is there a way to pin comments like this up top? I've just spent 5min doing the same by hand, before scrolling all the way down to see this one
583 karma · joined November 23, 2021
2024, 253 comments: https://news.ycombinator.com/item?id=40103590
2022, 271 comments: https://news.ycombinator.com/item?id=32035054
2020, 298 comments: https://news.ycombinator.com/item?id=25136422
Bosch used to do the first magnetos / dynamos in the early 1900s motorbikes / cars. The principle is similar to this day - one rotating magnetic field within one static. You can do all kinds of shenanigans and combinations of permanent magnets / coils where it's either the electric current generating a magnetic field or the magnetic field generating an electric current. Depending whether You want the movement to generate electricity or the electricity to generate movement.
In the first magnetos (the thing that uses the engine rotation in order to generate a current that then makes a spark in the spark plug) they used permanently magnetized exterior plating and a rotating winding. That's sort of what You see in the logo - two coil windings rotating in their housing.
I see the point of it being a potential e-waste in 10 years, but I'm not sure the mechanical route was much better in that respect (looking at you, shimano shifter-derailleur-brake compatibility table that currently runs a few pages long even before adding all the Di2 stuff)
BTW - "what" do You need a 48-spoke hub for? Are You building cargo bikes in Your spare time? I'm not trying to be snarky - the "all our bikes load limit is 120kg bicycle included" has long been bothering me as well (100kg rider), so... kinda curious about Your side projects
There's plenty of hacking that can be done on the subject of sewing and I admit that laser cutter is a cool one.
I'm still pretty partial to that sewing machine route (or needle and thread, if handiwork is prefferable). Simply because it lets you quickly iterate and build the taste, preferences and heuristic of how to get there. Personally, I still can't read a pattern propetly. But I'm more than happy to put a few pins into a shirt and prototype in front of a mirror.
Also, it gives me a good estimate of what I'm OK doing myself and what I will outsource to an actual tailor because it's either beyond my level, or I simply don't have time to do it.
For some basic jerseys (think T-shirts) a basic zigzag is fine to begin with. That 100EUR sewing machine will have some fancier stretch stitch options that are slow, but "good enough" to look like an overlock (but can't do the cut of course).
If you have the space / money, overlock is definitely what I'd get as a second / third machine. It's much quicker / cleaner if you're working on jerseys or shirts.
But I still keep wearing the T-shirts I did when I was starting. On my list the first thing to do is to understand how to alter something to fit you. It can be done by hand (needle and thread), but to be reasonably efficient, the BOM would be "sewing machine, box of pins, scissors, piece of chalk / ruler and something to press / iron".
Finding a tailor that understands you / you agree with is an option too, if time is a hard limit (though I'm not sure it's altogrther that much quicker).
In my case, I started with tailors, but kept running into small misunderstandings. Also, my taste keeps evolving.
Start small with simple stuff, ideally old / second hand cheap clothes. Shirts, T-Shirts and bodice waistlines / "darts" are almost trivial once you can follow a straight line. First one will take a while, second will be much quicker, by third / fourth it's almost a routine and you can start iterating on your own preferences. They likely "will" evolve as you keep wearing the altered clothes.
Depending on how much help you can get in the beginning, with maybe a 2-3h intro on how to use a sewing machine done by a friend who has sewing as a hobby, I'm pretty sure most people should be able to get their first alterations done within 4-5h. By second or third attempt, this time should be down to around 1h per item, including some setup (pinning - trying - ironing). At that point the DIY option is probably quicker than going to a tailor.
-Some Desperate Glory (Emily Tesh)
-A Memory called Empire (Arkady Martin) both of these are a fairly interesting take on scifi worldbuilding. Could be called "highbrow", but IMO pretty easy reads still.
-Piranesi (S. Clark) - well written fantasy and plenty of other stuff that I've seen in other comments (Dungeon Crawler Carl does stand out a bit, but it's really a guilty pleasure / escape kind of a read).
Non-Fiction
-Brakneck (Dan Wang) - slightly outdated (by ~2y, which seems really breakneck), but still interesting take on modern China
-Capitalism (Sven Beckert) - still halfway through this one, but it's shaping up to be my #1 for 2025 non fiction
-The Origins of Efficiency - from B. Potter, the author of Construction Physics blog. The blog is fairly information dense, but this basically reads like a textbook. Still a pretty good reference IMO for people working in manufacturing.
Both the 60Hz frequency and 940nm wavelength are fairly specific. There's a whole world of different wavelengths (1550nm is fairly common) and frequencies (up to 1MHz isn't particularly exceptional).
There's been a whole thread on the topic here:
Whatever uses that storage usually runs in a Docker inside an LXC container.
If I need something more isolated (think public facing cloudflare) - that's a separate docker in another network routed through another OPNSense VM.
Desktop - VM where I passed down a whole GPU and a USB hub.
Best part - it all runs on a fairly low power HW (<20W idle NAS plus whatever the harddrives take - generally ~5W / HDD).
Second part of the comment I omitted is was what You mentioned in the beginning. Those 20-30 meters of practical range is why we keep seeing small LIDAR sensors on things like iPhones / iPads (though there I believe the range is even a bit shorter due to the size / power constraints), but not really much beyond that.
For practical demo of what's currently available at the high end of solid state LIDAR (albeit at 40k+ USD), I'd suggest looking at Leica and their BLK2GO PULSE (solid state) vs the rest of the BLK line (rotating laser spot).
The only reason I can see is "I have one that I don't use". Because otherwise...
Idle power isn't all that much better than a low power Intel N100 or something similar. And it's all downhill from there. Network transfer speeds and disk transfers will all be kneecapped by the (lack of) available PCIe lanes. Available RAM or CPU speeds are even worse...
There's one feature they all miss. They only measure relative velocity to You. That's definitely better than nothing, but in my experience the most dangerous drivers aren't necessarily the fastest ones, but those who pass too closely. So, something like "angle of approach" measurement would be a feature I'd personally be willing to switch my Varia for something else.
The way they play with "Designed Works" and "commercial use" is really pretty weird. I kinda understand the aim - it's just one guy who's probably trying to make a startup out of this and is kinda hedging his bases against someone coming up with an injection moulded copy on Aliexpress. But the way "commercial use" is left vague is pretty sketchy. Is e.g. "background of an office in a youtube video" considered "commercial use"?
That being said, I guess I'll still finish at least one wall with it. I've used a few pegboards over the years and in my experience, these things don't die on licensing. They die on the fact that the manufacturer stops making them / switches to a different size / type. Here I can at least save the STLs and reprint the stuff as needed.
My introduction to Discworld happened when I bought a few second hand paperbacks on Portobello for under a pound in order to have something to read in the bus back from London. Later (well and truly addicted) I wenth through a few more when I was commuting regularly by train. But about a half of the Discworld novels I read as ebooks either on a Kindle, or a Kobo.
It has always been "frustrating" to have to click through the footnote links in Pratchetts ebooks. In a paper book (just like in Your comment) the footnotes really complete the train of thought. Often it's the whole pun of a joke. You know it's there. You damn well know it's worth it. On paper, all it takes is a glance down.
For me, the "Pratchett footnote" is therefore characterized as anything where "click to see a footnote" somehow breaks that payoff spell a bit.