Hey, so im trying to create this sketch on the surface, but the lines keep coming up red, and i cant get the vertical line to coincide with the bottom edge. any help would be much appreciated.

cheers

Luke Brient

Hey, so im trying to create this sketch on the surface, but the lines keep coming up red, and i cant get the vertical line to coincide with the bottom edge. any help would be much appreciated.

cheers

Luke Brient

I believe the answer is obvious: very sophisticated math must be involved to handle this case.

The work around to simplify the model as Thomas Voetmann suggested looks to me as the best solution.

I have similar experience with Spline on Surface. But I found I almost never need them.

Instead I create (or find) a plane close to tangent to the surface. I make my sketch with splines, fillets etc. and use either Split-Line or Project Curve.

Remember "fillets" on a curved surface are not an entity with constant radius anyway, and the splines are more easy to manipulate in the 2D-sketch environment. One disadvantage is that you dont get immediate response when you make changes.

Luke,

I can't give you an answer on why, I get the same result but a couple of suggestions.

One is to create a plane and add a relation of On Plane

The other is to use the Offset on Surface sketch tool