NX unite and subtract reversed!

[Lolly12]

thread561-176251

Hello everyone!
I recently experienced two times the same problem described in the post above, both on the same file converted from a STEP file.

Does anyone knows if the question of the previous post got an answer??

At first, after the conversion from STEP, I operated with unite/subtract on the model without problems.
After some days I reopened the file and I wantet to subtract a new solid: the operations were inverted.

It occurred a second time today in a different way: a unite operation alrady existed, I modified a previous feature (in a completely different area of the model), and the unite operation was inverted, resulting in a failure of the whole feature tree!

Can someone help me?

 

[cowski]

I suspect that the STEP file has some bad geometry. I recommend running "optimize face" and "examine geometry" right after importing geometry from STEP files.
faq561-2116

www.nxjournaling.com

 

[jerry1423]

Run EXAMINE GEOMETRY on all the solid bodies before and after the unites or subtractions that you do.

Jerry J.
UGV5-NX1899

 

[Toost]

Use Information- Object and select a single face of the "strange solid".
NX will display an arrow on that face depicting the surface Normal.
This normal must point out from the volume, else that solid is inverted.
I have seen maybe 2 or 3 inverted solids in my 30 years of NX, but when that happens, nothing works as expected.

Regards,
Tomas

The more you know about a subject, the more you know how little you know about that subject.