Slip : When the frictional grip becomes insufficient. This may cause some forward motion of the driver without carrying the belt with it. This may also cause some forward motion of the belt without carrying the driven pulley with it. This is called slip of the belt and is generally expressed as a percentage. Creep : When the belt passes from the slack side to the tight side, a certain portion of the belt extends and it contracts again when the belt passes from the tight side to slack side.
The follower during its travel may have one of the following motions.
1. Uniform velocity,
2. Simple harmonic motion,
3. Uniform acceleration and retardation,
4. Cycloidal motion.
1. Mechanism : When one of the links of a kinematic chain is fixed, the chain is known as mechanism.
2. Inversion of mechanism The method of obtaining different mechanisms by fixing different links in a kinematic chain, is known as inversion of the mechanism. So we can obtain as many mechanisms as the number of links in a kinematic chain by fixing, in turn, different links in a kinematic chain.