Issue with Creating Rib on outside of a part

tim_gornet

I need to make a very complex set of ribs on the outside of the part. I created a midplane on the part and then did a intersection of the plane and external surfaces to get my geometry. OnShape doesn't allow me to create a rib projecting outward normal from the part. I then offset my geometry and tried to create the rib but it won't create the rib from the geometry for the entire curve. The normals appear to be flipped on two of the segments. Any thoughts? 

tim_gornet

Update.... If I deselect the two lines in which the normal is incorrect and create that Rib Feature and then come back with a second Rib Feature and pick the two lines that did not work I do get the rib to work around the part.