I started a new sheet metal drawing.
I set the thickness to 5mm in the sheet metal defaults dialog.
I then created a 5mm thick & 500mm long loft shape with a 300mm diameter & a 100mm diameter at the ends.
I also created a point in the existing sketch & turned the sketch on.
But with the Single Point method in the RIP function, it doesn't rip the face.
I also tried the Point to Point method with no success.
By using the same method, I created the rip to a cylinder with no problems.
Your helps are much appreciated.