Equations of Hand Motion Path for Work Space Design

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Abstract
This work developed a set of prediction equations for three-dimensional motions of the human hand, thus facilitating the design of the dynamic elements in work space. The variables considered were the distance moved and the direction of motion. It was concluded from the results that: (a) it is possible to develop accurate prediction equations for three-dimensional motions of body members; (b) distance has only a negligible effect on motion path; (c) the effect of direction on motion path is uniform except for the 90° motion; (d) only two sets of equations, one for 90° motions and the other for motions in other directions, are required to predict the path of any motion in the experimental region; (e) the overall length of motion path is only slightly more than the linear movement distance; and (f) the depth dimension in a three-dimensional motion is negligibly small.

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