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I need advice how to fill the inside of this flange ,enter image description hereso the holes and ellipse to be empty.A step by step advice or a video will be helpful. Thank you.

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I'll recommend you this:

Start with a flat geometry (in your case you can delete the extruded faces):

enter image description here

Notice that I only add one circle (You should lower the circle vertices number for ease of work). In this particular case the two big figures (the big circle and the ellipse) have 32 vertices and the small one have 16 vertices.

Select 3 quarters of your geometry like this:

enter image description here

Erase the vertices

enter image description here

Then add a mirror modifier that affect the X and Y axis to get this result:

enter image description here

Now fill up the geometry the way you need it:

enter image description here

If you get this kind of effect, the darker faces (it may not happen) this is due to some normals that have been gone the wrong way, to fix this select your entire mesh by pressing A and then press Crtl + N to flip normals.

Now, get a better view angle.

enter image description here

Extrude on the Z axis, press e (extrude) and move your mouse until you get the desired results.

enter image description here

For more detailed mesh you can add two modifiers. First the Edge Modifier and then the Subsurf modifier. The order of the modifiers will impact in how your mesh looks.

enter image description here

enter image description here

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Maybe it would be easier if you did it another way (destructive version):

  • Create a circle with 3 inner circular edge loops.
  • Create your central oval, extrude it down.
  • Cut off your mesh, keep only 1/4th and give it 2 mirrors, one on the X axis, the other on the Y axis.
  • Create a hole, extrude once, and use W > LoopTools > Circle to make your hole circular.
  • Extrude down your circle.
  • Extrude up the whole mesh to give it thickness.
  • Extrude up the central hole.
  • Give some extra edge loops so the angles will be sharp when you'll add a Subdivision Surface modifier.

enter image description here

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  • $\begingroup$ questions: 1) can be the ellipse transformed to be a mother flange from it( this from workflow is father ) , because the 2 flange i must to join together? 2) can i transform the ellipse with scale after finishing ,because i need to connect it with a tube with the same ellipse end? thank you $\endgroup$ – roland78 Dec 25 '18 at 20:00
  • $\begingroup$ yes you can do what you ask: If you want to copy a part of a mesh to make a new object, just select, duplicate with shift D and use P to separate and make a new object. To transform the ellipse, select it and use S to scale, and press the axis on which you want the scale to happen, or shift+axis to exclude an axis. I don't know if it answers your questions though... $\endgroup$ – moonboots Dec 26 '18 at 8:55

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