5 ms·

Make Your Own Pythagorean Cup

nielsbot 8y ago
Putting the tube in the handle seems like a great design! Has anyone hit on that before? (Happy New Year everyone)
- tobr 8y ago
  It’s a clever way to hide it. But wouldn’t it be better to just let it loop around the handle, like this? [1] 1: Excuse the crappy drawing, https://i.postimg.cc/FR7Qc9M5/0845194-D-F5-DE-46-D6-8200-CB9-F8-ABDA332.jpg https://i.postimg.cc/FR7Qc9M5/0845194-D-F5-DE-46-D6-8200-CB9...
  - nielsbot 8y ago
    oh yeah... that’s good too
- semiagnostic 8y ago
  Isn't that how toilets work?
  - grzm 8y ago
    From the article: > "The pipe acts as a siphon much as the plumbing does in a modern toilet."
    - semiagnostic 8y ago
      Oh yes, I missed that.
heyjudy 8y ago
Nice. Two phase flow is a difficult subject, so much so the owner of a nuclear engineering consultancy I worked for wrote his magnum opus on it: Two-Phase Flow in Complex Systems It's imperative to get right in process environments like chemical production facilities and nuclear reactors. https://www.wiley.com/WileyCDA/WileyTitle/productCd-0471329673.html https://www.wiley.com/WileyCDA/WileyTitle/productCd-04713296...
- jonsen 8y ago
  How is this relevant? Pouring liquid into a Pythagorean cup does not lead to two-phase flow?!
  - bmsleight_ 8y ago
    Relevant, by only being link spam.
walrus01 8y ago
You can also 3d print one: https://www.youtube.com/watch?v=sJV1R802ZBk https://www.youtube.com/watch?v=sJV1R802ZBk https://www.thingiverse.com/thing:123252 https://www.thingiverse.com/thing:123252 https://www.yeggi.com/q/pythagorean+cup/ https://www.yeggi.com/q/pythagorean+cup/
jstanley 8y ago
I just modelled a 3d-printable version of the "tube hidden inside handle" design: http://incoherency.co.uk/interest/pythagoreancup.stl http://incoherency.co.uk/interest/pythagoreancup.stl It's not printed yet, but apart from the excessive overhang at the top of the handle I think it will work. Side view at 50% opacity: https://img.jes.xxx/2003 https://img.jes.xxx/2003
- abcd_f 8y ago
  The problem with this design is that you can only drink from the cup with the handle facing away from you.
  - jonsen 8y ago
    The handle at a right angle but no closer is okay.
    - jstanley 8y ago
      I think it can be slightly closer to you than that. The cup is wider at the top than the bottom, which means when you tilt it over you are removing some liquid from a narrow part of the cup and adding an equal volume of liquid to a wide part of the cup. That means the level drops slightly.
- mrfusion 8y ago
  I’d make sure the tube is pretty wide. I made one and it wasn’t very impressive to wait 30 seconds while the water trickled out. Just seems like a leaky cup. I’d go more for a toilet flush type of thing if I redid it.
  - jstanley 8y ago
    You're right :) It finished printing and works as it should, but it takes an extremely long time to drain. tobr suggested an alternative design elsewhere in this thread: https://i.postimg.cc/FR7Qc9M5/0845194-D-F5-DE-46-D6-8200-CB9-F8-ABDA332.jpg https://i.postimg.cc/FR7Qc9M5/0845194-D-F5-DE-46-D6-8200-CB9... - I think it would be easier to conceal a larger tube within that, so I might have to try that too.
based2 8y ago
https://en.wikipedia.org/wiki/Hero_of_Alexandria https://en.wikipedia.org/wiki/Hero_of_Alexandria https://en.wikipedia.org/wiki/Heron%27s_fountain https://en.wikipedia.org/wiki/Heron%27s_fountain
szemet 8y ago
I have one. In my washing machine (LG) rinsing slot... I know, because I always have to be very careful not to overfill it. But usually there is some leftower water in its pipe so it does not keep the fluid even if I not overfill - so nowadays I routinely take it apart and shake it dry before each washing - clever but not to convenient...
klyrs 8y ago
My grandpa had a similar contraption; a "puzzle jug" -- he'd fill it with wine, drink some, and pass it around to his guests -- who would often tip the jug and spill. Amusingly, potheads are more likely to succeed than the general population, because it's just a carburetor. https://en.m.wikipedia.org/wiki/Puzzle_jug https://en.m.wikipedia.org/wiki/Puzzle_jug

