The centrifugal clutch is a special application of a block clutch. Machines containing heavy parts to be moved, such as a rolling mill, use oil clutches. The grip of the coil causes great friction when it is thrust onto a cone on the driving shaft. Yet the clutch is very sensitive to control. Diesel engines and transportation equipment use pneumatic and hydraulic clutches.
Springs are another element used in machinery.
Springs can be twisted, pulled, or stretched by force and can return to their original shape when the force is released. One basic mechanism of machines is the gear differential. A gear differential is a mechanism that is capable of adding and subtracting mechanically. Other basic mechanisms include linkages, couplings, cams and cam followers, and clutches. Integrated Publishing's Official Web Page Click here for a current index of everything on this web site.