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How to Build a Robot Tutorial - Society of Robots Introduction to Mechanical Engineering Theory, Statics Want to optimize your robot parameters mathematically? Want to verify that an expensive motor you are about to purchase has enough torque? This is a math tutorial for robot chassis construction. My approach will be talking about the most common calculation uses of mechanical forces for robots. Theory: Statics Statics is concerned about how a mechanical system would act if everything is perfectly motionless and rigid. Remember in elementary you learned (or should have learned) that for every force there is an equal and opposite force? Now suppose you add in friction of joints, efficiency rates, multiple actuators, and unevenly distributed weight across an oddly shaped object. Moment Arms Moment arms will probably be the most useful for you. Moment = Force * distance Here is the first example. All you do is measure the distance and multiply that by the force that is being applied. Now suppose your robot is lifting a beer with an arm.