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CAD tip CAD tip # 8194:

Question CAD 
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Q - question

Unfolding a 3D sphere to 2D shapes.

A - answer To unfold any non-unfoldable 3D objects to two-dimensional shapes (sheetmetal, paper, etc.) you can use approximations. E.g. unfolding of spherical surfaces (sphere, dome) can be approximated using petals, or "orange peels":

orange, mercator

Creating of such unfolded shape for spheres of a given radius can be done in the freeware utility CADstudio SphereUnf - see www.cadstudio.cz/download

After loading, running the SphereUnf command and specifying the sphere radius you can pick the place for the unfolded shape and the number of peels for surface approximation - the minimum, 2 peels, make two circular shapes; it is recommended to use at least 8 peels.

After you cut out the peels and bond (weld) them together, you will get the approximation of the original 3D sphere.

See also a sample of such unfold - the drawing SphereUnf.dwg

The SphereUnf utility contains also the command ConeUnf for unfolding of 3D cones (incl. truncated cones).

ACAD
100% *  CAD 
6.9.2011    14766x  
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applies to: AutoCAD ·

See also:
Tip 10916:How to project unfolded flat pattern to a sketch?
Tip 10719:How to add the unfold rule name as a drawing note?
Tip 10118:How to export a DXF file with punch points from an unfold?
Tip 9692:Unfoldable spiral-helix sheet metal in Inventor.
Tip 9583:How to add a new command to AutoCAD shortcut menus?


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