• kurap1ka@lemmy.world
    link
    fedilink
    arrow-up
    3
    ·
    2 年前

    Oh just wait until you see imperial hex screws. In metric you get them in screwdriver size relating to mm. US hex screws are like 16/64 of an inch or 5/16 of an apple. And of course they don’t relate to metric at all and you can’t use the same tools.

    • ChaoticNeutralCzech@feddit.de
      link
      fedilink
      arrow-up
      2
      ·
      edit-2
      2 年前

      Or fucking AWG. Higher number means smaller diameter wire, and Americans are afraid of decimal or negative numbers so large diameters are 00, 000 etc. The formula is batshit insane
      𝑑𝑛 = 0.005 in × 92^(36 – 𝑛)/39^
      so people just use a lookup table.

      • ultracritical@lemmy.world
        link
        fedilink
        arrow-up
        2
        ·
        2 年前

        Gauge is historically number of passes through gauging machine. With the machine and material in question being different for every single one. We took that and put it to a standard, so it’s super messy and makes no sense.

        • ChaoticNeutralCzech@feddit.de
          link
          fedilink
          arrow-up
          1
          ·
          2 年前

          Well, I wonder what kind of gauging machine can do -3 passes for 0000 wire… /s

          Too bad AWG is so ubiquitous it’s starting to creep into Europe.