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Tips from another Sam
Directly quoted from personal messages:
I guess if you try to break it down, designing and making something like this would involve a few steps / considerations:
1. Designing and building the frame to house the below. 2. Identifying the pivots points and range of movement: Here I'm assuming three points, shoulder, elbow and wrist.
At it simplest, each pivot point is just a lever (look up in wikipedia).
Gravity will causes it to move and rest in one way. You need to figure out how and then design a system that counteracts gravity to provide articulation (i.e. just like the muscles in our arms).
The trick is to identify which direction the counter force need to be in to generate the desired movement. Once you identified the direction, you then need to choose the source of this opposing force. i.e. strings, wires, hydraulics etc.
Let assume for the time being that the wire from a brake handle is a feasible option. If the force from the wire needs to come from a certain direction, you need to incorporate this into the design of your frame so that it can accommodate this.
Through trial and error, you'll probably need to experiment and consider how heavy this thing is going to be. Too light and the frame will probably not be strong enough. Too heavy and the force require to overcome gravity is too much.
This needs to be embroidered on something. :)