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Step 1: Constructing a model

Before I began I examined the construction of my own arm and attempted to make a working model in cardboard. This went through several variations before I developed one that I was happy enough with to reproduce in plylwood.

Here is one of the earlier iterations...
<p>Thanks for making this project; this looks like an incredibly valuable tool for learning.</p><p>I just wanted to know what the dimensions you used from the model; which you transferred to the plywood. It looks like you had just transferred the dims from the model to the experimental version. Thank you.</p>
<p>What do you use the screw eyes for ?</p>
I threaded the string through them, they guide the string so that when you pull on the string you can pull with a force probe or scale to see how much force you are using for different motions of the arm.
A class set? <br> <br>Dedication in action! <br> <br>(Have you seen &quot;air muscles&quot;? Compressed air makes them expand perpendicular to their length, but contract along their length.) <br> <br>
Tell me more about these air muscles, that sounds like another project for me!
http://www.shadowrobot.com/airmuscles/ <br> <br>...and... <br> <br>http://www.instructables.com/id/How-to-make-air-muscles!/ <br> <br>
Those are great, I'll add them to my list of projects!
Very cool, thanks for doing this. My kids will love this project!

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Bio: I'm a physics and chemistry teacher at a public school in Maryland and active in my local science teacher's association. I love building ... More »
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