• MrFinnbean@lemmy.world
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    2 days ago

    Shit, you are right about the tires. I feel kind of stupid now. I ask you now (because of my utter unitrests to start to google anything right now.) How you guys mark the tire sizes? Like we have something like 175/65/14. 175 mm wide, profile is 65% and 14 inch diameter.

    Ratchets tough, never once given even a tough about the size. It was just what fit in what ever bullshit hole it needs to fit and hopefully gave enough leverage. Sockets are in mm and those were the ones I usually needed to worry about.

    Robbins and Lawrence is familiar name from school, but never really given any tought about them, nor i dont think im going to realistically ever travel to Vermont(?)

    • innermachine@lemmy.world
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      2 days ago

      Yea it is strange the consistent proliferation of SAE units globally for certain things like tooling and tires. Not sure where else it is common, I only know about where it affects me on a daily basis with what I do for work. The tires are crazy because the aspect ratio is based off the mm width and the wheel size in inches so now units are being mixed! And square drives (like the half inch chuck key u used to tighten the chuck on ur metric lathe) could just as well be say 13mm instead of half inch, or 10mm instead of 3/8ths but the world just refuses to move on in certain areas. This is to say all the more how badly we need to standardize units of measure globally in our intertwined global world. Robbins and Lawrence was one of the first contractors for us gov to make guns that could be easily repaired with replacement parts in the field (before then all guns were hand filed and built so each part was bespoke, and repairs required craftsmen). When an industry starts with a certain standard (tools, tires, machining) that sets and industry standard which takes precedent over all other standards in that field. This is why all these things have stuck with SAE for so long, but these standards were set 100+ years ago. There is no reason not to move on at this point honestly.