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Thread: Automated lawnmower rope circular mowing method - GIF

  1. #1
    Jon
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    Automated lawnmower rope circular mowing method - GIF


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    Supporting Member mklotz's Avatar
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    I guess he's never heard of Archimedean spirals. Replace that rod in the center with a 55 gallon drum or similar and it would cut the whole patch instead of cutting and recutting the same path.
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    Supporting Member DIYSwede's Avatar
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    Drum dia: 1/3 of the cutting blade width okay with you, Marv?

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    Supporting Member mklotz's Avatar
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    Quote Originally Posted by DIYSwede View Post
    Drum dia: 1/3 of the cutting blade width okay with you, Marv?
    Well, the bible says pi equals three so, yeah, 1/3.
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    Supporting Member DIYSwede's Avatar
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    DIYSwede's Tools
    Quote Originally Posted by mklotz View Post
    Well, the bible says pi equals three so, yeah, 1/3.
    Just wanted some safe overlap, but then that's just me - as my late granddad hated to see any ridges in a freshly cut lawn...
    Last edited by DIYSwede; 10-11-2019 at 12:14 PM.

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    There's a bunch of silly physicists that still use 22/7 for most calcs. It's close enough when you're usually starting with data that has a 10% or greater error band built in.
    If you can't make it precise make it adjustable.

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    Supporting Member mklotz's Avatar
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    Quote Originally Posted by Crusty View Post
    There's a bunch of silly physicists that still use 22/7 for most calcs.
    Well this physicist doesn't. I long ago memorized pi to the number of places the computers of my younger years could handle - 3.1415926535898

    But if you want a rational fraction approximation, the best one is 355/113 = 3.14159292035, an error of 0.000008491 % !

    The mnemonic I used to teach my duller students was to write down the first three odd numbers twice in a string (113355) and split it down the middle to form two three digit numbers (113 355). If you can't figure out how to divide these two numbers to get a number close to three, you have no business fooling around with advanced mathematical concepts like pi.
    Last edited by mklotz; 10-12-2019 at 08:45 AM.
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    Supporting Member Crusty's Avatar
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    Heh heh. Pi are round, cornbread are squared.
    If you can't make it precise make it adjustable.

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    I was gonna say, I used to make a really tasty pecan pi. Recipe was on the back of a Karo syrup bottle.

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    Supporting Member Frank S's Avatar
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    I tried that lawnmower on a rope trick when I was a kid but I couldn't get my younger sister to push the reel type push mower for more than 1 revolution so gave it up as a bad idea


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