HalcyonKnights

HalcyonKnights t1_j5vn7uy wrote

As of 2019 the US was the 3rd largest Phosphorus Exporter, (way) behind Vietnam and Kazakhstan. We have so much Phosphate we also use it to hyper-age our Chickens, nevermind crop farming. Granted a lot of that comes from open pits mines in areas that were seafloor few hundred million years ago, so it's definitely "Non-renewable".

https://wits.worldbank.org/trade/comtrade/en/country/ALL/year/2019/tradeflow/Exports/partner/WLD/product/280470

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HalcyonKnights t1_itpzrlf wrote

I would not try to reinvent that Wheel (unless you want to spend more time and money on the learning experience).

Mechanical (Rotating Shaft): https://www.amazon.com/Mechanical-Counter-0-999999-Resettable-Accurately/dp/B0975Y79RF/

Mechanical (Paddle Whack method): https://www.amazon.com/KTRIO-Counter-Handheld-Clicker-Mechanical/dp/B075QFK6DG/

Electronic: https://www.amazon.com/DIGITEN-Digital-0-99999-Proximity-Magnetic/dp/B01DNLRAUA

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HalcyonKnights t1_itpx98g wrote

Make your measuring "pulley" more of a flat-sided barrel and wrap the thread around it a few times before it goes onto the spool. That will maximize the friction and keep it moving, but keep the thread on a single layer where the diameter wont change your measurement. If you are 3D printing (or even if not) you can get really cheap skateboard bearings that you can put into the design too if you need to, especially if it's thin thread that ends up breaking on you. A separate, adjustable tensioner (spring or weighted, maybe) would probably be a good idea too.

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