Expanding Circle

Expanding Circle based on Hoberman sphere.
For those who are interested in the construction:
http://www.snels-design.com/en/main/gallery/expanding_circle

Category:

Science & Technology

Tags:

• hoberman
• expanding
• circle

[tom123bbq]

how do you make sure that is 1 degree of freedom

[dpaddie]

@tom123bbq Bij constructing the parts so that all three of the joints only can move in a line that goes through the center. See my comments in the description of this video

[farferkugelis]

how do you calculate the bend angle of the pieces?

[dpaddie]

@farferkugelis I consctructed the angle of the pieces by drawing the angle of one part in two lines and a centerline. Each part has three points (the joints) that always stay on the two lines and the centerline. That is how I constructed the angles...

[JKTCGMV13]

are all sticks same length?

[dpaddie]

@JKTCGMV13 yep they are all the same length and shape

[peterargall]

An easier way to approach the angles in the pieces is the formula:

θ=180((n-2)/n)

where n is the number of rhombi (or you can think of it as half of the number of pieces) in the final "circle"

θ will be the angle in degrees that each piece should have.

Note that for this to work, there must be equal length of material on both sides of the angle in each piece.

[veinsandvines]

What did you use for the joints?

[FesterBable]

How is this a circle? Circles don't have straight edges as far as i know.

[JRENTROIA]

Como conseguir esse desenho?

[pmpmpm9]

what tipe of pin do you use to join this parts so they go their respective way?

[pmpmpm9]

can you help me to construct this? when i move one part doesnt move all parts.. what can i do? please

[katsumorymoto]

OMG NOOOO!!!! STOP ITS HYPNOTIZING ME!!!!

[BlueAquaMarina]

Pure magic!! Thank you my dear!!

[tom123bbq]

@dpaddie

thanks.

[tom123bbq]

if all joints are pin-connected they wont move in the same orientation right?

what is the trick to let them move in a similar motion?

[mitchmitch4214]

thats your mums sphincter after ive played around with it

[egert5]

sun of the 7 north temple xD

[gokharol]

AHHH!

I want one too!!

[dsavetark]

nice!

[TheFailPolice]

Poor F5. :[

[ConsoleCapture]

10k views, 3 comments i think F5 is hurting,

[Anon0Arschi]

how do you make it

[dwyllie]

Beautiful