By B. Shackel (Auth.)
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Extra resources for Applied Ergonomics Handbook. Volume 1
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The items considered most important for the task involved; 2. the items used most frequently in regular operation; 3. any items used together in a sub-sequence (eg ignition, choke and starter); 4. any items related to each other by function (eg wipers and washers, or heater on-off, air distribution and fan). Applied Ergonomics Handbook 39 fi The lists are not mutually exclusive and several items may appear in more than one category. In designing the layout, those items on the important and frequently-used lists are placed near the centre of the console or machine, in easily accessible and well differentiated positions.
12) Diameter-minimum l O m m f t in) maximum 100 mm (4 in) Depth - minimum 12-5 mm (Vi in) maximum 25 mm (1 in) If the adjustment required of the knob is critical, a round knob of at least 50 mm (2 in) diameter should be used, because there is a limit to the sensitivity of movement of the operator, and a larger knob allows bigger movements at the edge of the knob for fine adjustments. Knobs which are less than 19 mm (% in) in depth should be knurled rather than serrated to provide adequate gripping surface.
Recommendations for controls — B There are no specific recommendations in the literature for controls to be used for switched adjustment when position is unimportant. They should, however, comply with the general recommendations of size for continuous controls. Many of the knobs suitable for continuous controls could be used for this latter purpose, but knobs with ridges or ears are to be preferred. Gripping surfaces should thus be adequate to allow for the torque of the switch; a maximum torque of 2-5 nm (22 in lb) should not be exceeded.