# Thread: Need a help in catia surface

1. Junior Member
Join Date
Jul 2019
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3

## Need a help in catia surface

Hello All,

Capture.JPGCapture2.JPG

Created a outer profile. How to create center axis passing through form all the profile.

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2. Moderator
Join Date
Jul 2006
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1,679
Is each profile a circle?

3. Junior Member
Join Date
Jul 2019
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3
profile is not circle. its uneven profile. Example; the contour of bone at different plane.

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4. Junior Member
Join Date
Jul 2019
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26
Circle or not - create a power copy. Fill each "circle" with Fill operation. Then plant a "Point on Surface" with the coordinates 0 - they should land more or less in the center of the circle as the circles appear to be very irregular. Then connect the points. If the spline becomes very twisted you can reduce the number of points.

Przechwytywanie.jpg

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5. Junior Member
Join Date
Jul 2019
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3
Originally Posted by Bouta
Circle or not - create a power copy. Fill each "circle" with Fill operation. Then plant a "Point on Surface" with the coordinates 0 - they should land more or less in the center of the circle as the circles appear to be very irregular. Then connect the points. If the spline becomes very twisted you can reduce the number of points.

Przechwytywanie.jpg
Thank you very much. It works !!!

6. Junior Member
Join Date
Mar 2019
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Bouta +1
Great idea, it will take a bit of time, but it will work 100% sure

7. Junior Member
Join Date
Jul 2019
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26
Originally Posted by costinruja
Alternatively, you can also make a powercopy using a point contructor formula. This approach will give you the exact center of gravity for each (irregular profile).

centerofgravity(`Geometrical Set.1\Sketch.1` )

Attachment 2269
Attachment 2270
This is a very elegant approach but I can't understand what does the "centerofgravity()" formula result in? Where do you put that formula? Do I need to pull out the X, Y and Z coordinates from the center of gravity formula accordingly? Can you put more screenshots? Thanks.

8. Junior Member
Join Date
Mar 2017
Posts
2
The idea is that you can define geometries (point, line...) as parameters and assign them a formula. The output of this so called parameter is a geometrical entity (point, center of gravity in your case).

Capture.jpg

You can see in the box for formula definition the required inputs and outputs.

Capture_2.jpg
Last edited by costinruja; August 11th, 2019 at 08:34 PM.

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