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A pole is set in the middle of a fairly flat, square yard. A spool the width of the mower blade
(simple method) or reel with a timed "draw" calculated to the width of the mower blade(complicated method) will draw the self propelled mower toward the pole as the rope shortens as it wraps around the
reel, or as the reel pulls the mower towards the center pole in a calculated manner. This would operate much much like a control line model airplane which has its rudder set to make a turn towards the outside of the circle in order to maintain tension on the control line. The mower would be attached so that it would tend want to travel outside the circle, in order to keep the line taught at all times. Unless the mower were automated with more electronics, it would have be observed in order to switch the mower off when it reaches the end of the rope. An automatic switch could be fashioned to detected a loss of motion when the mower reached the end of the rope, in order to turn the mower off.
Obviously this mower will only cut a circle and will not cover the entire yard. Manual mowing and trimming will be needed to manicure the corners and edges after the automaton is finished.
Robot lawn mower
http://www.friendlyrobotics.com/
does the whole lawn, not just a circle in the middle [Bad Jim, Jun 25 2008]
Red Green Show, Episode 295, Season 15
http://www.tv.com/t...e/583910/recap.html
I think this is what iron_horse was referring to. [jutta, Jun 25 2008]
[link]
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"Low tech don't mean no tech" (+) |
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Minor correction: The spool would need a circumference equal to (preferably slightly less than) the diameter of the cutting blade.
A spool with diameter equal to the cutting blade will only allow the mower to cut 1/(pi) of your lawn. |
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I don't see how you're gonna cut a square lawn, but [+] |
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Baked, exactly as described, on an episode of the Red Greene Show. |
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Nifty idea. Unfortunately one of the twenty people in the world who have seen the RedGreen show happened along to call it baked. |
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