with in-progess build photos. In addition to the Universal Hubs, I'm using
four Pololu Simple High-Power Motor Controllers (18v15) and the 37Dx52L mm 29:1 Metal Gearmotors.

The smaller scale version in the Flickr video was using the 37D motors, but only 2 of the motor controllers in
a tank drive setup using the 2" Fingertech mecanum wheels.

Paul
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Re: Adapter for universal hubs to VEX wheels

Postby grant » Tue Jan 28, 2014 5:05 pm

Thanks, I don't need any additional photos, but feel free to share them. I have made a post about your project on our blog. Please keep us updated on the progress of Sapporo!

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Re: Adapter for universal hubs to VEX wheels

Postby Hardsuit » Tue Mar 18, 2014 11:15 pm

Small update on the project progress. I have the upper dome for Sapporo's body now printed, primed, and sanded.
Looking good, if I do say so myself... The dome is assembled from four 3d printed pieces, and after assembly
measures 13" in diameter, and 5" tall.

Image
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Re: Adapter for universal hubs to VEX wheels

Postby grant » Wed Mar 19, 2014 2:49 pm

Awesome progress! Out of curiosity, what are the four pieces? What printer did you use to print them?

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Re: Adapter for universal hubs to VEX wheels

Postby Hardsuit » Wed Mar 19, 2014 4:28 pm

For the prints, I'm using one of the Polyprinter Plus units that we have at the Dallas Makerspace.

1st quadrant (front) cooling down just after printing is finshed:
Image

Three quadrants (front and sides) dry-fitted together:
Image

Shot of the under side of the assembled dome, showing the rabbet joint that was designed into the parts:
Image

The assembled four quadrants in the middle of the bondo/primer/sanding process:
Image
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Re: Adapter for universal hubs to VEX wheels

Postby Hardsuit » Thu Apr 10, 2014 9:03 pm

Minor update on the Tachikoma:
New parts arrival fresh from the 3d printer (Shoutout to the PolyPrinter folks for using the legs as one of their prototyping shapes as they do beta testing on their new double-wide printers), and paint color test on the upper dome body

Image
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Re: Adapter for universal hubs to VEX wheels

Postby grant » Fri Apr 11, 2014 3:04 pm

Cool update! What are your plans for the legs? Are they going to move?

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Re: Adapter for universal hubs to VEX wheels

Postby Hardsuit » Sat Apr 12, 2014 8:44 pm

grant wrote:Cool update! What are your plans for the legs? Are they going to move?

- Grant

For now, one servo hinge point at the top of the legs. With individual control of each servo I should be able to have him
lean side to side, bow, rear back, and twist slightly.

New part printed as well:

Image

First hextant (1 of 6) part for the lower dome.
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Re: Universal hubs to VEX adapter (GitS Tachikoma R/C build)

Postby Hardsuit » Thu Apr 24, 2014 8:14 pm

Build updates:

Surface prep of legs in various levels of completion, plus dry fit of 5/6 of the lower dome parts
Image

Primer coats before wet sanding of 2 legs, upper and lower body domes
Image
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Re: Universal hubs to VEX adapter (GitS Tachikoma R/C build)

Postby Hardsuit » Thu Apr 24, 2014 8:15 pm

Not really a part of the Tachikoma build, but a useful demo piece for when I do a panel or have a table at a con or Maker Faire.
I used a failed print from the upper dome to have a visual explanation of my finishing process for the 3d prints.

Starting on the left:
Raw print - Sanded raw print - Bondo - Sanded Bondo - Primer - Rough sanded primer - 600 grit wet sanded primer - Final finish color
Image
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Re: GitS Tachikoma R/C build (was Universal hubs to VEX adap

Postby grant » Fri Apr 25, 2014 12:07 pm

That's really neat! It is cool to see all the steps you took to get that nice finish.

By the way, are you planning to attend the Bay Area Maker Faire?

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