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Truncated Icosahedron or a Soccer Ball

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Project by H_Stevens posted 04-14-2018 09:40 AM 1564 views 5 times favorited 9 comments Add to Favorites Watch
Truncated Icosahedron or a Soccer Ball
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This is a Truncated Icosahedron or a Soccer Ball or a Carbon 60 atom, take your pick. It is made by joining 12 pentagons and 20 hexagons. The pentagons are mitered at 18.6887 deg. The Hexagons have alternating miters of 18.6867 and 20.9052 deg. Where a Pentagon is adjacent to a Hexagon the miters match, 18.6867 deg. on each side. Where a hexagons are adjacent to another hexagon the miter likewise match at 20.9052 deg.

This is a difficult object to build because the miters on the hexagons alternate. That is difficult to do and keep all the edge lengths exactly the same, or within a tolerance of +/- .005. When building these objects errors are additive.

The wood is Padauk, Maple and Walnut.

Hamp Stevens

-- Hamp, St. Simons Island, GA http://hampstevens.com/





9 comments so far

View Redoak49's profile

Redoak49

3242 posts in 1986 days


#1 posted 04-14-2018 11:02 AM

Beautiful…...

View majuvla's profile

majuvla

12281 posts in 2864 days


#2 posted 04-14-2018 11:52 AM

Incredible project! My such project was dissaster! Awesome wood combination.

-- Ivan, Croatia, Wooddicted

View dbeck's profile

dbeck

63 posts in 356 days


#3 posted 04-14-2018 12:34 PM

Amazing, i wouldnt evan know where to begin.

View bushmaster's profile

bushmaster

3067 posts in 2279 days


#4 posted 04-14-2018 01:20 PM

With those dimensions, my hat is off to you and I stand in awe

-- Brian - Hazelton, British Columbia

View Kayvon's profile

Kayvon

87 posts in 2303 days


#5 posted 04-14-2018 02:03 PM

This is fantastic. Do you have video of the build? I get the angles, although my equipment isn’t capable of such accuracy. I get the stapler to clamp the pieces but I need to see it. I don’t know if everyone gets how accurate this has to be. If any single component is off by a fraction it won’t work. I’m very impressed.

-- Kayvon

View H_Stevens's profile

H_Stevens

13 posts in 42 days


#6 posted 04-14-2018 03:37 PM

They way you set miters on a table saw to this kind of precision is simple. You draw the angle you want on a block in a program like AutoCad. Then get someone with an accurate CNC router to cut out that set up block. Take the setup block and square it against a miter gauge. Then simply tilt to table saw blade into the set up block until you cannot see daylight. Wa-la..

-- Hamp, St. Simons Island, GA http://hampstevens.com/

View irtamos's profile

irtamos

268 posts in 2041 days


#7 posted 04-14-2018 06:15 PM

how much does this ball weigh?

-- irtamos, Belgium

View Dutchy's profile

Dutchy

2920 posts in 2165 days


#8 posted 04-15-2018 01:29 PM

I admire the ones which can make this.

-- https://dutchypatterns.com/

View H_Stevens's profile

H_Stevens

13 posts in 42 days


#9 posted 04-15-2018 04:01 PM

Irtamos asked what this object weights?? It is hollow and has a wall thickness of approx 5/8”. It is approx. 10” in diameter. Weight is about 3-4 pounds.

I have now posted several of these types of objects.. Using the right tricks and techniques a woodworker or wood turner of moderate skill could build one. It ain’t rocket science or brain surgery !!

Anyone who wants to build one, please contact me. Email me at hamp@hampstevens.com

Hamp

-- Hamp, St. Simons Island, GA http://hampstevens.com/

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