A moment’s carelessness with a power tool or a piece of industrial equipment can lead to horrendous injuries and a lifetime of disability. Moments of carelessness happen because people are not machines: they can be distracted, they can flinch at sudden noises, they can forget to tell a coworker that they are about to turn on the power. Any of these things can cause death or injury in the right circumstances.
We take it for granted in our homes and workplaces that simple, everyday matters shouldn’t result in death or horrible injury. We insulate electrical wires and hide them in walls. We ground power tools. We look for ways that common tasks are likely to result in injury, and come up with ways to prevent them. Our efforts aren’t foolproof, but we have reduced the number of injuries caused by moments of carelessness.
The potential for modern power tools, industrial equipment, and other products to cause injury in a moment of carelessness makes it imperative that they be designed properly. They must be designed to account for the fact that the operators are human. Many mistakes, many acts of carelessness in the use of a tool or other product, can be anticipated in the design phase. If they can be anticipated, then controls and safety mechanisms can be designed to protect against them. Careful, responsible manufacturers do this religiously, but sometimes they fail.