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Change a surface from revolve to a "solid"
henry_feldman
Member Posts: 126 EDU
So I revolved a part with a totally enclosed surface, which refused to revolve as anything but a surface for reasons that no error message could explain) and OS was totally happy to thicken it and it is a nice feature. So OK, next I wished to boolean a chunk out of it with a closed shape resulting, instead it is a hollow object and I end up seeing the inside of the cube (picture a closed hollow cylinder, drill a hole in the side). Is there is way to make an object solid (I know with some imported geometry there are tools, but this is OS geometry). The alternative is an error message that informed me WHY it can't revolve as a solid, but only as a surface.
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Best Answer
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NeilCooke
Moderator, Onshape Employees Posts: 5,683 
Hi @henry_feldman
If your sketch contour is shaded then it can revolve as a solid. If it is not, there may be a small gap somewhere in your sketch. Also make sure when you use the revolve command that you pick either the entire sketch (from the tree) or the shaded area. Picking the sketch entities will create a surface.
If you just want to make the revolved/thickened surface a solid, use Delete Face and select all the interior faces (before your boolean cut).
Hope this helps,
Neil.Senior Director, Technical Services, EMEAI5
Answers
If your sketch contour is shaded then it can revolve as a solid. If it is not, there may be a small gap somewhere in your sketch. Also make sure when you use the revolve command that you pick either the entire sketch (from the tree) or the shaded area. Picking the sketch entities will create a surface.
If you just want to make the revolved/thickened surface a solid, use Delete Face and select all the interior faces (before your boolean cut).
Hope this helps,
Neil.
great request, but let's not stop here.
OS please allow me to knit into a solid. And while you're at it, this time, put in an un-knit.
henry, there is no such thing as a "solid" and there are no "solid" modelers. Once a manifold reaches a state where it's totally enclosed (surfaces meeting at edges, edges meeting at vertices) and everything is "water tight", then it achieves a status called "solid". Mathematically there's no solids involved. Everythings a b-rep, boundary representation, a volume bound by surfaces. You're letting them off to easy, stick to your guns and ask for that surface to solid function.
sorry to hi-jack your post, but it's time to turn this on. We have trimmed surfaces & 3d splines. It's time to let billy have some fun. Please let me knit & un-knit.