Cam's Animatronic C-3PO

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Cameron Ross

New Member
I began last year (2019) on my Animatronic C-3PO build. I have had the fiberglass costume components from TK-409 to build a replica statue for several years now. But I decided I wanted more than basic lights and sounds.

Last year I built the base from 2x4 aluminium rectangular tubing and 3mm ABS sheet. The support rods in the legs are 3/4" pipe with flanges. And animation will be from the waist up.

My goal is to go as light as possible, to lessen the loads on the servos. I also plan to use 100% servos to control all movement.

I would also like to acknowledge Chris Lee's build for its inspiration and motivation for me!!
As I am trying to go lighter with less robust motors, I am sure that Chris's 3PO would crush mine in a fight! :)

2019-03-25 21.20.04.jpg

2019-03-25 21.22.05.jpg

2019-03-25 21.24.10.jpg
 

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Cameron Ross

New Member
The servos I installed in the neck are HiTec HS-645MG
I was not sure if they would be powerful enough, but they seem to be more than capable of moving the head (even when I attached extra weight).
Using the 6 servo tester seen in the above pictures, the movement was too fast and jerky, but I intend to smooth that out using my final controller software.

I intend to control all the servos, the lights in the eyes, and the voice-audio using the DMX protocols.
 

Cameron Ross

New Member
Here, I have attached one arm (I built one as a prototype this past summer)
The arms will have 5 points of articulation:
  • wrist bend
  • wrist rotate
  • elbow bend
  • shoulder pivot
  • shoulder rotate
I will trim the servos to all be 90° or less for each of these. End points and middle will be defined in both the servo controller and the control software - so no limit switches.

Initially, I will 3D-print some display hands to attach - but I'd like to eventually build up the costume hands/fingers I have into an animated hand. This would likely be using 1 or 2 micro servos - moving all fingers as one in and open-close hand motion.)

The shoulder point attachments are not final! I am using a 6-32 plastic tie-rod end as a top pivot point and that will be a 1/4 inch steel one. The linear actuators are the same size as the ones I will use. However the ones I will use are servo-based and a fair bit stronger. There will also be a servo in the bicep channel attached to the shoulder disc by a tie rod to provide the shoulder rotation.

2020-03-22 19.35.32.jpg
 

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