Principles of Motion Economy

Motion Economy

Motion economy helps achieve productivity and reduce Cumulative Trauma at the workstation or sub-micro level. The Principles of Motion Economy eliminate wasted motion, ease operator tasks, reduce fatigue and minimize cumulative trauma such as Carpal Tunnel and tendonitis.

Use of the Human Body

1. The two hands should begin as well as complete their motions at the same time.The two hands should not be idel at the same time except during rest periods.
2. Motions of the arms should be made in opposite and symmetrical directions and should be made simulataneously.
3. Hand and body motions should be confined to the lowest classification with which it is possible to perform the work satisfactorily.
4. Momentum should be employed to assist the worker wherever possible, and it should be reduced to a minimum if it must be overcome by muscular effort.
5. Smooth continuous motion of the hands are perferable to straight line motions involving sudden and sharp changes in direction.
6. Ballistic movements are faster, easier and move accurate than restricted (fixation) or controlled movements.
7. Work should be arranged to permit an easy and natural rhythm wherever possible
8. Eye fixations should be as few and as close together as possible.

Limitations of Motion Economy

Motion economy has limitations. It does not account for physical limitations or differences in operators. Moreover,a movement that appears ineffective from a motion economy perspective actually may prevent fatigue and possible injury from static posture loading. However, using them alongside Principles of Ergonomics and a rationalized design procedure will ensure a productive, safe and optimum workstation.