Just a smol with big opinions about AFVs and data science. The onlyfans link is a rickroll.

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Cake day: October 11th, 2023

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  • Warl0k3@lemmy.worldtoLemmy Shitpost@lemmy.worldGood luck
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    1 day ago

    Generally the reason not to put knives in the dishwasher is because the mild abrasives used in some detergents, and more importantly the agitation which bonks them around, can dull the edge (and damage the coating on the racks that prevents your dishwasher from rusting, if you have one that isn’t full plastic) (also not promptly drying the knife will lead to rusting if you have carbon steel instead of cres knives).










  • To create dynamic textures in a flexible material, the researchers combined a patterning technique called electron-beam lithography, which is typically used in advanced semiconductor manufacturing, with a polymer film that swells as it absorbs water. By firing a beam of electrons at the film, they were able to adjust how much certain areas of the material would swell, creating detailed patterns that only revealed themselves when the film was wet.

    To my reading it sounds like the color change is brought about by introducing raised microstructures on the material? Which… I’m not quire sure I understand how that can work, but that’s fascinating if I’m understanding it correctly. I would have expected the shapes to be too indistinct to be useful in producing that effect.






  • Warl0k3@lemmy.worldtoLemmy Shitpost@lemmy.worldgenius
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    7 days ago

    Yeah, there’s tons of plans out there for DIY helicopters you can get from the hobby aviation community. Usually the sticking point is making the rotor blades themselves, but I’ve seen some people get off the ground with carbon-fibre laminate blades. Not sure I’d trust them personally but it does work.


  • Warl0k3@lemmy.worldtoLemmy Shitpost@lemmy.worldgenius
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    8 days ago

    Oh, I love how rabbit-holey metallurgy can get. One of my favorite topics is the processes used to cool hardened gears that have to be ground. Keeping the temperatures below a certain point so that they don’t lose the temper is surprisingly difficult even with external flood cooling (or working fully submerged), so you wind up with insane looking profile cutters that have cooling lines built into them directly.

    Also the techiques to monitor the diameter of abrasive grinding tools get wild, like monitoring the capillary pressure of the coolant spray and similarly insane feats of precision.


  • Industrial high precision lost-wax usually has a mold made from many layers, often either done in traditional monlith casting frames (big slabs of cement or plaster or casting sand or etc) or formed by dipping the parts into various cement slurries (a bit like a candle. The first few layers are generally a low-additive “print coat” made from ceramics akin to porcelain (that won’t react with the material being cast), and then for strength they’re bulked up with thick layers of stuff that usually has been bulked up with sand and recycled shells of precious castings that have been crushed down.)

    It’s a fascinating process.