this post was submitted on 13 Oct 2024
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The world has a lot of different standards for a lot of things, but I have never heard of a place with the default screw thread direction being opposite.

So does each language have a fun mnemonic?

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[–] 418_im_a_teapot@sh.itjust.works 37 points 1 month ago* (last edited 1 month ago) (69 children)

This phrase has never made any sense to me. It’s a circle. If one side is moving right, then the opposite side is moving left. So the phrase only makes sense if you specify which side we are talking about, which nobody ever does. Therefore it’s completely illogical to me while everyone else just gets it. Side note: Autism can be a real bitch sometimes.

Edit:

  1. Some people don’t understand how I can see a problem. That’s cool, but don’t be a dick. We all look at the world through different lenses.
  2. This is when I was a kid “helping” my grandfather in the garage. I’m older now and understand that “righty tighty” references the top of the rotation.
  3. Some people rotate their perspective 90° and imagine themselves standing on the screw. Therefore when your face rotates to the right the screw is tightened. I hadn’t ever thought of that. But I had imagined rotating my perspective 90° the other direction –the top of my head as a screwdriver. In that case, “lefty tighty”
[–] Backlog3231@reddthat.com 13 points 1 month ago (51 children)

But the entire rotation is either clockwise (right) or counterclockwise (left). Ultimately, its just a helpful reminder which way to turn lol

[–] 418_im_a_teapot@sh.itjust.works 21 points 1 month ago (50 children)

Clockwise and counter-clockwise makes sense.

But when you say “right” it’s not clear which side of the circle is being referenced. If the top of the circle is moving to the right, the bottom is moving left at the same time. So the saying only makes sense when you specify that you’re talking about the top of the circle.

[–] underisk@lemmy.ml 1 points 1 month ago (2 children)

Imagine it as if it were a track you were driving around, which way would you turn the wheel?

[–] BeardedGingerWonder@feddit.uk 8 points 1 month ago (2 children)

It's getting so convoluted at this point just knowing clockwise/anticlockwise is infinitely easier.

[–] 418_im_a_teapot@sh.itjust.works 2 points 1 month ago

Yes! That concept makes way more sense.

[–] CanadaPlus@lemmy.sdf.org 0 points 1 month ago (1 children)

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 1 points 1 month ago (1 children)

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 0 points 1 month ago* (last edited 1 month ago) (2 children)

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 2 points 1 month ago* (last edited 1 month ago) (1 children)

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 1 points 1 month ago (1 children)

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 1 points 1 month ago (1 children)

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 0 points 1 month ago (1 children)

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.

[–] underisk@lemmy.ml 1 points 1 month ago

You don't really need to visualize yourself on the rim, either. Just turn left in any context and you will trace the path of an anticlockwise circle. It's really more about establishing why there's a link between left and anticlockwise. Picture and remember whatever works best for you, I'm just annoyed by the people stubbornly insisting the link between them doesn't make perfect sense.

[–] KeenFlame@feddit.nu 1 points 1 month ago

One of them is "wrong" and would kill many people

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