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Robot Lawnmowers

| Items & Materials: Selling for More Than Scrap Value

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    Breakage started this thread.
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    Update: I tore into one of them and found some neat stuff, though the jury is out as to whether or not it was worth it. There are five Johnson Electric motors (one for each of the three blades and a driver apiece for both wheels) of an uncertain voltage. It's a 24v system but the motors don't show any markings indicating electrical specs. Each motor is about the size of a 6v battery. Unfortunately, I don't think I can get the blades or their motors out, intact. They fit into the deck using a 360° ratcheting screw for which the manufacturer produces a unitasking tool to remove them and that's not a thing I am going to buy. I will spend another few minutes trying to remove them carefully but it seems likely I will have to cut away the plastic mower deck. Total weight of motors should be exactly 7.5#, though they are in excellent shape and may have better resale value. Further research into the aftermarket value of these mowers shows a very small but dedicated DIY following, similar to model plane enthusiasts.

    There is also a good-sized and and seemingly high grade motherboard, about a pound of wire, odometer boards, sensors, a couple of iron blobs for front-end ballast, and lots of POM gears. The shell is durable polypropylene, resin coded for easy recycling. Finally, beneath the front and back bumper covers, there is a two-foot strip of non-mag stainless, wired in circuit, which I believe is used as the primary sensor surface (hypothesis: When the bumper contacts an object, it compresses against the steel, causing a drop in current due to physical resistance, which the mower interprets as a sign to turn away from the object and continue in another direction).


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