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 Length of fulcrum pin boss given compressive stress in pin?
Length of fulcrum pin boss given compressive stress in pin calculator uses Length of Pin Boss = Force at Lever Fulcrum Pin/(Compressive Stress in Fulcrum Pin*Diameter of Lever Fulcrum Pin) to calculate the Length of Pin Boss, The Length of fulcrum pin boss given compressive stress in pin is the length of the bushing or the boss of the pin used as a bushing between the pin and the pinhole. Length of Pin Boss is denoted by l symbol.
How to calculate Length of fulcrum pin boss given compressive stress in pin using this online calculator? To use this online calculator for Length of fulcrum pin boss given compressive stress in pin, enter Force at Lever Fulcrum Pin (Rf), Compressive Stress in Fulcrum Pin (σtfp) & Diameter of Lever Fulcrum Pin (d1) and hit the calculate button. Here is how the Length of fulcrum pin boss given compressive stress in pin calculation can be explained with given input values -> 11849.29 = 3560/(25900000*0.0116).