Excel Belleville Spring Calculator

Belleville Springs (aka “Belleville Washers”, “Spring Washers”, or “Disk Springs”) are wonderfully useful mechanical devices, but with one minor drawback – their properties are difficult to calculate – until now!  Almen and Laszlo were the first to develop a workable calculation method, but it can only loosely be described as “workable.”  (This is the method…

Friction Factor Calculation in Excel

Happy 4th of July Everybody! When in the course of human events it becomes necessary to calculate the Darcy-Weisbach friction factor… engineer’s often throw up their hands, go back to their old college textbooks, and say “about .02!” [Which normally isn’t off by more than a factor of 2 in either direction.] If you want…