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Wednesday, July 3, 2013




2.Principles of Motion Economy Developed over many years of practical experience in work design They are guidelines that can be used to help determine Work method Workplace layout Tools, and equipment Objective is to maximize efficiency and minimize worker fatigue

3.Three Categories of Principles The principles of motion economy can be organized into three categories: Principles that apply to the use of the human body Principles that apply to the workplace arrangement Principles that apply to the design of tooling and equipment

4.Use of Human Body The two hands should begin as well as complete their motion at the same time . The natural tendency of most people is to use their preferred hand (right hand for right-handed people and left hand for left-handed people) to accomplish most of the work. The other hand is relegated to a minor role, such as holding the object, while the preferred hand works on it. This first principle states that both hands should be used as equally as possible.

5.Use of Human Body The motions of the arms should be symmetrical and simultaneous and opposite in direction. This will help in balancing the body and there will be less stress on the workers body. Eg- carrying bucket of water in one hand.

6.In the first picture woman is carrying bucket in one hand and her body is imbalanced where as in the second picture woman is carrying weight equally in both the hands so more body balance.

7.The two hands should not be idle at the same time except during the rest period. The work method should be designed to avoid periods when neither hand is working. It may not be possible to completely balance the workload between the right and left hands, but it should be possible to avoid having both hands idle at the same time. The exception to this principle is during rest breaks.

8.Method should consist of smooth continuous curved motions rather than straight motions with sudden changes in direction It takes less time to move through a sequence of smooth continuous curved paths than through a sequence of straight paths that are opposite in direction, even though the actual total distance of the curved paths may be longer (since the shortest distance between two points is a straight line). The reason behind this principle is that the straight-line path sequence includes start and stop actions (accelerations and decelerations) that consume the worker’s time and energy.

9.Momentum should employed to assist the worker whenever possible, and it should be reduced to minimum if it has to be overcome by muscular effort. momentum, which can be defined as mass times velocity. The previous principle dealing with smooth continuous curved motions illustrates a beneficial use of momentum to make a task easier Eg- momentum is used during throwing the ball.

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