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 Compressive stress in fulcrum pin of lever given reaction force, depth of lever arm?
Compressive stress in fulcrum pin of lever given reaction force, depth of lever arm calculator uses Compressive Stress in Fulcrum Pin = Force at Lever Fulcrum Pin/(Diameter of Lever Fulcrum Pin*Length of Pin Boss) to calculate the Compressive Stress in Fulcrum Pin, Compressive stress in fulcrum pin of lever given reaction force, depth of lever arm formula is defined as a measure of the compressive force per unit area on the fulcrum pin of a lever, considering the reaction force and lever arm depth. Compressive Stress in Fulcrum Pin is denoted by σtfp symbol.
How to calculate Compressive stress in fulcrum pin of lever given reaction force, depth of lever arm using this online calculator? To use this online calculator for Compressive stress in fulcrum pin of lever given reaction force, depth of lever arm, enter Force at Lever Fulcrum Pin (Rf), Diameter of Lever Fulcrum Pin (d1) & Length of Pin Boss (l) and hit the calculate button. Here is how the Compressive stress in fulcrum pin of lever given reaction force, depth of lever arm calculation can be explained with given input values -> 2.8E-5 = 2964/(0.0123913*0.009242006).