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Ruled Surfaces Are Not Treated As Planes When They Should Be
S1mon
Member Posts: 2,957 PRO
Another interesting bug....
When you create a ruled surface which geometrically is obviously a plane, Onshape doesn't recognize it as a plane for purposes of sketching, or as a draft neutral plane. In this public document, the highlighted surfaces are created by the ruled surface feature. You can't select them as planes for anything that needs a plane. You also can't select their edges as something that needs to be a straight edge (e.g. move face rotate axis). The other two surface bodies are created with sweep and extrude. They behave as I would expect. I can sketch on their faces, use them as draft reference planes, and use the edges as an axis. Clearly in this simple case, it's possible to work around this bug, but it seems like there should be a fix for this.
When you create a ruled surface which geometrically is obviously a plane, Onshape doesn't recognize it as a plane for purposes of sketching, or as a draft neutral plane. In this public document, the highlighted surfaces are created by the ruled surface feature. You can't select them as planes for anything that needs a plane. You also can't select their edges as something that needs to be a straight edge (e.g. move face rotate axis). The other two surface bodies are created with sweep and extrude. They behave as I would expect. I can sketch on their faces, use them as draft reference planes, and use the edges as an axis. Clearly in this simple case, it's possible to work around this bug, but it seems like there should be a fix for this.
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Yes, I reported this as a bug https://onshape.zendesk.com/hc/requests/262477
I get that if the original edge is an arc at and angle or anything slightly complex it's going to need to use more complex geometry. However, if the original edge is a line, it seems like this should be simple. If the swept surfaces in this example still are recognized as planes, there's no good reason for ruled surface to be so complicated.