If You Have Three Gears Rotating Together Which Gear Will Wear the Most Mechanical Engineering Philip Kosky , ... George Wise , in Exploring Engineering (Fifth Edition) , 2021 fourteen.4.2 Motorcar Elements Machine elements are bones mechanical parts used as the edifice blocks of most machines. They include shafts, gears, bearings, fasteners, springs, seals, couplings, then along. In this section we focus on the most commonly used machine element, gears. Gears are used