Any question answered...

Ok, so because the pivot point is not central the top bit moves more.

That's pretty clever. You should patent that

Sketch a Graph..... Remember them as a kid in the 60's :)

The only problem is that the bottom one goes in the opposite direction to the top, as there’s only one pivot. I imagine an actual engineer will know many more, superior solutions.
You could do this with gears:
Input 1 is connected to gear A
Output 2 is connected to gear B
Gear A and B and connected, and B has 5x the amount of teeth that A does. So any movement of 1 will result in 2 moving 5x as much.

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Bah, you're right. I didn't look close enough :(

I'd like to clean this (I assume steel) bottle opener a bit without damaging the lettering. Any suggestions on the best way to do that?

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Max most will do is 25kg, finding a bigger one is difficult. Mainly because at 25 kg you go in a car yeah?

I think the reason is 25kg and above is something to do with car seats.
Another example of the carcentric lobdon liberal hating world I live in.

Soapy water and tin foil?

Just start off with some metal polish like Autosol. Start with a pea sized spot on a rag and give it some elbow grease. Then get a clean rag and buff it up until it starts to look brighter. Repeat those steps until you're blue in the face and it should come out well.

Next level would be using small polishing wheels on a dremel but you probably won't need to go that far.

Hydraulics.

Something like this? I use one on my ancient kitchen knife and various tools. Works pretty well. You're welcome to borrow mine if you can get to SE20 or E14.

https://www.woodandmeadow.com/products/crean-mate?currency=GBP&variant=12317827006548&utm_medium=cpc&utm_source=google&utm_campaign=Google%20Shopping&gad=1&gclid=Cj0KCQjw3JanBhCPARIsAJpXTx5606Nby5cSXgURH_F5xnfEoTOU_xyUbggnGkwBhYKjx-O0fSYHYt0aAuYhEALw_wcB

Citric acid / coca cola bath first
Then polish?

can increase horizontal movement?

Depends on whether you want a true ratio or not. The simple pin-jointed linkage gives a good approximation, but it gets worse as the angle of articulation increases. Good enough for a huge range of practical machinery, but not for instrumentation.

The racks and coaxial pinions method gives a consistent ratio throughout the range of travel, but has higher friction and more backlash unless you literally build it instrument grade. Some instruments do use such a system due to the elimination of the cosine error inherent in simple pin-jointed linkages.

An hydraulic system gives a true and consistent ratio, but it's very costly to adjust the ratio later, if that's a consideration. It's generally not suited to instrument grade precision due to elastic effects, although they can be almost eliminated by coupling the two cylinders very closely, either side by side or in tandem. TRP HY/Rd brakes are an example of close coupled cylinders used to translate a long input into a short output. They are simplified as they only have to operate in one direction, but double acting systems can be built.

m is that the bottom one goes in the opposite direction to the top, as there’s only one pivot.

You can rearrange the same number of articulation points to give an output in the same direction as the input, or by using a bell crank instead of a straight link in any arbitrary direction between the two

Think seat is only rated to 22kg anyway.
The benefit is having a seat that mounts on and off a rear rack so easily and quickly, and doesn’t leave a massive mounting point awkwardly sticking out when not in use. Also means you don’t need any extra hardware to use it on multiple bikes (provided they have a rack).

Or just put the pivot at one end and input and output on the same side!

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put the pivot at one end and input and output on the same side!

That was the meaning of my comment, thanks for drawing your own conclusion🙂

Oh yeah, I know your pain. I really do.

Ha, it was your comment that lead me there. After being distracted googling bell cranks.

^ ^^ Thanks both for the mechanics lessons

Have I been misusing the word "aesthetic" all my life, or has it changed a bit?

I'd previously understood it to refer the visual properties of a thing - something could be aesthetically pleasing or not, or have positive or negative aesthetics.

However I keep seeing people refer to things as aesthetic, e.g "that's aesthetic" or "how I became aesthetic".

Am I daft or is that sort of thing a new use of the word? The second example seems equivalent to saying something like "how I became height".

Edit to add I do not think these people are confusing aesthetic with ascetic.

I think it's new usage, my daughter uses it like your second example and I assume has picked it up from tiktok and other youths

Just typed out a long response and then my phone died and I lost it, lol.

But here goes again! It’s both an adjective and noun, if that helps.

So, both “x is aesthetic” and “x has an aesthetic”
Like “x is smelly” and “x has a smell”.

Say there was some really cool cutlery in a restaurant you were at. You might observe that the interesting design choices like shape and colour mean that “this cutlery has an amazing aesthetic” or you could pick up the fork and be like “this fork is so aesthetic”

But when someone says “I started being aesthetic” it’s essentially saying “I started looking cool” but it infers that they’re trying to embody an attitude promoting aesthetics in their lifestyle, which is a fancy way of saying “looking cool, buying cool things, acting cool” etc etc.

I hope that makes a little bit of sense, as I’m neither hip or articulate enough to explain it very well.

And it also reminds me when I was at uni studying art. You weren’t allowed to say “nice” when describing things, but you could say “aesthetically pleasing” despite the fact that you were basically saying the exact same thing. And ironically, if one of our group described something as nice, it was actually a really good compliment as it was a no strings attached positive endorsement. Way better than “I love what you’re doing with the blah blah blah blah”.
Nice is nice.

That’s so preppy.