Mechanisms and Machines 5 pdf format
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introduction of Mechanisms and MachinesMechanism: the fundamental physical or chemical processes involved in or responsible for an action, reaction or other natural phenomenon. Machine: an assemblage of parts that transmit forces, motion and energy in a predetermined manner.This bundle contains:1-InPrice $15.57Original Price $24.72Save $9.15
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1.Introduction
-If power transmitted between two shafts is small, motion between them may be obtained by using two plain cylinders or discs 1 and 2 as shown in fig.
-If there is no slip of one surface relative to the other, a definite motion of 1 can be transmitted to 2 and vice-versa. Such wheels are termed as “friction wheels”. However, as the power transmitted increases, slip occurs between the discs and the motion no longer remains definite.
-Assuming no slipping of the two surfaces, the following kinematic relationship exists for their linear velocity:
-To transmit a definite motion of one disc to the other or to prevent slip between the surfaces, projection and recesses on the two discs can be made which can mesh with each other. This leads to formation of teeth on the discs and the motion between the surfaces changes from rolling to sliding. The discs with the teeth are known as gears or gear wheels.
-It is to be noted that if the disc I rotates in the clockwise direction, 2 rotates in the counter clockwise direction and vice-versa.
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