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Floating Donut...

Pioneer
Pioneer

Hello all,

 

SO long story short, there's a random glitch that occurs when I subctract two solids from each other... 

 

And then, THIS DONUT appears! 

Has anyone else had something similar? We can not get rid of it. 

 

Donut.PNG

 

If anyone has experienced similar, we'd like to hear.

 

Thanks,

Ray

11 REPLIES

Re: Floating Donut...

Siemens Phenom Siemens Phenom
Siemens Phenom

Hi,

 

This is probably a face that is not trimmed correctly. Without the actual part there is not much we can say about it.

 

Regards, **bleep**

Re: Floating Donut...

Pioneer
Pioneer

Hi,

 

I did not model the floating donut. It just appeared out of no where.

 

Is this common? This has happened on two parts now.

 

Regards,

Ray

Re: Floating Donut...

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor

So you are subtracting solid B from solid A

I'm suspecting solid B has a "hole" in it.

If you do a "modeling" section of solid B (before the subtract), is the cross section "solid" or is there a "hole"?

Ken Akerboom Sr CAx Systems Engr, Moog, Inc.
Production: NX10.0.3.5 MP16/TC11.2
I'd rather be e-steamed than e-diseaseled


Re: Floating Donut...

Pioneer
Pioneer

Hope this helps visualize...

 

The green part is BB.PNG

 

Cross sectioned, it is solid.

B cross section.PNG

 

This yellow block is A 

A.PNG

 

When Cross sectioned, it is also solid.

 

A cross section.PNG

 

Now, Subtracting B from A looks like...

 

Subtracting.PNG

 

 

 

 

Final product is this... with a floating donut shape... where does this come from?!Donut.PNG

 

 

 

Re: Floating Donut...

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor

I'm guessing that one of the blends is ignoring its trim boundaries after the subtract command.

 

I've seen something similar when a blend face ran amok. I ran the "examine geometry" command and found that one of the bodies had some geometry errors that needed to be fixed. After the corrections, the part behaved in the expected manner.

Re: Floating Donut...

Siemens Honored Contributor Siemens Honored Contributor
Siemens Honored Contributor

Were both of these parts created from scratch in NX?  If they weren't you could try using the Optimize Face command to clean up the geometry and as @cowski1 suggests, use Examine Geometry to locate any potential issues.  I've seen similar issues that were sent to the Parasolid development team to review, so if you're not able to resolve the condition please consider opening a new IR with GTAC.
You tagged this NX10, but are you using the latest version; NX10.0.3?  Do you have NX11 available to test the same boolean?  I'd be curious to know if it's something that occurs in newer versions.

 

Regards, Ben

Re: Floating Donut...

Pioneer
Pioneer

We use both NX8 and 10 at the moment. We have an available upgrade to 11... In this long process of transitioning over. 

 

Our license server currently does not have 11 available. 

 

I will try Optimize Face and Examine Geometry.

Re: Floating Donut...

Pioneer
Pioneer

Ben,

 

I can not believe this worked.Finished.PNG

 

The DONUT IS GONE!

 

Thanks! 

Re: Floating Donut...

Siemens Honored Contributor Siemens Honored Contributor
Siemens Honored Contributor
That's great!! Out of interest, were the bodies created in NX, and if not what product was used?

Regards, Ben