Football/Soccer Ball

Richard_PJ

One of my students has a project based on a football ( or soccer ball as you may call it).
Is there a straight forward way to develop a football in Onshape.

mahir

A soccer ball comprises a pattern of 12 pentagons and 20 hexagons. Here are some specifications from wikipedia. The CAD isn't too difficult, but you'll need to get the angles right.

truncated icosahedron

jon_sorrells

I made a custom feature which can make some polyhedrons.
https://cad.onshape.com/documents/2c40f522f1b5a02f6ce9ce01/v/88890a276bbd7271707e659d/e/ff4f6157c94f693e713e91d3



Depending on your needs, it may just be easier to use a sphere instead of a truncated icosahedron.

mahir

Nice, @jon_sorrells

jon_sorrells

The "Sides per face" and "Faces per vertex" parameters control what type of regular polyhedron is created.  An icosahedron has 5 triangles meet at each vertex, so to make one of those, set Sides per face = 3 and Faces Per vertex = 5.  A cube has 3 squares meet at each vertex, so it would have Sides per face = 4, and Faces per vertex = 3.
The "Untruncated edge length" controls the size of the polyhedron.  This will be the length of each edge before truncation.  If the polyhedron is truncated, the edges will be less than this length.
"Truncation type" controls how the polyhedron gets truncated.  It can be Not truncated, Uniform truncated (truncated such that all the edges end up the same length), Rectified (truncated until the original edges are gone).  Or it can have a Custom truncation, which will bring up a manipulator you can drag to adjust how far it is truncated.

Does that make sense?

ilya_baran

Or was your question how to use a FeatureScript feature in general?  If that's the case, see the video here: https://www.onshape.com/featurescript#start
While this shows you how to add example features to your toolbar Jon's feature I don't think is tagged that way -- but you can open the document he linked to and click the plus sign there to add his feature to your toolbar.

mahir

A soccer ball comprises a pattern of 12 pentagons and 20 hexagons. Here are some specifications from wikipedia. The CAD isn't too difficult, but you'll need to get the angles right.

truncated icosahedron

jon_sorrells

I made a custom feature which can make some polyhedrons.
https://cad.onshape.com/documents/2c40f522f1b5a02f6ce9ce01/v/88890a276bbd7271707e659d/e/ff4f6157c94f693e713e91d3



Depending on your needs, it may just be easier to use a sphere instead of a truncated icosahedron.

mahir

Nice, @jon_sorrells

mahir

And I really like your take on how to create a variable pattern using arrays.

Richard_PJ

Thank you for your posts. The feature script is amazing. I am not familiar with it how do I use it?

jon_sorrells

The "Sides per face" and "Faces per vertex" parameters control what type of regular polyhedron is created.  An icosahedron has 5 triangles meet at each vertex, so to make one of those, set Sides per face = 3 and Faces Per vertex = 5.  A cube has 3 squares meet at each vertex, so it would have Sides per face = 4, and Faces per vertex = 3.
The "Untruncated edge length" controls the size of the polyhedron.  This will be the length of each edge before truncation.  If the polyhedron is truncated, the edges will be less than this length.
"Truncation type" controls how the polyhedron gets truncated.  It can be Not truncated, Uniform truncated (truncated such that all the edges end up the same length), Rectified (truncated until the original edges are gone).  Or it can have a Custom truncation, which will bring up a manipulator you can drag to adjust how far it is truncated.

Does that make sense?

ilya_baran

Or was your question how to use a FeatureScript feature in general?  If that's the case, see the video here: https://www.onshape.com/featurescript#start
While this shows you how to add example features to your toolbar Jon's feature I don't think is tagged that way -- but you can open the document he linked to and click the plus sign there to add his feature to your toolbar.

Richard_PJ

thank you all for your input. My student on his own produced the desired result by drawing a thin pentagon and hexagon and made an assembly although not perfect it was satisfactory for the design development