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Automated Arms

995 Views 2 Replies 2 Participants Last post by  Coach
I hope everyone had a great Halloween! This was an off year for me as I had a major home remodel project that took me out of the shop for most of the year. :mad:

However I am now ready to get started on next year. I've been playing with Vixen and have a Lynxmotion SSC32 servo controller on the way as well as a couple of 24 channel dimmable light controllers. This should be a lot easier then programming everything in VB and manually driving my old parallel port based relay card.

Now to the crux of the biscuit. With 32 servo channels available I plan on upgrading a couple of my heads to 3-axis movement but would like to take those props to the next level and add servo powered arm movements to them as well.

I have been searching the web and have found a few "singing quartets" that seem to be what I want, but no How-To articles for building them, in particular the advanced arm movements.

Anyone have suggestions?

Thanks, Harry
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I can think of two possibilities for arms.

Moving arms presents a problem of torque at the joints (shoulder, elbow)
that quickly increases with speed. This can be reduced somewhat by using
lighter materials other than your standard bucky type skellie has for arms. Maybe substituting blucky arms for example.

Use a wiper motor or monster servo to push/pull a cable or cables or heavy duty servos (metal gear) or 1/4 scale servos at the joints.

You could also use a wiper motor or monster servo with a pulley to raise/lower the arms and then supplement elbow and wrist movement with smaller servos.
Thanks for the input. I have a wiper motor sitting in the shop that I need to see how I can hack. As you suggest that should be plenty of torque to lift the arm at the shoulder.

Lots to learn, lots to play with.
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