Whitworth's Quick Return Motion Experiment

Whitworth's Quick Return Motion Experiment - Universiti...

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Universiti Tenaga Nasional, 2006 Mechanical Design and CAD Laboratory WHITWORTH’S QUICK RETURN MOTION EXPERIMENT OBJECTIVES The objective of this experiment is to investigate the performance of a Whitworth’s Quick Return Motion and to verify that the motion does have a quick return stroke and a slow cutting or forward stroke. THEORY Definition of a Mechanism A mechanism is a simplified model, usually in the form of a line diagram, which is used to reproduce exactly the motion occurring in a machine. The purpose of this reproduction is to enable the nature of the motion to be investigated without the encumbrance of the various solid bodies which form the machine elements. The various parts of mechanism are called links or elements. Where two links are in contact and relative motion is possible, then they are known as a pair. An arbitrary set of links which form a closed chain that is capable of relative motion, and that can be made into a rigid structure by the addition of a single link, is known as a kinematics chain. To form a mechanism from a kinematics chain one of the links must be fixed. However as any of the links can be fixed, it follows that there are as many mechanisms as there are links in the chain. The technique of obtaining different mechanisms by fixing the various links in turn is known as inversion.
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