Thread: My 3 axis skull...in progress

Tweet

To answer your questions,

First, a short video:

YouTube - Robotic Arm Design

There are 3 servos. You can see how they are laid out. The large spring was needed to assist the shoulder servo in lifting the arm. The elbow servo and the "Twist" servo (At the top) do not need to be as large.

I was using metal gear 995MG servos from China. This was for testing. I had 2 fail because they are cheap knockoff servos and for final versions will probably go with equivilent HiTec servos, and perhaps a larger servo for the shoulder. The larger shoulder servo might even eliminate the need for the assist spring.

But what you see is exactly what I used in this years quartet and videos.

I will also be making final versions out of more durable material, but the Cast acryllic was easiest to work with.


Bob

Very nice of you to post this Bob! Thanks!

You're Welcome....

And now a song that my wife wrote most of the lyrics for and sang the lead on:

YouTube - I'm In The Mood For Fright

I'm in the mood for Fright!

Well now that I know I can build a reliable and fully functional skull, I figure I will tackle something like this for next year.

I think I will try my use of gears and torsion springs for the shoulders. I was truly amazed that after using reduction on the nod servo and putting in a torsion spring. Jeepers Creepers ran the entire night on one C cell 1500 MAH 7.2 pack. That was with about 70 routines run.

As far as your work and this theatrical effort. Gonna take one heck of an effort to come even close to matching it, but I am gonna try.

HB, very nice job on everything!! Have you thought of using "air muscles" for the arm movement? Just wondering if that was an option. Again very nice job!!

Wow Bob, once again a fantastic routine that's better than the one before it! Kudos!
You've really come a long way from your fishing rod days!

MsM

I wanted to say THANKS to everyone at HalloweenForum for all of the great information and assistance this past year. I know there is no way I could've tackled a project like this without all of your help. A special thanks to the guys at graveyardskulls for making it even easier. Here is my video for 2009:

YouTube- Halloween 2009 - Singing Skulls

Mike

Originally Posted by agentbud

I wanted to say THANKS to everyone at HalloweenForum for all of the great information and assistance this past year. I know there is no way I could've tackled a project like this without all of your help. A special thanks to the guys at graveyardskulls for making it even easier. Here is my video for 2009:

<object width="445" height="364"><param name="movie" value="http://www.youtube.com/v/ukUtFDu7QOk&hl=en&fs=1&border=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/ukUtFDu7QOk&hl=en&fs=1&border=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="445" height="364"></embed></object>

Mike

Huh? LOL!!

Ok, what's the trick to embedding a youtube video?

Nevermind - figured it out. See video in previous post above.

Thanks...
Mike

Very nice , nice action. You did a good job!!