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Animatronic eyeballs from Micropuller's post.

by welwell, published

Animatronic eyeballs from Micropuller's post. by welwell Nov 6, 2013
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Summary

Built exactly from Micropuller's excellent post; with the exception that the base would not fit my printer. So I sliced the base into two parts, printed them, then glued them together with acetone. I have attached the base files that are split into two separate STLs. http://youtu.be/cFA0JGZUOWg

Instructions

Print each base part, glue together with acetone glue, and leave it alone for 24 hours. I mixed some white filamant with acetone and let it sit for a few hours. Makes excellent glue to join ABS.

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I've got a few more questions if you don't mind.

As I'm starting to assemble everything, I'm noticing that the eyelids and the eyeballs have virtually no 'play' between them. They're rubbing up against each other. I haven't even placed screws into the holes through the base and into the eyelids yet, but I guarantee there's no room for a nut on the inside. Did you have similar problems? Maybe it's shrinkage I didn't account for, I dunno.

There is no nut on the inside. The screw is held tight by threads in the base and the eyelids rotate loosely on the screw. The eyelids themselves are just large enough to rotate across the eye without rubbing. If they are too small, I suggest printing the eyelids again at slightly larger scale like 1.05 or so; or sand the inside of the eyelids til they fit. Or print the eyeballs slightly smaller (a better solution).

I sanded the inside of the eyelids down and that seems to work better. Put a screw in the sides and it's tight, but they do rotate freely. I'm having another problem where the servo's are just too big to fit in without either major sanding or a redesign. My servos specifically have the wires coming out from the sides versus the bottom, so there's just not enough room to slip them down into the slots, but that's not something anyone not using these particular brand of servos could have predicted. I may end up modding and reprinting the baseplate.

Thanks for the help though. Your pics detailing the connections have been most enlightening.

What size ball joints are the eyes set up for?

Tanks for your input on the eye mechanism I was stuck for the eye ball setup, your pics.has help me to sort it out,
Thanks again

WelWell,
Very nice sample from the original design.
Could you share some picture of the backsides of the "eyes" ?
And eventually also some detail shots of the links on the eyeballs ?
Thanks !

Done. Look above in the thing info.....

I'm in the beginning stages of building form micropuller's design - how did you attach the u-joints to the inside of the eyeballs? I see the holes, but I'm about to glue them. Also, if you use 3 mm screws and nuts as a default, does that work in most cases?

Thanks,

secondjohn

You are correct in both cases: I used 3mm bolts and nuts. I glued the ujoints in with "glue" that I made with acetone and ABS filament plastic. Since both the eyeball and the ujoints are printed from the same material, this glue works well........but let it dry overnight or the parts will be too soft.

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