I have been trying to model a transition from square tocircle, overal height is 6", the rectangle is 12 x 7.5", the circleis 3.25 inches and is tangent to the rectangle when viewed from thetop, tangent to the 12" side.
To complicate things there are vertical walls 3" tall around therectangular opening.
I am modeling only half of the funnel, so the sketches are an openrectangle with fillets lofting to 2 large arcs and 3 short straightlines ( equivalent to 1/2 circle) , equalling the number of linesegments in each sketch. All of my models fail because there arefeatures that cannot be unbent. If I model the circular openingwith one arc, then the flat pattern can be developed, but there areno bend lines.
If I model the circular opening as located in the center of therectangle, everything works well..SolidworksSheet Metal







To complicate things there are vertical walls 3" tall around therectangular opening.
I am modeling only half of the funnel, so the sketches are an openrectangle with fillets lofting to 2 large arcs and 3 short straightlines ( equivalent to 1/2 circle) , equalling the number of linesegments in each sketch. All of my models fail because there arefeatures that cannot be unbent. If I model the circular openingwith one arc, then the flat pattern can be developed, but there areno bend lines.
If I model the circular opening as located in the center of therectangle, everything works well..SolidworksSheet Metal