How pencil tire pressure gauges work
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How pencil tire pressure gauges work
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Re: How pencil tire pressure gauges work
#2To me, the fact that these things are omnipresent for 99 cents is just as much proof that our species can do pretty much anything, as much as it is that we have levitating trains.
Re: How pencil tire pressure gauges work
#3This is interesting. I read this link because I've been curious about exactly how these work, and I like knowing that sort of thing.
Turns out, it works precisely how I would have expected it would work, and indeed, probably using the first approach I would have used for designing such a thing (granted, I'm not a mechanical engineer.)
Most things I learn about do NOT fit expectations that well. Truly a simple, practical device.
Also, incidentally, all the pencil gauges I have are +/- 5 psi relative to my digital gauge, so despite all these balances it might only be an approximate technique after all.
Re: How pencil tire pressure gauges work
#4To me, the fact that these things are omnipresent for 99 cents is just as much proof that our species can do pretty much anything, as much as it is that we have levitating trains.
These things are very cheap to produce, don't have a lot of parts, are small and light (cheap to transport).
A few days ago I bought a 12V air compressor (for filing car tires) for 6.99€ (it was a reduced price, but at a store where everything is always reduced... the base price was 9.99€)
So... 22% VAT removed, then the sellers margin, shipping a not-that-small box from china... then you add the shell packaging, papers inside, the electronics, the motor, the pump part, pressure gauge, plastic shell... then you have to account for all the fauly ones..
I honestly have no idea how they can make something that cheap.
Re: How pencil tire pressure gauges work
#5This is interesting. I read this link because I've been curious about exactly how these work, and I like knowing that sort of thing. Turns out, it works precisely how I would have expected it would work, and indeed, probably using the first approach I would have used for designing such a thing (granted, I'm not a mechanical engineer.) Most things I learn about do NOT fit expectations that well. Truly a simple, practi…
I had "Unusual sources of energy" class at University. One day we were sitting in the classroom, the teacher was there but the class didn't started yet. I was eating one of those extruded styrofoam cracker and I noticed on the packaging there was a nutrient information, I converted it 1:1 to electric energy and calculated that one cracker could power single LED diode for 6 months. It seemed wrong so I told it to the teacher and asked him how they actually calculate the energy of various foods and when he said they burn it, I bursted into laughter because I honestly imagined some more sophisticated method.
Re: How pencil tire pressure gauges work
#6I don't think I've ever seen one up close, so I assumed it had to do with how fast the air rushes out, in a way overcomplicated way.
I thought maybe the design was such that the farther away it was, the less it would get blown on, and a given pressure would be able to make a certain amount of inertia before it was too far.
For some reason I imagined people had to manually push it back in and reset it, so there couldn't possibly be a spring.
I didn't even know they had springs at all! I'm sure I would have figured it out if I had examined one though, since it's basically a piston on a scale.
Re: How pencil tire pressure gauges work
#7Always wondered how these actually work.
What's up with the writing? Its written like a children's book, I had to pause reading to scan around a few times feeling a bit self conscious that I was on a kids explainer website.
Re: How pencil tire pressure gauges work
#8Always wondered how these actually work. What's up with the writing? Its written like a children's book, I had to pause reading to scan around a few times feeling a bit self conscious that I was on a kids explainer website.
It's very very weird. Also seems like they are making it all up based on their assumption of how the internals could fail. Kind of feels like SEO content to me.
Re: How pencil tire pressure gauges work
#9Always wondered how these actually work. What's up with the writing? Its written like a children's book, I had to pause reading to scan around a few times feeling a bit self conscious that I was on a kids explainer website.
It's very very weird. Also seems like they are making it all up based on their assumption of how the internals could fail. Kind of feels like SEO content to me.
Hopefully it's not AI generated
Re: How pencil tire pressure gauges work
#10This is interesting. I read this link because I've been curious about exactly how these work, and I like knowing that sort of thing. Turns out, it works precisely how I would have expected it would work, and indeed, probably using the first approach I would have used for designing such a thing (granted, I'm not a mechanical engineer.) Most things I learn about do NOT fit expectations that well. Truly a simple, practi…
I had "Unusual sources of energy" class at University. One day we were sitting in the classroom, the teacher was there but the class didn't started yet. I was eating one of those extruded styrofoam cracker and I noticed on the packaging there was a nutrient information, I converted it 1:1 to electric energy and calculated that one cracker could power single LED diode for 6 months. It seemed wrong so I told it to the…
I believe they no longer use the burning method [1] for measuring food energy, since it overestimates energy of high-fiber foods (fiber doesn't get burned when in the body, but it does get burned during measurement.) I believe nowadays they estimate the caloric content based on the fat, carbohydrate, and protein content of the food.