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Trouble mating curved surface

Question asked by Ryan Sadeghi on Aug 7, 2017
Latest reply on Aug 8, 2017 by Kevin Pymm

Hey everyone, I've been asked to model a plunger tangent to a countersink:

I modeled the two components and inserted them in an assembly. However, SolidWorks isn't letting me create a tangent relation between the countersink and the chamfer on the plunger. The reason (I think) is because in the assembly, SolidWorks isn't recognizing the flat bottom face and the chamfer as separate features:

Both faces get highlighted when I select just the chamfer. The strange thing is that when I edit the individual part, I'm able to select the faces separately:

So even though this is the case in the subcomponent, I wanted to emphasize the fact that I want two separate faces by using the split line feature. I spent about an hour trying to figure out why there were errors today at my internship, but when I tried it at home just now (doing nothing differently), it worked...

Anyway this is what it looks like:

When I jumped back into the assembly though, I ran into the same problem. Is there something about the assembly that doesn't allow me to mate two curved surfaces or is there an easier way to go about doing this? Worst case, I could calculate the tangent point and create a plane at that location and mate it there, but that seems like it would be a pain.