Before revision: Structural elements Beams, Struts Bearings Fasteners Keys, Splines and Cotter pin Seals Machine guardings Mechanical elements Engine, Electric motor, Actuator Shafts Couplings Belt, Chain, Cable drives Gear train Clutch Brake Flywheel Cam and follower systemsLinkage Simple machine Types Shafts Coupling Key Spline Bearing Roller bearing Plain bearing Thrust bearing Ball bearing Linear bearing Pillow block Gears Spur gear Helical gear Worm gear Herringbone gear FastenerNiemann, Gustav; Hirt, Manfred: Maschinenelemente Springer, Berlin 1975, 1983. .
After revision: Structural elements Beams, Struts , Bearings, Fasteners Keys, Splines , Cotter pin, Seals Machine guardings Mechanical elements Engine, Electric motor, Actuator , Shafts, Couplings Belt, Chain, Cable drives , Gear train, Clutch, Brake, Flywheel, Cam, follower systems, Linkage, Simple machine Types Shafts Coupling Key Spline Bearing Roller bearing Plain bearing Thrust bearing Ball bearing Linear bearing Pillow block Gears Spur gear Helical gear Worm gear Herringbone gear FastenerNiemann, Gustav; Hirt, Manfred: Maschinenelemente Springer, Berlin 1975, 1983. .