|It should go without saying that all work objects -- controls, tools and parts -- should be located within easy reach of the worker. It was Henry ford who said:
The work must be brought to the man; not the man to the work. The work must be brought to the man waist-high. No worker must ever have to stoop to attach a wheel, bolt, screw, or anything else to the moving chassis. Burlingame R: Henry Ford: A Great Life in Brief, p. 75, New York: Alfred A. Knopf, 1966
Yet it is still common to find work objects located such that workers must bend or stretch to the limits of their their capacity to reach for, grasp or use them.
|This page provides some basic information that can be used to determine size ranges for female and male workers, their relative proportions and their abilities to reach objects on a bench surface.|
1. Begin by selecting specifying a standard worker height1 or a custom worker height
|1National Health Survey. For latest data see: https://www.cdc.gov/nchs/data/series/sr_11/sr11_252.pd|
|2 Drillis, R., Contini, R., & Bluestein, M. (1966). Body segment parameters. New York University, School of Engineering and Science.|
Reach distance* = ((Upper Arm + Forearm + Hand Length**)2-(Shoulder Ht - Bench Ht)2))1/2
*Reduce reach distance for belly space.
**Reduce hand length 35% for pinch & 65% for grip.