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Shelling objects with spheres
erwin_1
Member Posts: 15 ✭✭
I've noticed that when shelling an object that has half spheres on its surfaces (e.g. to simulate rivets) the shell tickness can't be larger than radius of the smallest sphere. The reason seems to be that shell (and thicken also, tested that too) follows the outline of the sphere to calculate the shell as you can see in this pic. Once you enter a larger value, the inner sphere get pinched off, resulting in a error.
I expected the shell to follow the half sphere outside the object and then normal to the flat surface. Is this normal behaviour of a bug?
The test is here: https://cad.onshape.com/documents/a4c08dda6e3f38f90964d2b4/w/f85e7f78e6250516fc76d1c3/e/3c1643b50fcb011588278d6c
Erwin
I expected the shell to follow the half sphere outside the object and then normal to the flat surface. Is this normal behaviour of a bug?
The test is here: https://cad.onshape.com/documents/a4c08dda6e3f38f90964d2b4/w/f85e7f78e6250516fc76d1c3/e/3c1643b50fcb011588278d6c
Erwin
0
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NeilCooke
Moderator, Onshape Employees Posts: 5,367 
Hi @erwin_1 - this is normal behaviour. If the half spheres are representative of rivets, add them after the shell feature so they are not included.
The shell feature is offsetting the sphere which is an "analytical" surface - if you approximated the sphere using a spline you would not get the same effect.Senior Director, Technical Services, EMEAI5
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The shell feature is offsetting the sphere which is an "analytical" surface - if you approximated the sphere using a spline you would not get the same effect.