101–110 of 115 posts
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Impressive but imho he could take it one step further and instead of concrete on the other end, he could rotate the gear in the opposite way.
When all the slack has been rotated out, it would require a tremendous amount of force to rotate that last gear in reverse. After all, the system wants to amplify the gear speed from that end.
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I'm sure it can spin a bit faster. Why can't it spin so fast that the final wheel visibly turns? Well the first wheels would melt from friction or be torn apart before then, and where are you going to get that much energy to turn them so fast? At some point there's the speed of light as a limit as well.
> At some point there's the speed of light as a limit as well. Why not put it in a dark room before starting up
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I imagine you could get several thousand RPM at least with a hand pump and a dentist's drill, if mechanical gearing is not a requirement.
I think ~100k RPM is achievable with a shirt button on a bunch of twisted strings, pulled on both ends. This was actually used to construct a cheap mechanism that needed the high g to separate some chemicals to analyse samples. I can't remember the details though.
I know that would blow the minds of some kids (and adults).
Are there any science museums that have something like this? When you look at this, you think that surely you can make that last gear spin. After all we've all spun gears, we know how they work. But it would be so counter intuitive to spin one of those gears by hand and basically see nothing happen no matter how much you spin it. I know that would blow the minds of some kids (and adults).
I would love for someone who knows more about physics to explain what effect a single rotation of the front gear actually has on the last one. Naively you would assume that every rotation of the first gear rotates the last by one googolth. But (I assume) that can't be true in the real world, since that distance is significantly smaller than a planck length. I have some educated guesses as to how the rotation is actua…
There's slop in between the teeth of the gears, they aren't perfectly tightly meshed. All of the gears can wiggle back and fourth that amount, but the "wiggle room" of the last gear gets shifted one googlth of a rotation per one rotation of the first gear. If all of the gears were pre-loaded, such that the slop was "behind" the contacting teeth, then the last gear would turn one googlth of a rotation, with an incompr…
Earlier quoted context omitted.
I think ~100k RPM is achievable with a shirt button on a bunch of twisted strings, pulled on both ends. This was actually used to construct a cheap mechanism that needed the high g to separate some chemicals to analyse samples. I can't remember the details though.
125k RPM. For malaria detection using a whirling paper centrifuge, powered entirely by hand. https://news.stanford.edu/2017/01/10/whirligig-toy-bioengine...
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Impressive but imho he could take it one step further and instead of concrete on the other end, he could rotate the gear in the opposite way.
It would take more energy than the total energy of the known universe to turn the last gear.
Earlier quoted context omitted.
There's slop in between the teeth of the gears, they aren't perfectly tightly meshed. All of the gears can wiggle back and fourth that amount, but the "wiggle room" of the last gear gets shifted one googlth of a rotation per one rotation of the first gear. If all of the gears were pre-loaded, such that the slop was "behind" the contacting teeth, then the last gear would turn one googlth of a rotation, with an incompr…
I wanted to make a geared divider for a "micrometric" slide but the slop/room made me wonder if there was a way to know the actual precision.