IET 335 Lecture : Chapter 11-IET 335

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Guideline 1: avoid static loads and fixed work postures: Static load increases both systolic and siastolic blood pressure due to low blood circulation. Hard floors cause standing fatique and increase heart rate. Use the three-contact rule: three limbs should maintain contact with steps or handles at the same time. Guideline 3: set the work height at 50mm below the elbow. Work is defined in terms of elbow height. Guideline 4: furnish every employee with an adjustable chair. Allow users to try chairs in their specific jobs. Guideline 5: use the feet as well as the hands. 2 legs can provide 3x the power of two arms. Use gravity to move material to the work. Eliminate grasping motions by providing lips, rolled edges, and holes. Guideline 8: use 2-hand motions rather than 1-hand. Guideline 9: use parallel motions for eye control of 2-hand motions. Minimize the degree of spread rather than worry about symmetry of motions.

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