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nmunro
777 Views, 8 Replies

Rangebox error in sheet metal part with spline

The attached part displays some odd behavior (see the embedded VBA macro T2). The size of the part and the flat pattern extents (40mm x 558.8mm) are reported correctly in Inventor's internal flat pattern properties, but the rangebox information for both the folded and flat model is wildly innacurate for the X value. This seems directly related to the spline based edge on the part.

 

What spline data is causing the disparity? I know that the rangebox object is only guaranteed to contain the body, but with such a large error it makes the use of the rangebox for any body based on spline geometry pretty much useless.

 

How is Inventor calculating extents internally? Is it a ray based approach, or a study of edge data? From a programming perspective, how can we get a result that will always return a reasonably accurate description of the size of the part?

 

Neil

 

 

        


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