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How a car cigarette lighter works, in CT scans
- Arainach 2y agoIt's a cool explanation, but I'm not sure what a CT scan offers that cutting it in half with a bandsaw wouldn't.
- kube-system 2y agoWhen all you are is a hammer manufacturer, all your demos look like nails.
- mrguyorama 2y agoIn which case the question gets inverted: Why of all common things you could CT scan and show people, you choose something that is kinda obvious to anyone who has thought about it for five seconds? I don't think average people struggle to understand the concept of "electricity makes wire hot", especially if they lived at the same time as normal car cigarette lighter usage.
- kube-system 2y agoLumafield posts tons of these. I don't think the average person has thought at all about how these work, and even if they do, the appeal of these is to look at the pretty pictures (and demonstrate the analysis that is possible non-destructively to their target audience), not to understand "electricity makes wire hot". They have a scan of a dang football, and it isn't because people don't know there's air inside: https://www.lumafield.com/article/ct-big-game-football https://www.lumafield.com/article/ct-big-game-football
- ssl-3 2y agoThose who have thought about it for more than five seconds understand that there is more going on inside of a normal car cigarette lighter than "electricity makes wires hot."
- beaglesss 2y agoIR heat profile might have been cool. It's a shame cars don't come with them anymore. A lighter can save someone's life and cost next to nothing. You can toss a lighter in but something about the designated electric plug is pleasing and invites you not to lose it.
- peterleiser 2y agoYes, very handy even for non-smokers. We have a 2015 vehicle that we bought used that came with a cigarette lighter. I removed it and put it in the glove box.
- Terr_ 2y agoIt's a scanner company showing off their scanners, they don't sell bandsaws. :p That said, it's a kind of marketing I like, since it does have some underlying product-performance and educational virtue to it.
- floatrock 2y agoSame reason every coding tutorial -- no matter the capabilities of the language -- starts with a simple "hello world". Learn with a simple toy example before moving onto the industrial-grade deconstruction that really shows the power of the tool. These guys have done CT scans of things like real vs. fake airPods and charger bricks to show what really justifies their (probably) 7 or 8-figure price tags. This one is just content marketing of something anyone can wrap their head around.
- aaron695 2y ago[dead]
- kube-system 2y agoSeeing clever, simple, and reliable mechanisms like this make me think that digital electronics has really enabled modern engineers to be lazy.
- mystified5016 2y agoWell, yes but. Mechanisms like this can be extremely difficult to design. You have to go through many iterations to tune the performance and ensure it's reliable over a vast range of conditions. Then you have to do it all over again to make the design mass-manufacturable. The design is extremely sensitive to the quality of the input materials and could outright fail if not manufactured just so. It requires a lot of education and ""real"" engineering. It takes a lot of very expensive engineer hours. Meanwhile the digital equivalent is a weekend project at best, and can be designed by just about anyone with half a brain and one working eye. I agree that mechanical mechanisms are almost always much more elegant and simple than a digital equivalent, but given that the digital versions exist and perform nearly as well (if not better), the pure mechanical solution just isn't practical. I'm not entirely sure if this is a good or bad thing. It certainly feels like we've lost an art form, but are we simply moving from flint arrows to steel, or something more like the loss of Roman concrete?
- kube-system 2y agoI think it's more like Roman concrete. There are many creative engineering possibilities that simply aren't used anymore because there are so many jellybean parts on the shelf that can brute-force a solution without much creativity. Much in the same way, I find many software engineers these days don't actually know much about how a computer or a computer network works. Engineering is starting to become less about being masters of the physical world, and more like a discipline in gluing blocks together.
- gwbas1c 2y ago> this design, developed in the 1950s, is entirely analog Uhm, how is this analog? Perhaps "electro-mechanical?" Is there such a thing as a "digital cigarette lighter?" It's not like the electric circuit is an analog of the act of lighting a cigarette; as opposed to what we commonly use the word "analog" to mean that something in the system is an analog to what's being recorded or processed. (IE, in analog tape the magnetic signal is an analog to the real signal, or in analog TV the signal is an analog to the brightness of the picture at a specific moment in time.)
- moolcool 2y agoIt's a valid distinction of the author to make. I don't know if there's such thing as a cigarette lighter which uses digital circuitry, but there theoretically could be. The way the lighter in the article works is both analog _and_ electro-mechanical.
- gwbas1c 2y agoNo, go look at the definition: https://www.dictionary.com/browse/analog https://www.dictionary.com/browse/analog > of or relating to a mechanism, device, or technology that represents data by measurement of a continuous physical variable, as voltage or pressure.
- moolcool 2y ago"represents data by measurement of a continuous physical variable" Did you read the article? The cigarette lighter represents data (pops out) based on measurement of a continuous variable (temperature)
- gwbas1c 2y agoYes. The latch is a bi-metallic strip that moves. There is nothing representing the temperature. IE, to meet the definition of analog it would need something like a thermometer resistor where the resistance is used by some electronics to turn off the main heater.
- big-green-man 2y agoComputation on the bare metal of the universe, no abstraction or emulation required. I love it.
- sorokod 2y agoI think that analogy to programming then and now is very fitting.
- wumms 2y ago> You might think such a system would involve a thermostat, a microcontroller, and an actuator, but this design [...] has bimetallic arms with steel on the outer surface and copper on the inner surface. As the filament heats up, the arms warm up, causing the copper to expand faster than the steel. This expansion pushes the arms open, releasing the lighter. The coil spring then causes the handle to pop out, signaling that the lighter is ready. Maybe I am in a picky mood, but for me the intro made it sound like all three items (thermostat, microcontroller, actuator) would not be necessary, though of course only the microprocessor is missing from the design (thermostat -> bimetallic arms, actuator -> spring). Mandatory link to another marvel in the same problem space (I found the 19min video worth the time): "An Antique Toaster That's Better Than Today’s [video]" https://www.youtube.com/watch?v=1OfxlSG6q5Y https://www.youtube.com/watch?v=1OfxlSG6q5Y https://news.ycombinator.com/item?id=21164014 https://news.ycombinator.com/item?id=21164014 [2019, 386 points|5 years ago|232 comments]
- 1970-01-01 2y agoNo, you have the correct take. The bimetallic bond is a thermostat. The spring is an actuator.
- andrepd 2y agoHeh, I correctly guessed the channel just by reading the title :)