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acis error, infinite something

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elephantwalker
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acis error, infinite something

See the error in the screen capture here. 

Screenshot 2024-03-18 225627.png

 See the f3d file below to reproduce this error. I found that this is an error message by ACIS, very esoteric. Infinity is an idea, not a number.  

 

From the ACIS appendix documentation this error is :

 

 NO_OUTSIDE_SHELL . . . . . . . . . . . . . . . . . . . . . eulr/euler/kerndata/seplumps/seplumps.msg
“infinite body – no bounding shell found”

 

Any ideas? 

 

-Lawrence

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Message 2 of 3


@elephantwalker wrote:

Any ideas? 


@elephantwalker 

If I go back to the beginning and check the imported body before any actions were done - Fusion reports 58 invalid surfaces.

TheCADWhisperer_0-1710851335059.png

If I attempt to Repair...

TheCADWhisperer_0-1710851569096.png

 

Message 3 of 3

Hi,

 

I want to thank you for pointing me in the right direction. The problem is indeed the openVSP export. I experimented with options for export, and found the reducing the step tolerance to 0.001 reduces the number of bad patches to 12. By going through a series of repair and stitch cycles, I was able to get a working body. The key bit was at one cross section at 25 mm or so, this could not be repaired. So I took a small patch between the bodies near 25 mm, and used the point along a path to get consistent linear rails between the faces, and was able to loft the bodies together.

 

Why would I do all of this work, instead of designing the wing in fusion 360? The original design is from the prototype for the Mars wing mission. I wanted to make a toy rc wing that was close to the prototype, less than 250 g, that could be easily 3d printed. I am using Tom Staton's wing design/print method.

workingopenVSPstepsettings.png

 

Your help in pointing to the validate tool was the key bit that took me across the finish line. Thanks Man!

 

-Lawrence

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