[HN Gopher] 507 Mechanical Movements (1868)
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507 Mechanical Movements (1868)
Author : Naracion
Score : 144 points
Date : 2021-03-07 05:58 UTC (17 hours ago)
(HTM) web link (507movements.com)
(TXT) w3m dump (507movements.com)
| Olumde wrote:
| I once argued with a colleague that this collection is akin to
| our software patterns. They are solutions to recurring sub-
| problems and are a mark of a mature engineering discipline.
| HPsquared wrote:
| It's similar to a library of functions.
| jxub wrote:
| Sounds like a cool HTTP response code when accessing a page with
| Selenium.
| BobMackay wrote:
| If you like such things, Nguyen Duc Thang has a ridiculously
| extensive collection he has been modeling, which can be seen at
| https://www.youtube.com/user/thang010146/featured.
| fit2rule wrote:
| This is one of those sites that I try to turn into a PDF every
| time its posted ..
| mkl wrote:
| The whole thing is based on a book, which is already available
| as a PDF, among other things:
| https://archive.org/details/Mechanical_Movements_507/page/n1...
| gala8y wrote:
| Why do you need it in a pdf? To see more thumbnails quickly?
| myself248 wrote:
| Animated: https://www.youtube.com/user/thang010146
| mkl wrote:
| This is neat! It doesn't seem the same though. The coloured
| pictures on the site are animated if you click.
| PurpleFoxy wrote:
| There is a YouTube channel called "makers muse" where a guy 3D
| prints some of these. By the looks of it, most of these designs
| are kind of useless
| djmips wrote:
| You looked at one particular guy's YouTube channel where he 3D
| prints them and that was enough information for you to decide
| they were useless?
| nkozyra wrote:
| I read it as two separate notes
|
| 1. There's a guy with a yt channel that makes some of these
| (ostensibly the more useful of these 507)
|
| 2. The remainder of the 507 on this site are mostly useless
|
| Which i can understand. I'm sure there's a ton over overlap
| in functionality with varying complexity.
| chmod775 wrote:
| Just about none of them are useless. All of them were used
| somewhere. That's how they made it in the book in the first
| place.
| thrower123 wrote:
| You don't have to look around a farm yard or even a suburban
| garage too long to see a large subset of these in the wild.
| auxym wrote:
| A lot of these sorts of mechanisms have however been made
| obsolete by modern mechatronics.
|
| For example, washing machines used to have complex gear boxes
| that made that back and forth motion during washes and also
| had a second mode for high speed spin cycles. The machine I
| bought last year has a direct drive BDC motor that simply
| used electronic control to produce all the motion types. It's
| just cheaper and in most cases more reliable.
|
| My previous machined died from gearbox failure and replacing
| it was not economically viable.
| guerrilla wrote:
| In case you missed it yesterday, this goes well with
| http://animatedengines.com/
| barneygale wrote:
| http://507movements.com/mm_152.html would this not draw a circle?
| nom wrote:
| No, watch which rod passes the center when the bar is
| horizontal and vertical.
| JoeAltmaier wrote:
| #27! Amazing
| jpcooper wrote:
| Not really sure on number 7 there. Can anyone explain?
| sandfly wrote:
| It's confusing because the drawing omits a pulley attached to
| shaft "a". Shaft "b" is hollow, shaft "a" turns inside shaft
| "b". As drawn, shaft "b" will rotate and turn bevel gear "B".
| If the belt were moved to the [undrawn] pulley on shaft "a",
| bevel gear "A" will rotate, causing "C" to turn in the opposite
| direction. The topmost pulley presumably slides left or right
| to engage the different bottom pulleys.
| sircastor wrote:
| It's not clear from the picture. The belt seen is actually on
| one of three pulleys. The pulley on the left of the belt drives
| shaft b, which spins B and turns the output. Likewise, the
| puller to the rights of the belt will turn a, and therefore A.
|
| The things that are most unclear is that the shaft between b
| and B is hollow (allowing the shaft from a to A to pass
| through) and that there are three unconnected pulleys the belt
| can ride on.
| FounderBurr wrote:
| This is amazing.
| phkahler wrote:
| I'd like to see #29 used in a 3d printer. One spiral driving 3
| gears that pull the filament down through the center directly
| into the hot end. A tiny stepper should do since there is a huge
| mechanical advantage.
| sgtnoodle wrote:
| How would you tension the three gears to provide the right
| amount of pressure across variations in filament diameter?
|
| I wonder how much wear there would be in the spiral sliding
| across the gear teeth.
| phkahler wrote:
| >> How would you tension the three gears to provide the right
| amount of pressure across variations in filament diameter?
|
| Good question. The teeth should be 1/3 apart, so maybe just
| dig in if the filament is too thick?
|
| There has to be a way, it's just too bougie not to exist.
| hilbert42 wrote:
| There are several editions of _507 Mechanical Movements_
| available on the Internet Archive. I was so impressed with this
| little book that about a decade ago I downloaded the PDF and
| turned it into a properly bound book.
|
| Here's the 1871 edition on the IA:
|
| https://archive.org/details/Mechanical_Movements_507
| HPsquared wrote:
| Interesting history on this one:
|
| 39. Sun-and-planet motion. The spur-gear to the right, called the
| planet-gear, is tied to the center of the other, or sun-gear, by
| an arm which preserves a constant distance between their centers.
| This was used as a substitute for the crank in a steam engine by
| James Watt, after the use of the crank had been patented by
| another party. Each revolution of the planet-gear, which is
| rigidly attached to the connecting-rod, gives two to the sun-
| gear, which is keyed to the fly-wheel shaft.
|
| http://507movements.com/mm_039.html
| rightbyte wrote:
| Nice ... it would have been nice if the gear ratio was written
| out for the rope mechanisms.
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(page generated 2021-03-07 23:03 UTC)