Pattern/revolve around an elliptical, tapred surface

[lidberg.david]

Hello,

How is it possible to continnue this cut-out as a pattern around this shape? I ve tried a few things but everything ends up a big mess. Revolve applies it in a circle which it obviosuly isnt supposed to do. Sweep using one of the upper elliptical edges as a path does something else equally weird. And so on ...

Anyone please assist if possible.

EDIT// Link to f3d project file: https://ufile.io/gtd0o6o1

[mango.freund]

please give your work as a f3d file to us. thanks -- mango

[davebYYPCU]

No file for your dimensions but can be done, you didn't say how many holes.

Might help....

[davebYYPCU]

Like this one?

[KristianLaholm · Accepted solution]

Is it something like this you want?

* Revolved a slot creating a "tool body" 

* Pattern on Path using tool body and a path created on a midplane ellipse body (path must be in center of body)

* Split face using tool bodies, removed tool bodies.

* Press/pull on split faces creating cut outs.

[lidberg.david]

That is perfect! How did the inside surfaces in the cutouts end up to be 90 degrees to the curved surface if you used a tool shape at the center of the model? They ought to have been perpendicular to the base plane then no?

Anyway, tht is exactly what I was after. Thank you, and thank you to everyone else suggesteing solutions. Very appreciated!

[KristianLaholm]

The tool shapes was only used to split outside face of the body, press/pull created the cut outs.

Press/pull will follow the "normal" of the face/surface, that gives the 90 deg cut angle to the curved surface.

[lidberg.david]

Hm, a litle nitpicking / curious observation ...

The height of the tool body is constant along the path while the height of the face varies between a minimum at perihelion and a maximum at aphelion. Would it be possible to sweep a pattern that maintains a proportional height to the upper and lower edges of the face along the path?

[g-andresen]

Hi,

Very nice solution!

günther

[davebYYPCU]

My version does that, where the body protrudes has proportionate geometry, 

sounding like you want set Tangent distance from the body edge, on the external face?

That would require a different strategy, 

Is it possible to announce the slot count?

[KristianLaholm · Accepted solution]

If you want a pattern to adjust you need to pattern a Feature and use Compute option Adjust.
In this case i make the Extrude of tool body to object and then the pattern adjust length of bodies along the path.

There are problems in the workflow, I only did it to show the possibility.

[lidberg.david]

Nice! Very apprecited you taking the time with this. If I may, I ll claim some more of your time on a further iteration facet of this design.

Examining the surfaces inside the cut-outs, they _are_ done perpendicular to the face they are cut out of. However, the faces inside the cut-outs are not flat surfaces but rather minor arcs of the circumference of the tool body. How would you produce these cut-outs while at the same time produce completely flat surfaces inside the cut-outs?

[KristianLaholm]

The faces of the cut outs are normal to the outside surface using Press/Pull, they are not from the shape of the tool body.
If you by "flat faces" want them all to follow the same vector? I don't know of a workflow that easy can create that.
There can be some possibilities using manufacture but I think it will be time consuming.