Hi Michael ... I followed the advice of Pilou and Bemfarmer

The most complicated part (at least for me) is the central support in the sense that when I make cuts the surface becomes irregular ... certainly due to the "wrong" curves I create to eliminate the useless portions.

I attach the 3dm

Same as above! ;)

Put a thickness to your up piece
Boolean union all
and make the same order of Fillets as shown above!

Like this you can make anything you want! ;)



and with the Transform / Flow function you can maybe make some funny volumes
if you take target surfaces / volumes adapted! ;)

Hi Tony, I've attached a result where I cleaned up some coplanar pieces to be large single planes, constructed another revolve to give it thickness, and used Edit > Trim to cut pieces and then Edit > Join to glue it together into a solid.

Is this going in the right direction for what you need?

Then for the center area see what Pilou is doing above - you would probably want to build a separate solid for that, then boolean union with this one and then fillet edges like Pilou shows above.

- Michael

Yes Michael is the effect I wanted .... the only thing that I am not good at is drawing a line to make the sides homogeneous for a fillet .... in the sense that if I draw a rigid line it gives me acute angles. ... I don't understand how but above all where to draw a line to avoid sharp cuts on the model.

If you see the original model it has a sort of 45 ° bevel on the sides ... that's what I can't achieve .... the rest is good or bad :)

General advice : why put thickness on general form before any operations ?

Because all will be very more difficult after for any drilling, Trimming, Flow etc...

Hi Tony, for that I'm thinking maybe building the full extended shape like this:



Then the projection of the 45 degree line onto that will look like this:




So maybe adding in some additional cutters from a side profile:





Is that looking like it's closer?

- Michael

You can make also more brutal boolean Diff ;)
Like this you draw any form of curve from Top view!
Here a simple Arc curvature but anything can be drawn!
As you see i make a little rotation (or any move) for any position you want...

Yes, much better Michael ..... I didn't understand well ... but after the projections how do you cut the model at the height of the round part?

Thanks Pilou .... I can't see the video well :(

Curious! You should...but another format maybe :)

Hi Tony, so the problem is that with the projections happening from 2 different directions it will still yield a sharp area like this:



To avoid that sharp edge there it could be good to form a smooth path by putting in a blend curve, and then since the blend curve is not directly on the surface you would need to form a parting surface by something like a sweep:







- Michael

Pilou if I understood correctly in this way?

I am attaching the 3dm

I understand Michael :)

<< how do you cut the model at the height of the round part?

You can always cut anything by a simple curve, a surface, a volume...
By Trim if you don't want keep the object closed, by a boolean Diff if you want keep the object closed!

Perfect you progress to the final !

For the Boolean Diff or Union between 2 objects (or more) don't hesitate to have "true intersections" and not a simple "contact surface"!

Hi Tony, I've attached a version using the method of putting in a blend curve to make a smooth path and then forming a cutting surface.

Once you put in the blend curve, then the curves are not all on the surfaces anymore and they are not planar either so they can't cut by projection well either.

But by forming an extended parting surface then the parting surface can be intersected. So in the attached versions the parting surfaces are these pieces, see how they extend out a little ways so they can cut the main body surfaces, this is a method that you can use when the shape bends around in such a manner that there is not a single 2D view that can be used to form all the cutting profiles.

So instead of 2D profiles you use a 3D surface as the cutting object. You can use 2D profiles and project them to form most of the curves to work with though.






- Michael

Thank you so much Michael :)

Or I guess if the Top profile curve was longer it could go like this. You have to build an extruded surface for the cutting object instead of just using the curve because you don't want to cut all the way through:











Then Chamfer:



- Michael

3DM file for the last one above.

I hope I succeeded .... what do you think? .... obviously the two sides now I have joined them in one piece .... in what I am attaching they are divided and then joined .... now I have made a single piece as suggested by Michael and Pilou