Before revision: Structural elements Beams, Struts Bearings Fasteners Keys, Splines and Cotter pin Seals Mechanical elements Engine, Electric motor, Actuator Shafts Couplings Belt, Chain, Cable drives Gear train Clutch Brake Flywheel Cam and 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 Sprocket FastenerNiemann, Gustav; Hirt, Manfred: Maschinenelemente Springer, Berlin 1975, 1983. .
After revision: Machine guardingsStructural elements Beams, Struts Bearings Fasteners Keys, Splines and Cotter pin Seals Mechanical elements Engine, Electric motor, Actuator Shafts Couplings Belt, Chain, Cable drives Gear train Clutch Brake Flywheel Cam and 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 Sprocket FastenerNiemann, Gustav; Hirt, Manfred: Maschinenelemente Springer, Berlin 1975, 1983. .