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winchman
12-21-2010, 12:56 PM
Some of the long-time members here may remember the hexasphericons I made a while back. They are single surface solids with a continuous flat side winding around them, and look like this:

http://img.photobucket.com/albums/1003/winchman/Hexasphericon/Hexasphericon_3.jpg

They're made by joining to pieces into a blank with pin between them. The blank is machined into a cylinder with conical ends. The length of the cylindrical center section is the same as the slant height of the cones, and the cones are sloped at 60 degrees. After the blank is finished, the two halves are rotated 60 degrees to get the final configuration.

Well, I finally got a video camera function with my early Christmas present Cannon camera, and I wanted to post a video of the hexasphericon rolling down an slight incline. (Click on the picture below)

http://img.photobucket.com/albums/1003/winchman/Hexasphericon/th_MVI_0005.jpg (http://smg.photobucket.com/albums/1003/winchman/Hexasphericon/?action=view&current=MVI_0005.mp4)

macona
12-21-2010, 01:02 PM
My head hurts now.

Me want.

BTW, Canon has one "n".

BillTodd
12-21-2010, 01:04 PM
Oh no!

Another thing I'll have to make :)


Bill

lazlo
12-21-2010, 01:05 PM
Wow, very cool!

Did you have a build thread on this?

mochinist
12-21-2010, 01:24 PM
I made one too after seeing that thread years ago, I show it to a lot of people and only one was able to guess how it was made.:p

http://img.photobucket.com/albums/v471/mochinist/sphericon002Medium.jpg
http://img.photobucket.com/albums/v471/mochinist/sphericon001Medium.jpg

winchman
12-21-2010, 01:40 PM
The machining steps are here (2 through 18):

http://smg.photobucket.com/albums/1003/winchman/Hexasphericon%202/?action=view&current=000_0157.JPG#!oZZ2QQcurrentZZhttp%3A%2F%2F smg.photobucket.com%2Falbums%2F1003%2Fwinchman%2FH exasphericon%25202%2F%3Faction%3Dview%26current%3D 000_0147.JPG

This one had a hollow center, which isn't really necessary and requires a bit more machining. You'll also have to do some calculating to avoid a breakthrough.

mochinist, seeing that just made my day. Thanks for posting the pics.

GadgetBuilder
12-21-2010, 02:22 PM
More info:

http://www.mathias.org/steve/sphericons/related.htm

http://www.pjroberts.com/sphericon/

Weird shape, hard to visualize until the dimensions along the split line are given.

John