Valid Body with volume equal to zero 2

[PSI-CAD]

Hi everybody

I have a valid Body with volume equal to zero (in NX7.5 and NX8.02) !!!

Does anybody found the same problem ?

Thanks in advance




Regards
Didier Psaltopoulos

http://www.psi-cad.com

 

[cowski]

Are you sure it is not a sheet body?
Can you post a picture or even better, the part file?

www.nxjournaling.com

 

[jerry1423]

a picture with the part navagator, and the part, showing would be nice

 

[JohnRBaker]

How are you measuring the volume of this 'valid Body'?

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:

To an Engineer, the glass is twice as big as it needs to be.

 

[PSI-CAD]

Hi,

It's not a sheet body and I calculate it with Analysis / Measure Bodies

Have a look at the picture




Regards
Didier Psaltopoulos

http://www.psi-cad.com

 

[jerry1423]

Wow a black hole part !

Maybe do an Examine Geometry and see what comes up.
Analysis -> Examine Geometry

 

[PSI-CAD]

Hi Jerry,

I start my post by saying that I have a valid body. It mean that I know the way to examine it !!!

I was able to isolate the region with volume equal to zero. So I have attached the part which it's no more confidential.

Have a look and thanks a lot to your feedback


Regards
Didier Psaltopoulos

http://www.psi-cad.com

 

[cowski]

The part posted fails geometry checks.
It reports as a solid body, but the outer bosses appear to be missing faces. If you trim those off, then the body passes geometry checks.

www.nxjournaling.com

 

[PSI-CAD]

Hi,

Did you select the body or all selectable entities ?

I found sometimes that I have tiny and misaligned edges on a valid body but It's the first I have a volume equal to 0

I agree with you that some faces didn't appear in shading

What do you mean by "trim those off" ?

Could you send me the clean part to understand ?

Thanks


Regards
Didier Psaltopoulos

http://www.psi-cad.com

 

[cowski]

When I select all the geometry and run the check, it returns a modeling error and crashes the examine geometry check (a sure sign of bad input). I just used 2 datum planes to trim off the ends (including the bosses), the remaining geometry passed the checks.

Looks like you'll have to try to fix the bosses. I see from your picture that it is a dumb solid, have you tried Heal Geometry?

www.nxjournaling.com

 

[PSI-CAD]

Hi Cowski

I didn't understand your first answer.

I have used trim body to isolate the problem. But i didn't see the shading problem in this area.

I thought is was enough to select only the body for checking validity.

It seems to be a bug.


Regards
Didier Psaltopoulos

http://www.psi-cad.com

 

[cowski]

I thought is was enough to select only the body for checking validity.

That will only allow you to run the body checks. To run all the checks you need to use select all or use a window selection (make sure your filter is set to "no selection filter"), this will pick up the faces and edges along with the solid itself.

Good news: I ran the heal geometry on the chunk of the body you posted and it fixed the problems and then passed the geometry checks. Heal geometry can be found at File -> Export -> Heal Geometry...

www.nxjournaling.com

 

[PSI-CAD]

Hi Cowski,

Thanks a lot for this very good answer. I never used heal geometry, it's very helpful.

What's the purpose of checking the solid if it's not enough ?


Regards
Didier Psaltopoulos

http://www.psi-cad.com

 

[Toost]

When you buy a car you will not only check the oil level , you will most probably look at other details too.
On large models the examine geometry can take considerable time to compute, then it is nice to be able to isolate the checking into smaller checks.