(b)
Figure 33-7. Example of a biomechanical analysis of the forearm and hand. (a) The reaction force at the elbow must equal the sum of that produced by the forearm and hand. The muscles balance the moment created by the forearm and hand and the weight. (b) The forces and moments are simplified in a free-body diagram.
location and arrangements of components. Items should be placed within reach and view
and they should be organized to distribute tasks between hands or between hands and feet.
Importance Principle How important a component is to the overall operation of a system must be considered. Important components should be directly in front of an operator. There are several schemes to judge importance.