Grasshopper

algorithmic modeling for Rhino

Hi Daniel, 

i'm trying to simulate a hypo-cycloid with the gear simulator component, but i can't figure out how to use it, what i'm trying to reproduce are the curves like the picture

 

http://www2.mat.dtu.dk/people/J.Gravesen/MoineauPump/Hypo3_2.html

def: https://www.dropbox.com/s/ou5w082wezuhylt/20140930%20Hypo.gh?dl=0

any help will be welcome

Thanks!

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Here's a rough example of how to set this up.

Note how the outer ring has a slit so it can be identified as a single shape with an inside and outside.

Also, this is a very hastily drawn gear tooth profile with massive backlash!

If you have just 2 smooth circles (like in the first row of images in your link) they will slide against each other instead of turning, but I think you could directly simulate things like in the second row without adding teeth.

Also - there was a very nice post by John Baez on these shapes:

http://johncarlosbaez.wordpress.com/2013/12/03/rolling-hypocycloids/ 

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Hello

this is a version without gears.

cheers

alex

Thanks for your help!

it was very helpfull ;-)

Regards!

Hi Daniel, 

rhino crashes every time i try to open spirograph.gh, please, can you uploaded again, 

Thanks!

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