NX7.5: Thicken Failure Analysis

[AeroEngin]

Good morning, everyone.
I have a sheet body I tried to thicken this morning, but the thicken operation failed. I clicked the "Show failure data" button in the thicken menu, but I am unsure how to interpret the results. The information window provides the following info:

Error data: ifail = 1075 , state = 0

Thickening failure

Minimum radius value = 16.85000000000
was found at 1 point located at coneheads with solid font
Minimum radius value = 0.32500000000
was found at 1 point located at coneheads with dotted font

I have attached a screen-shot for reference. What I'm wondering is if anyone can tell me how to interpret thicken failure results in general.

Thanks!

 

[JohnRBaker]

What value for 'Thickness' did you enter?

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

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

 

[AeroEngin]

Hi John,
I needed to thicken the part to 0.100". It will thicken up to some fraction of that (I think it was .085 or .095"), but it won't thicken to what I need. I found that by removing the offending blends from the sheet body, I could thicken the part, then apply the blends to the solid body that resulted.

Thanks!

 

[JohnRBaker]

Sometimes, that's the approach one has to take. Blends are tricky things.

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

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

 

[Toost]

The reason it doesn't want to thicken, is that the faces have a curvature (radius) smaller than the thickness entered.
Consider a "U"- shape. trying to thicken the "U" outwards will accept any value but inwards only some value before the offset face intersects itself.
Applying thicken on a "S" shape will have problems in both directions at a certain value, it has curvature in both directions.
On your model, the highlighted face has curvature in both directions. Probably due to the surrounding faces.
( Reading your post , the value presented should accept an offset of 0.1, the min radius noted is 0.325. Strange.)

Regards,
Tomas

 

[cowski]

I'd suggest running "examine geometry" on the original sheet body to make sure it doesn't have any problems with the underlying geometry.

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