Principles of Work Design: Machines and Equipment



• Take multiple cuts whenever possible by combining two or more tools in one, or by arranging simultaneous cuts from both feeding devices



• Use a fixture instead of the hand as a holding device



• Locate all control devices for best operator accessibility and strength capability



• Use shape, texture and size coding for controls



• Use proper control size, displacement and resistance



- Control-response ratio (C/R ratio)

amount of movement in a control / amount of movement in the response

- Range effect – the tendency to overshoot short distances and undershoot long distances

- Control - resistance feedback



• Ensure proper compatibility between controls and displays

Compatibility – relationship between controls and displays that is consistent with human expectations