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# Thread: Automated lawnmower rope circular mowing method - GIF

2. ## The Following 5 Users Say Thank You to Jon For This Useful Post:

baja (10-12-2019), dubbby (03-09-2020), Miloslav (10-11-2019), Scotsman Hosie (10-20-2019), Seedtick (10-11-2019)

3. 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.

4. ## The Following 2 Users Say Thank You to mklotz For This Useful Post:

Moby Duck (10-12-2019), Scotsman Hosie (10-20-2019)

5. Drum dia: 1/3 of the cutting blade width okay with you, Marv?

6. Originally Posted by DIYSwede
Drum dia: 1/3 of the cutting blade width okay with you, Marv?
Well, the bible says pi equals three so, yeah, 1/3.

7. Originally Posted by mklotz
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...

8. 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.

9. ## The Following User Says Thank You to Crusty For This Useful Post:

Scotsman Hosie (10-20-2019)

10. Originally Posted by Crusty
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.

11. ## The Following 3 Users Say Thank You to mklotz For This Useful Post:

FEM2008 (10-11-2019), jimfols (10-11-2019), Scotsman Hosie (10-20-2019)

12. Heh heh. Pi are round, cornbread are squared.

13. ## The Following User Says Thank You to Crusty For This Useful Post:

Scotsman Hosie (10-20-2019)

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

15. 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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