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

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.

thingiverse.com/thing:230816

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

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: flickr.com/photos/8829589@N0 … 824474558/

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?

- Grant

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

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!

- Grant

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.

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

- Grant

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:

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

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

The assembled four quadrants in the middle of the bondo/primer/sanding process:

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

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

- Grant

[quote=“grant”]Cool update! What are your plans for the legs? Are they going to move?

  • Grant[/quote]
    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:

First hextant (1 of 6) part for the lower dome.

Build updates:

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

Primer coats before wet sanding of 2 legs, upper and lower body domes

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

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?

- Grant

No, I don’t have the time/budget to make that trip. The closest I will be with Sapporo will be at Anime Expo in LA over the July 4th weekend.

Paul

Latest build pics: Finish work on the lower dome leg joint covers, and dry-fitting the current body parts together.


Thanks for the update. How do the pieces bind together? Do they snap into one another?

Are you going to have a booth at Anime Expo?

- Grant

Kinda lazy of me, but here’s a link to the latest full post I did on the RPF for the Tachikoma build:
therpf.com/f11/1-4-scale-r-c … ost3333557

It includes a bunch of pics of the latest printed parts, the pile of new electronics that will be the guts of Sapporo, and
an explanation of some of the assembly process.

No booth at AX, I’m just one of the staff who work the con who has other semi-related hobbies I can show off at con. :slight_smile:


Color paint pass on the sensor “eyeballs” for the upper dome. I also have the swash plates and mounting supports that the sensor balls attach to allow for them to move completed, and will be mounting all of that over the weekend, along with the related servos and control cables.

Also, my “How to Build a Tachikoma 2.0” panel also got approved for Anime Expo. It is on Thursday, July 3rd, at 8:15pm in Room 501 (as of the current posted Programming Schedule at the time of this post…)