I now plan on using a wheeled chasis to drive the fembot, much easier than legs. The lower half of the bot will be static, and i only plan on the head and arms to move. I was wondering how reliable it would be to use an 805 bb hightech servo with a mega gearbox attatched to move a shoulder joint. The arm will be the same length as a human, and probably only max weight at 5 pounds? for the entire arm. Each arm will have 3 servos. One at shoulder, one at elbow, and one in forearm for twist motion. hands are static. I am molding parts from a mannequin and casting in urethane/liquid plastic, i am going to slosh the castings so that they will be hollow. The skeletal main frame is going to be made of square wood rods connecting the servos with aluminumL-brackets (some custom). i was recomended that i not use the 805 as a direct shoulder joint, but it might work with a proper gearbox attatched.
Thanks
Sam S.
The RobotShop Robot Arm Torque Calculator was made specifically for this type of question. In your case, A1 would represent the hand (and anything it carries), M1 would be the mass of the forearm, A2 would be the mass of the elbow actuator and A3 would be the mass of the two shoulder actuators combined (though it does not affect the calculations unless they are a distance apart). Lower the efficiency to 70, and raise the safety factor to 3.