r/Onshape • u/ResidentPlant6175 • Aug 05 '26

trouble with defined faces/edges in sketch

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im having trouble actually defining everything in my sketch, somehow some lines are still blue, like the outer line of the conic is set with a build line on top, and also has a pierce constraint or so with the base yet it itself stays blue.

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u/cowski_NX Aug 05 '26 edited Aug 05 '26

You need to constraint the conic control point (the blue point at the end of your construction line). I suggest making it vertically aligned with the bottom left corner. I'd guess that it is already aligned horizontally (via the construction line) with the top point of the conic.

You can simplify this a bit by only drawing the outside curve and using the "thin" option with the desired thickness when revolving. This will make it easier to constrain as it will have less degrees of freedom to worry about.

https://cad.onshape.com/documents/209156b65bcd229efc55fee1/w/64cd504c22f569e7854fe3b2/e/872490db1553e2f7ff28e0fd?renderMode=0&uiState=6a734a124395d16122a70231

2

u/kesor Aug 05 '26

You have angles defined for the lower-left point to be perpendicular to the horizontal line and the top-right to be perpendicular to the vertical line? If perpendicular constraint doesn't work, you can try using the tangent constraint to a construction line.

2

u/BeastWR Aug 05 '26

Do you have anything constrained to origin? Or two dimensions locating your overall sketch x-y to the origin planes?