• CanadaPlus@lemmy.sdf.org
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    2 hours ago

    So you’re explaining rotation, in terms of a smaller imaginary rotation, which engages with imaginary traction wheels, which engage with the work to be turned?

    If that works for you, great, but it is complicated.

    • underisk@lemmy.ml
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      2 hours ago

      No im trying to illustrate the parallels between how you turn the wheel, how the car turns in response to that , and how they are all related. You turn left you will make the exact same rotational movement, with both the vehicle, and the steering wheel.

      It’s as simple as, “What direction do you turn the wheel to make the car go left?” I just stacked on top “and also it makes the car itself do that same exact circular movement” so you don’t just dismiss this as some kind of arbitrary convention.

      • CanadaPlus@lemmy.sdf.org
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        1 hour ago

        Oh, I see.

        Car steering wheels work that way because of the convention. Change the side that the steering column’s pinion meets the rack and the wheel would work the opposite way. From the mathematical perspective, there’s two ways to continuously map an arc of the steering wheel to an arc of the wheels, and since they aren’t in the same plane neither is “wrong”.

        • underisk@lemmy.ml
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          1 hour ago

          i know you can make the wheel work the opposite way, jesus christ. the circle motion the path of the car makes when you turn left is the same as when you turn the wheel to the conventional left. imagine, instead you steered “left” by a joystick. the car would still draw the same circular path the same fucking way, because turning left makes an anticlockwise circle, every time, in every situation.

          • CanadaPlus@lemmy.sdf.org
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            44 minutes ago

            Ah, so the car isn’t even important. You’re one of the people imagining standing on the screw. As long as you have a convention about which way is “up” on it, that does work.

            • underisk@lemmy.ml
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              40 minutes ago

              You have to have a convention about Up to usefully describe a rotational direction at all. I don’t see how that’s relevant. Left implies an Up.

              • CanadaPlus@lemmy.sdf.org
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                23 minutes ago

                Yes, it’s true, you do. Left doesn’t really imply an up so much as it comes as a package with one, though. I’m not OP, but historically I had the same issue. I just didn’t automatically jump to “in is down, and I’m on the rim”, and instead was thinking about my actual physical left and right at that moment.