By B. Shackel (Auth.)
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Extra info for Applied Ergonomics Handbook. Volume 1
If panel space is very limited, the use of minimum values for knob size will not degrade performance provided the resistance is very low. For diameters up to 63-5 mm (2Vi in) the torque should not exceed 0 2 nm (2 in lb). 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.
28 Applied Ergonomics Handbook • those which are used only occasionally and where power-operation is considered unnecessary. • those which are operated by hand-tools during maintenance work. The amount of force which an operator can exert by a given limb varies with his posture and with the length of time during which he has to apply force. When he applies it to either a hand- or foot-control, the rest of his body must provide a stable base from which to work, and his feet and trunk must be satisfactorily supported to resist movement.
It is sometimes essential to provide local support so as to stabilize the hands or feet as they make fine control adjustments, particularly in conditions of vibration and jolting. This can often be achieved by using a knob instead of a lever, so that the operator steadies his hand by grasping the control and the turning movement is then relatively unaffected by any jerking motion applied to the man or the machine. An operator can also steady himself by using the right and left limbs in opposition to one another, as in operating the rudder bar of aircraft or the steering wheel of a car or tractor.
Applied Ergonomics Handbook. Volume 1 by B. Shackel (Auth.)