Machine guarding is often thought of as something associated with industry and manufacturing plants. It is true that the potential for hazards from machines is greater in those settings. But even in our homes we often have machines where safety guards have become common. Our garage doors have sensors so that if anything cuts the plane of the door the opener will reverse the action and open the door. Riding lawnmowers have seat interlocks to shut down the engine when we get off the mower. Table saws have sensors to shut the blade off quickly if it comes in contact with a finger. And even kitchen appliances like a food processor have interlocks to keep clumsy home operators from cutting their fingers.