Here is an image of a piping end cap, used to close an open section of pipe.
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There are various sizes for both pipe diameter (1/2" to 24" in my piping utility, but larger are available) then we have various wall thicknesses (again in my piping utility I list schedule 5 to schedule 120, but there are many more).
Let me ask how you would create a solid of this in CAD ?
How I approached this is:
first create the section profile (via lisp).
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Then revolve the profile (180deg) to create the solid,
Using version 9 I get this:
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Version 11 throw a fit, and tells me it cannot rotate an object that 'crosses' the axis of revolution, WHY?? version 9 worked just fine:)
[from memory: version 10.0 didn't work with the same issue, some of the early maintenance versions of 10.1 did work.]
However I can revolve a 'surface' using '_REVSURF' and get this:
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