Hi Brad, This works in WF5 and I see no reason why it won't work for WF3:
- create a sketched curve of the base of the dome (an ellipse) - create a sketched curve of a circle of known diameter (D) at the centre of your ellipse - create a variable section sweep selecting the circle as Origin and the elliptical curve as Chain 1 (Embedded image moved to file: pic15257.gif)
- Use a sketch as shown below. In my example the diameter of my circle was 10 so the dimension '5' is the radius of the circle. It ensures the dome meets in the middle (if you selected the elliptical curve as your origin you would not be able to do this - you would either have an elliptical hole in the middle or a pretty four leaf clover overlap shape. The vertical centre line on the left goes through the point on Chain 1. The curve is a conic with a rho value of "sqrt(2)-1" as a relation. According to the ProE help files for conics you will see this defines it as an ellipse. (Embedded image moved to file: pic23158.gif)
There may be an easier way to do it but I don't know how!
-- Mark von Huben
Principal Mechanical Engineer Cochlear Ltd 14 Mars Rd Lane Cove West, NSW, 2066 Australia