Projecting the intersection point between two parts.

Marijn_2

The following is probably very possible, I just can't figure out how. 

I have two simple parts a cube and a cylinder. the cylinder intersects with the cube at an angle. I want to be able to obtain in a sketch on a face of the cube the ellipse where the cylinder intersects the cube. 

If i use the "Use" tool on the face of the cylinder it projects on the plane where the end of the cylinder intersects, not where the cylinder Intersects with the plain.

A simple example of the problem is here: https://cad.onshape.com/documents/dacfae8a625f4bf6997511d4/w/f50751449fe348eb86787b57/e/7a70fc77ea2f44d2958122e4

I'm not that versed in CAD software. So, please go slow.

Regards,
      Marijn. 

Narayan_K

You can split the cylindrical part at the intersection face,for that
1. Create a plane at the intersection face of cube with zero offset.
2.Split the cylindrical part with that plane.For this you can use "split" option.
3.Now you can project the required ellipse using "Use".
4.Boolean two split parts to make cylindrical part as before.

Narayan_K

andrew_troup

If you don't wish to split the part, another way to create an elliptical edge would be to project the same circular sketch you've used to extrude the cylinder, (sketches can be reused as often as you want) by extruding it as a surface, specifying (as an end condition) "up to part", and selecting the cube as the part. 
This method would still work if the face of the part was not a flat planar face.