Trouble adding draft to this surface along specific edges

[Anonymous]

Hi, 

I'm trying to add draft to this curved surface but I need the drafted surface to start from the edges of the filleted joints as shown in the picture.

I tried creating a plane along edge to split the face but I'm not able to select that fillet joint as an edge. I also tried adding the draft before adding the fillet but this causes issues.

Any ideas on how I can split the curved face along the filleted edges so I can draft just that portion?

[etfrench]

Create an offset plane from the side of the rectangular piece.  Use the Measure tool to determine the  X, Y, or Z distance by measuring between the ends of the fillet arc to determine the amount of the offset.  Use the offset plane as the splitting tool.

[etfrench]

Even easier would be to use the Plane at Angle tool with the end of the fillet as the base.

[Anonymous]

@etfrench My first try was to use plane at angle at that joint but I am unable to select that edge as shown below:

I'll try the offset but the fillet joint is at a slight angle due to a draft on the shaft that joins up to the curved surface so not sure how I will measure the angle of that fillet joint.

[etfrench]

Measure from end point of the arc to the other end point of the arc.  The measurement tool will show you the XYZ distances between the points.  This assumes the rectangular piece is aligned to the X, Y, or Z axis.

[Anonymous]

It's not aligned to any of the planes unfortunately but diagonally across X,Z plane. So the measure tool is showing a difference between vertex points measurements on both the X and Z axis.

[Anonymous · Accepted solution]

Ok I ended up using a 3D sketch to sketch from the vertex of the fillet joints to the top of the curve. I then used the split face tool and split the surface using these two sketch lines and then was able to add the draft.