Clearance Analysis False Hard Interferences

[DHuskic]

I'm a little riddled at some of the hard interferences I am receiving as a part of my Clearance Analysis testing. I am testing an assembly that should be a real life representation of our components once they are assembled. I keep getting false hard interferences that have no penetrating distance, which cannot be subtracted from one another, and where the interference geometry is flat with a distance of 0 from one face to the opposing side. Can anyone help me understand as to why this is happening? It seems to occur often in our assemblies which makes the analysis difficult to use.

DHuskic
Nx8.5 & Nx9.0

 

[Bigwizz]

Hi DHuskic

Are you using lightweight data for the analysis?

I'm using NX9 and for components that are touching (ie bolted together) I get the clearance listed as New(touching) in the Type column of the Clearance Browser.

You can right click the listed interferences and ignore them (they'll be placed in the exclusions folder).

 

[DHuskic]

Everything is fully loaded and the analysis is set to exact. These False Hard Interferences seem to be New(Touching) interferences but for some reason the analysis labels them otherwise.

Problem is when there's upwards of 150-200 Hard interferences, a majority of them appear to be a Touching Interference, not a hard interference. We can't afford not to investigate these in case it is an actual hard interference.

DHuskic
Nx8.5 & Nx9.0

 

[cowski]

DHuskic,
I don't have an answer, but I have been running some interference checks lately and have noticed the same thing. I'm currently using NX 9.0.3.4

www.nxjournaling.com

 

[Bigwizz]

In my clearance browser the New (hard) and New (Touching) have a clearance of 0.00 listed (as you would expect)in the clearance column. However, the New (Touching) also have 0.00 listed in the Distance column.

Are you getting similar?


BTW,
My results are from a round robin check with the default clearance zone set to 0.0mm

 

[DHuskic]

Cowski, I am using the same version as you.

Bigwizz, that is what I am seeing on some components. Others will have a larger penetration depth, but it will be measured as some skewed angle. I'm using the same test as well.

DHuskic
Nx8.5 & Nx9.0

 

[DHuskic]

I reran the clearance analysis on a subset of parts, but only to isolate some of the ones that were causing issues. This time around, the same component pairs that we giving me New(Hard) interferences before, are now touching as they should be.

DHuskic
Nx8.5 & Nx9.0

 

[DHuskic]

In case anyone is interested, attached is a zip file containing a piece part and some images for my executions. Here are the steps to reproduce my error:

To reproduce the steps:
1. Open Nx
2. Open Clearance Analysis Parts.prt without partial loading or lightweight representations
3. Go into modeling
4. Go to Assemblies -> Clearance Analysis -> New Set
5. Double check the settings are as pictured in the attached image
6. Hit Ok
7. Go to Assemblies -> Clearance Analysis -> Clearance Browser to view results(I attached an image of my results)
8. Attempt to subtract one of the pins from the plate, there should be a Tool body completely outside target body alert(I attached an image of the alert and dialog)

Thank you for your time.


DHuskic
Nx8.5 & Nx9.0