VOLUMETRIC WORKSPACE STUDY. PART II. OPTIMUM WORKSPACE CONFIGURATION FOR USE OF WRENCHES.
AEROSPACE MEDICAL RESEARCH LABS WRIGHT-PATTERSON AFB OHIO
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The study was conducted to establish the functional relationship between available workspace and the time required to remove and to replace two self-locking hexagonal nuts. The experiment involved the following variables a wrench type, a 6-inch long open-end or 7-inch long ratchet b workspace depth, 15, 30, and 45 cm 6, 12, and 18 inches c aperture size, 20, 25, 30, 35, and 40 cm 8, 10, 12, 14, and 16 inches and d task location within the workspace left side, right side, top, bottom, or rear. Twenty-one subjects were divided into three groups of seven subjects each. For a given group, depth was held constant as subjects using their right hand performed the task under 25 different conditions. These conditions were determined by the combination of five aperture sizes and five different task locations. The 25 conditions were performed twice, once using the open-end and once using the ratchet wrench. Major results of this study within the range of conditions explored are as follows. First, regardless of the type of wrench used, work times decreased as aperture size increased. However, increasing aperture size beyond 30 cm 12 inches did not appreciably shorten work times. Work times using the ratchet wrench were considerably faster than those obtained with the open-end wrench. Second, the best overall performance times were obtained at the rear location. The next best times were obtained at the left side and bottom locations, while the right side and top locations yielded the worst times. Author
- Human Factors Engineering and Man Machine Systems