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How to fill this surface
aaron_emerick567
Member Posts: 4 ✭
I've tried boundary surface, fill, and loft. How should I finish this surface? the guides ought to be obvious.
https://cad.onshape.com/documents/90204bbd7664dda0ffccb623/w/e74aafb81f7eed37d02e0cd5/e/97754ad9daa03477358a6f25?renderMode=0&uiState=68e0c1c4fccb3fab6bc891d0
1
Comments
If you're asking generally how to model this part that's a pretty broad question so it's tough to answer succinctly. I see quite a few challenge areas. Is there something in particular you're trying to solve? Otherwise I recommend the surfacing lessons in the learning center and after that maybe my Surfacing Deep Dive video.
https://learn.onshape.com/catalog?query=surfacing
https://youtu.be/s-Ou2zgb5Yw
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Here's a simple trick using surfacing techniques. I would use the Fill command and creatively make a spline as a guide to help shape it.
Preselect midpoints before selecting the 3D spline tool (For some reason it doesn't let you select midpoints from within the tool but you can select beforehand)
It automatically creates a spline across the 2 points, the creative part is selecting the direction for each point.
For the top point you can select that top spline you've already drawn. For the bottom I would use the rollback bar to fit a 3 point plane I'll show that next:
make a quick 3 point plane then go back to the 3D spline tool and use the plane as the direction for the bottom point.
Use the plane as the direction for the second point, as always flip the direction using the arrows to make sure it makes sense.
Use the fill command and you see you need that rounded profile instead of a straight shot.
Use that 3D curve now as a guide in the fill tool.
You can use different weights on the 3D splines to change the curvature or add more 3D splines. But this is a basic surfacing technique that might help.
https://cad.onshape.com/documents/10e46fc630270ddfa3961692/w/6b79432064749549bad90de1/e/ac8f65e3fbf3309a1d4f9133?renderMode=0&uiState=68e7ade43fb82f380a5064e9
sorry for the delayed response guys, I got pulled into a project and completely forgot about this. Any how. I did end up getting this with a fill feature using the guides shown here:
The part I was originally struggling with was that I had to break those guide lines up, which was inconvenient and IMO a senseless requirement. I used the original guides to loft the surface on the left to the boundry where the guides now terminate on the left. So the problem was that even if your guide entity is a spline which has a spline point that is coincident with the fill boundry (on both sides of the boundry), if the spline continues on past the boundry, the fill feature wont work. I had to break my splines up so that they terminate at the boundry, rather than just have spline points along them which are coincident at the 2 boundries.
I moaned and whined, then i shut up, broke 'em up, succeeded with the fill, and moved on.
Cheers! :-)
seems like overkill with that many guides unless you really need specific surface control like that.. there is a trim guides checkbox that should work if your guides run long.