Putting the tube in the handle seems like a great design! Has anyone hit on that before? (Happy New Year everyone)

tobr 8y ago
It’s a clever way to hide it. But wouldn’t it be better to just let it loop around the handle, like this? [1] 1: Excuse the crappy drawing, https://i.postimg.cc/FR7Qc9M5/0845194-D-F5-DE-46-D6-8200-CB9-F8-ABDA332.jpg https://i.postimg.cc/FR7Qc9M5/0845194-D-F5-DE-46-D6-8200-CB9...
- nielsbot 8y ago
  oh yeah... that’s good too
semiagnostic 8y ago
Isn't that how toilets work?
- grzm 8y ago
  From the article: > "The pipe acts as a siphon much as the plumbing does in a modern toilet."
  - semiagnostic 8y ago
    Oh yes, I missed that.

Nice. Two phase flow is a difficult subject, so much so the owner of a nuclear engineering consultancy I worked for wrote his magnum opus on it: Two-Phase Flow in Complex Systems It's imperative to get right in process environments like chemical production facilities and nuclear reactors. https://www.wiley.com/WileyCDA/WileyTitle/productCd-0471329673.html https://www.wiley.com/WileyCDA/WileyTitle/productCd-04713296...

jonsen 8y ago
How is this relevant? Pouring liquid into a Pythagorean cup does not lead to two-phase flow?!
- bmsleight_ 8y ago
  Relevant, by only being link spam.

walrus01 8y ago

You can also 3d print one: https://www.youtube.com/watch?v=sJV1R802ZBk https://www.youtube.com/watch?v=sJV1R802ZBk https://www.thingiverse.com/thing:123252 https://www.thingiverse.com/thing:123252 https://www.yeggi.com/q/pythagorean+cup/ https://www.yeggi.com/q/pythagorean+cup/

jstanley 8y ago

I just modelled a 3d-printable version of the "tube hidden inside handle" design: http://incoherency.co.uk/interest/pythagoreancup.stl http://incoherency.co.uk/interest/pythagoreancup.stl It's not printed yet, but apart from the excessive overhang at the top of the handle I think it will work. Side view at 50% opacity: https://img.jes.xxx/2003 https://img.jes.xxx/2003

abcd_f 8y ago
The problem with this design is that you can only drink from the cup with the handle facing away from you.
- jonsen 8y ago
  The handle at a right angle but no closer is okay.
  - jstanley 8y ago
    I think it can be slightly closer to you than that. The cup is wider at the top than the bottom, which means when you tilt it over you are removing some liquid from a narrow part of the cup and adding an equal volume of liquid to a wide part of the cup. That means the level drops slightly.
mrfusion 8y ago
I’d make sure the tube is pretty wide. I made one and it wasn’t very impressive to wait 30 seconds while the water trickled out. Just seems like a leaky cup. I’d go more for a toilet flush type of thing if I redid it.
- jstanley 8y ago
  You're right :) It finished printing and works as it should, but it takes an extremely long time to drain. tobr suggested an alternative design elsewhere in this thread: https://i.postimg.cc/FR7Qc9M5/0845194-D-F5-DE-46-D6-8200-CB9-F8-ABDA332.jpg https://i.postimg.cc/FR7Qc9M5/0845194-D-F5-DE-46-D6-8200-CB9... - I think it would be easier to conceal a larger tube within that, so I might have to try that too.

based2 8y ago

https://en.wikipedia.org/wiki/Hero_of_Alexandria https://en.wikipedia.org/wiki/Hero_of_Alexandria https://en.wikipedia.org/wiki/Heron%27s_fountain https://en.wikipedia.org/wiki/Heron%27s_fountain

szemet 8y ago

I have one. In my washing machine (LG) rinsing slot... I know, because I always have to be very careful not to overfill it. But usually there is some leftower water in its pipe so it does not keep the fluid even if I not overfill - so nowadays I routinely take it apart and shake it dry before each washing - clever but not to convenient...

klyrs 8y ago

My grandpa had a similar contraption; a "puzzle jug" -- he'd fill it with wine, drink some, and pass it around to his guests -- who would often tip the jug and spill. Amusingly, potheads are more likely to succeed than the general population, because it's just a carburetor. https://en.m.wikipedia.org/wiki/Puzzle_jug https://en.m.wikipedia.org/wiki/Puzzle_jug