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Jul 12, 2010
06:07 PM

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Jul 12, 2010
06:07 PM

Elipse

Pro E users,

How do you create a elliptical dome? Where the base of the shape is an

ellipse.

Brad

WF3

How do you create a elliptical dome? Where the base of the shape is an

ellipse.

Brad

WF3

1 REPLY 1

Jul 12, 2010
06:56 PM

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Jul 12, 2010
06:56 PM

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

p +61 2 9425 5210

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

p +61 2 9425 5210