![]() ![]() The average robot mower (there are some exceptions) uses multiple small steel pieces, each about the size of a razor blade, to remove very small amounts of grass over many days and multiple passes. A robot mower’s action is closer to shaving the grass down than cutting it down. ![]() The cutting action of a robot mower is different than the typical walk-behind mower, which spins a large steel blade designed to cut an inch or more of grass in a single pass. Some mowers have removable batteries, so you can swap fresh ones in to keep the mower going while you charge the dead ones separately. When its battery is nearly depleted, the mower heads to the station for recharging, which usually takes one to three hours. As the mower approaches the wire, it picks up the signal, stops, turns around, and heads off in another direction. It also contains a generator that sends a low-power signal out on the wire. That wire leads to a charging station, which is plugged into a 120-volt exterior outlet. Most require you (or the dealer) to bury a wire in the lawn that forms a perimeter within which the robot mower will cut. How a Robot Lawn Mower WorksĪ robot mower consists of a plastic chassis, on which are mounted mower heads, a battery, drive motors, and one or more circuit boards to assess ground speed, direction, tilt, and obstacles. After spending many, many hours mowing lawns, I am content to let the robots take it from here. I’m also constantly taking on new projects to improve things in and around my rural Appalachian Pennsylvania home, and there’s little I can’t build or fix. ![]() Show more The Expert: I’m a freelance journalist whose work has appeared in The New York Times, The Wall Street Journal, The Washington Post, and many other places.
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