Dear Paolo, studying the infamous three levers for transmitting force... I noticed that the calculations for the mechanical advantage of the hammer lever don't add up to me; in the sense that, since the hammer is pivoted on one side by its fork (rotation fulcrum) and receives a push under its roller (effort force), and therefore the resistance force given by the weight of the lever itself plus the hammer head located at the opposite end... meaning the resistance arm is longer than the effort arm... how does that work.. could you kindly help me?
Levers are distinguished and called first, second, and third class depending on the position of the fulcrum relative to the two forces. The key (first-class lever) has a central fulcrum. The wippen and the hammer lever have a lateral fulcrum and the effort force at the midpoint. The other "small lever" called the escapement lever is also first-class; the fulcrum is in the center (its pivot), the effort force (the push from the escapement button that the lever encounters during the wippen's ascent), and the resistance force (the weight of the hammer shank).
