What is a first class lever?
First-class levers have the fulcrum between the force and the load. In using a screwdriver to lift the lid from a paint tin you are moving the effort over a greater distance than the load. By having the fulcrum (the rim of the tin) close to the lid (the load) a larger force can be applied to the load to open the tin.
This means you are reducing the effort required, this is what first-class levers do best. Other examples of first-class levers are pliers, scissors, a crowbar, a claw hammer, a see-saw, and a weighing balance.
In summary, in a first-class lever, the effort (force) moves over a large distance to move the load a smaller distance, and the fulcrum is between the effort (force) and the load. As the ratio of effort (force) arm length to load arm length increases the mechanical advantage of a first-class lever increases.
Archimedes referred to a first-class lever in his famous quote “Give me one firm spot on which to rest (a fulcrum) and I will move the Earth”
How to Calculate Outside diameter of boss in lever?
Outside diameter of boss in lever calculator uses Outside Diameter of Lever Boss = 2*Diameter of Lever Fulcrum Pin to calculate the Outside Diameter of Lever Boss, The Outside diameter of boss in lever is the outside diameter of the external surface of the boss of the fulcrum pin. Outside Diameter of Lever Boss is denoted by Do symbol.
How to calculate Outside diameter of boss in lever using this online calculator? To use this online calculator for Outside diameter of boss in lever, enter Diameter of Lever Fulcrum Pin (d1) and hit the calculate button. Here is how the Outside diameter of boss in lever calculation can be explained with given input values -> 23200 = 2*0.0116.