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Cake day: June 30th, 2023

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  • Wogi@lemmy.worldtoxkcd@lemmy.worldxkcd #3047: Rotary Tool
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    6 months ago

    I occasionally run a lathe at work. The big CNC one says it will do 10,000 rpm

    If you ever run it that fast, the jaws will start to separate and the part will come flying out at Mach 4, bounce around the inside of the machine for several minutes, destroying the chuck, all the tooling, and the chip conveyor in the process.

    Another fun fact, these machines go from 5000 rpm (the fastest you’re assuredly safe to run it) to 10 at the snap of a finger and back up again. All of that energy has to go somewhere. So there’s a heat coil, pretty much identical to the one in your oven, that takes all that extra energy. It doesn’t normally get all that hot, but if you’re running a lot of parts with a lot of diameter changes, it can get hot enough to glow.









  • I have something similar for my Subaru but it’s only 4 dollars a month.

    It’s a fee I gladly pay to be able to start my car and set the interior climate from my phone. I imagine there’s some cost the access a network to have that functionality and I don’t see a problem paying for it.

    The old style that started from a key fob required you to be a lot closer to the vehicle to start it. Right now I start it a few minutes before I leave my building a quarter of a mile away. I could start it from a different country if I wanted to. Needing to be within a few hundred feet would be pretty useless to me.