monotremata

joined 2 years ago
[–] monotremata@lemmy.ca 2 points 1 week ago (1 children)

Most of the "commercial" TVs, the ones intended for businesses, don't have this. They also don't have streaming services and whatnot not built in. They're just a display with a few inputs, and maybe a tuner.

[–] monotremata@lemmy.ca 2 points 1 week ago

Haha, that's giving me way too much credit. I was a high school student and was still figuring out what the GUI bits did, like the ArcBall widget, so I practically couldn't do anything useful on the GUI itself on days when I didn't have a GUI machine. I could do some of the behind-the-scenes linear algebra stuff, though. Like, there was an array that held a 3d vector at every point in space that represented the flow field, and they wanted to be able to visualize cross-sections, so for that I needed to make a 2d grid of 2d vectors on a single plane. That sort of thing basically had to be done blind anyway.

[–] monotremata@lemmy.ca 4 points 2 weeks ago (2 children)

Oh man, I had to use the orange ones sometimes at my first programming job. They were VAX/VMS dumb terminals. It sucked getting stuck with one of those, because the job was making a visualization GUI for some data, and these ones literally couldn't run the GUI; they were text-only. Eventually they started reserving one of the GUI-capable machines for me.

[–] monotremata@lemmy.ca 2 points 2 weeks ago

I gave a quick try of meshtastic and quickly switched over to meshcore, which has a much smarter routing algorithm that makes it more useful in cities. I'm also reticulum-curious. In the medium-term I'm looking at possibly putting up a solar "roompeater," which acts as both a "room" (basically allows asynchronous chat between two client nodes that aren't always online at the same time) and a repeater (basically a router). It has some disadvantages over running the two separately, but since I want both to have power in the event of a disaster, the cost savings of doing both on one node outweighs those for me right now.

[–] monotremata@lemmy.ca 3 points 2 weeks ago

I suspect they know something we don't about a future XBox ARM handheld.

[–] monotremata@lemmy.ca 0 points 2 weeks ago

Through the modial interaction of magnetoreluctance and capacitive diractance... https://youtu.be/Ac7G7xOG2Ag

[–] monotremata@lemmy.ca 3 points 2 weeks ago (1 children)

I mean, it's talking about people thinking that "energy, frequency and vibration are just mystical nonsense." People don't think that if you talk about an FM station broadcasting on a particular frequency, or about the frequency of light absorbed by particular atomic orbitals. They think that if you're explaining that you've slept much better since you placed jasper and amethyst on the ley lines near your bed to absorb the negative frequencies.

The implication in the meme that anyone who is using these terms cannot be indulging in mystical nonsense, because these terms can also apply to real things. In fact, though, mystic cranks have been coopting scientific terms for ages, and they show no signs of slowing down. It's a real problem that people confuse crap with science.

[–] monotremata@lemmy.ca 3 points 2 weeks ago (3 children)

This is what I don't like about the top meme, though. Like, yes, energy, frequency, and vibration are all things. Obviously. But the top meme is implying that everyone should believe that those things work in the specific ways that the woo practitioners say they do, and that's a very different demand. More, it's implying that people who doubt those effects are ignoring obvious evidence, when in fact the people who doubt those effects do so because nobody has been able to demonstrate reliable evidence for them. It has a nasty gaslighting overtone to it.

[–] monotremata@lemmy.ca 7 points 3 weeks ago

Many years ago when t-mobile first debuted their "visual voicemail" that did automated transcription, my dad brought me his phone and wanted to know what the hell has happened with one of his messages. It said something like "Parrot vegan spaniel primo wavy." I showed him that he could still press a button to listen to the actual message, and it was from Walgreens; the computer had been trying to transcribe the Spanish voice saying "para diga en Espanol, oprima nueve."

[–] monotremata@lemmy.ca 1 points 3 weeks ago

Glad I could help!

74
Moire/Vernier Radius Gauge (www.printables.com)
submitted 8 months ago* (last edited 8 months ago) by monotremata@lemmy.ca to c/3dprinting@lemmy.world
 

I previously posted this on Reddit, since it reaches more people there (and I didn't want to post everywhere at once, as it makes it harder to keep up with the comments). Sorry about that.

This is a tool for measuring the radius of a circle or fillet from the outside; it uses a moire pattern of slots and lines to enable a direct reading of the values from a vernier scale.

A video of a broken-open version makes it a little easier to see how the moire and vernier features operate: https://i.imgur.com/Ku2nBkq.mp4

More photos of a slightly earlier version are here, including the tool being used for actual readings: https://imgur.com/gallery/moire-vernier-radius-gauge-design-3d-printing-ajy0GBg

I was inspired by this post: https://makerworld.com/en/models/1505553-adjustable-chamfer-gauge#profileId-1575605

which is a gauge which measures chamfers using a sliding probe. The same user had also posted a radius gauge, which worked similarly, but it was much larger, using gears and two racks in it to amplify the motion, which I didn't initially understand. I asked about it, and he pointed out that, because of the geometry of the probing, the slider only moves a small proportion of the length of the actual radius being measured--about (sqrt(2)-1), or 0.414mm per mm of radius. Since we're drawing the marks with a 0.4mm nozzle, it's not really possible to make marks that close together and still have them readable.

So I thought, I bet you could fix that with a vernier scale. And then I had several thoughts all at once--that a lot of people are kind of scared off by vernier scales, and also that I bet you could fix that with 3d printing using the relationship between moire patterns and vernier scales. I don't think I've seen this done before, but it probably wasn't really practical before 3d printing. Arguably it's not entirely practical now, as the deep slots and parallax effects can make it a little hard to actually see the markings. But it was a fun experiment, and I think the result is eye-catching enough that it's probably got some educational value in getting people to actually think about how it is that vernier scales work. (It might even have educational value for things like number theory...e.g., it's important that the vernier factor involve relatively prime numbers, in this case 9 and 10. Can you see why?)

Anyway, hope folks here find it interesting too.

 

Bear with me for a moment, because I'm not sure how to describe this problem without just describing a part I'm trying to print.

I was designing a part today, and it's basically a box; for various reasons I wanted to print it with all the sides flat on the print bed, but have bridges between the sides and the bottom to act as living hinges so it would be easy to fold into shape after it came off the bed. But when I got it into PrusaSlicer, by default, Prusa slices all bridges in a single uniform direction--which on this print meant that two of the bridges were across the shortest distance, and the other two were parallel to the gap they were supposed to span. Which, y'know, is obviously not a good way to try to bridge the gap.

I was able to manually adjust the bridge direction to fix this, but I'm kinda surprised that the slicer doesn't automatically choose paths for bridging gaps to try to make them as printable as possible. I don't remember having this issue in the past, but I haven't designed with bridges in quite a while--it's possible that I've just never noticed before, or it could be that a previous slicer (I used to use Cura) or previous version of PrusaSlicer did this differently.

Is there a term for this? Are there slicers that do a better job of it? Is there an open feature request about this?

Basically just wondering if anyone has insight into this, or any suggestions for reading on the subject.

Thanks!

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