What is the best way to create Dome Surface

[BHOoi]

I am currently working on a button design that requires a crown on its top surface, see pic below. The highest point is 0.30 MM, ideally from its x-sectional center of gravity. What is the best way to:

1. locate the C.G.

2. model the dome for its top surface.

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[TomD.inPDX]

Creo 2.0 attached.

0. make extrude solid

1. get CG from mass properties

2. locate CSYS with CG parameters

3. create point .03" above over CG

4. intersect desired dome curve

5. generate edge sketches (2)

6. create boundary blend and manipulate the joining points.

7. create surface from top surface

8. merge surfaces

9. solidify

Steps 7-8 made for cleaner edges.

Probably 10 more ways to do this but that's what I did.

[TomD.inPDX]

sorry, missed the 0.3mm...  Some more tweaks on this one.

[John.Pryal]

Hello, you could also consider using some old pro-e features burried deep down in the software, Radius dome & Section dome. There is a config option allow_anatomic_features which allow the use of these, but they are still hidden. You can access them by searching in the top right hand corner for commands that are not in the ribbon. They might not give you the required geometry, but they are an option all the same.

John

[BHOoi]

Thanks. I am looking at more controls so that I can have the peak placed at exact height and location. Not sure I can achieve it through those dome commands.

[BHOoi]

Love it ! BTW, do you foresee any issues with the pointy ends of the blend, shown below? Any way to get rid of those?

[Constantin]

Those 'degenerated' points might cause problems when offsetting the surface (offset, shell).
If you run a 'shaded curvature' analysis and you look closely at the points where the iso-lines fall into a point, you are likely to find, that the surface is 'wavy'.

[BHOoi]

Thanks for the info. I will check it out.

[TomD.inPDX]

Maybe use sections across the parts rather than lengthwise.

Boundary blend works pretty well with large numbers of sections.

It all depends on how much control you want.

In general, I didn't see any artifacts at those ends.

It has to do something when deciding what to connect.

Typically, you would overflow the surface and trim it off.

I don't think I'd every try to do class a surfaces on a regular basis with core Creo.

There is also freeform features.  These can be joined to existing geometry.  But these too offer little control.

Are you sure you don't need the advanced surfacing module for your work

I'm just sayin'

[BHOoi]

Thanks, I do have adv surface ext in creo . I have style module too. Just wonder what options do I have when creating crown surface.

[TomD.inPDX]

Ha... one option is to use the style and advanced surfaces and avoid the core functionality all together.

I don't have either so I make due.

[Constantin]

I was also going to suggest Style (ISDX).
I tested it and it will create a trimmed face, which means a larger (4 boundary) surface that you do not see and which is trimmed (by the system) to the selected boundary curves.
Pretty neat!

[BHOoi]

Great, Contantin. Possible to share the proe  file? Thanks!

[Constantin]

Unfortunately I can not attach the model, there is too much stuff in the start part that I cannot send out...
But here is an image:

[Jacek_Mydlikows]

I recommend to follow my surface modeling tutorials to solve cases like this - 3&5 sided surfaces

https://drive.google.com/folderview?id=0B60eG4B19bE4VWpjaFlBNlZuMzg&usp=sharing

[BHOoi]

Thanks for sharing.