[HN Gopher] The Octo-Bouncer
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The Octo-Bouncer
Author : spchampion2
Score : 224 points
Date : 2020-03-08 14:29 UTC (8 hours ago)
(HTM) web link (electrondust.com)
(TXT) w3m dump (electrondust.com)
| ximeng wrote:
| Five ball juggling robot:
| https://www.youtube.com/watch?v=9asDO_1A27U
|
| Three ball juggling / devil stick robot:
| https://www.youtube.com/watch?v=pKJEbs64Y2o
|
| Partner juggling: https://www.youtube.com/watch?v=83eGcht7IiI
| jcims wrote:
| High speed rock paper scissors champ -
| https://youtu.be/3nxjjztQKtY
|
| Ishikawa Komuro Labs had a bunch of crazy high speed robotic
| vision and actuation system ~10 years ago.
| https://youtu.be/-KxjVlaLBmk?t=65 if you watch the slow motion
| there's so much backlash in the system it's hard to believe it
| works at all, but somehow they factor all of that in. Crazy
| stuff.
|
| That said, for a little side project this is very cool. The
| simulation idea is dope and the end result is fun to watch.
| rkagerer wrote:
| This is amazing! But based on the title I thought it would juggle
| 8 balls.
| donquichotte wrote:
| "I basically ran my Benbox CNC 1310 (almost) nonstop for multiple
| weeks."
|
| Wow. That's some serious dedication. What an excellent multi-
| disciplinary project, congratulations!
| gpm wrote:
| Mechanically this seems like something that could also be built
| out of lego (technic). Instead working with metal it seems like
| everything needs to be custom machined.
|
| Is there a reason there aren't similar kits of metal components
| with regularly drilled holes and so on that can just be put
| together in whatever way one chooses?
| schwap wrote:
| It exists! https://en.m.wikipedia.org/wiki/Meccano
| charrington wrote:
| https://www.servocity.com/actobotics
| SubiculumCode wrote:
| This needs to be an exhibit at the San Fran Exploratorium.
|
| https://www.exploratorium.edu/
| sitkack wrote:
| Build one these but using something like micro mirrors [1], esp
| in microgravity this could be used for mass transfer and sorting
| of fine powders. The powders could be parked in clumps in an
| electroacoustic grid potential (ultrasonic phased array).
|
| [1] https://en.wikipedia.org/wiki/Digital_micromirror_device
| cdaringe wrote:
| 10/10 great work
| jv22222 wrote:
| That is awesome work and an awesome article. If that was a
| commercially available product for sale I would buy it, because,
| fun!
| philipkiely wrote:
| This article is really cool structurally, beyond the content
| itself. What I mean is that it's formatted somewhat like a
| programming tutorial (build X with Y in Z minutes) except that
| it's perfectly readable to people like me with very little
| hardware background. Most of the specific implementation details
| are abstracted out into links. I think that this kind of writing
| can be very effective for technical people trying to reach a
| broader but still technical audience.
|
| Regarding the content itself, I think it's really cool that the
| author made a sound-absorbing box for the CNC machine, and I'm
| surprised that it is safe to totally enclose the machine like
| that. After spending last summer working at a 3D printing company
| that makes metal printers, I wonder how a 3D printer would
| compare to the CNC mill in terms of time to create that many
| small parts, I imagine it would only take one print-wash-sinter
| cycle, under 48 hours, about 1/4 of the article's reported
| machine time. That said the CNC mill used was very small.
| heisenzombie wrote:
| The 3D printers you were using probably cost in the $100k-250k
| range. I think you can get tiny bench-top mills like that for
| something like $200.
| marcinzm wrote:
| And a CNC mill at a fraction of that $100k price point would
| probably be much more than 4x faster (due to spindle power
| and liquid cooling of the parts).
|
| edit: Also since it looks like 2d work you can also use a
| fiber laser to cut it out which would probably be faster and
| less messy than a CNC but more expensive of a machine.
| the_cat_kittles wrote:
| id be curious to know more about the planetary reducers. did you
| just need more precision? or torque? seems like servo motors
| would solve the second issue.
| scary-size wrote:
| Video of the machine and Windows app:
| https://youtu.be/lYyAMDYzJQM
| tantalor wrote:
| Why "Octo"?
| p1mrx wrote:
| There are only 4 motors, so it's probably named after the
| octagon-shaped opening in the frame.
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