Contour Flange Failure

[VictorBDEngineer]

I have a part which fails to produce a contour flange. The sketch consists of an arc connected to a spline. Both the arc and the spline as individual elements produce a perfect contour flange but when I join them the coutour flange operation fails.

   Sheet Metal: Contour Flange Creation failed.
     Outer Strap.ipt: Errors occurred during update
       The attempted operation did not produce a meaningful result. Try with different inputs.
         Try decreasing bend radius
           Feature Compute failed.

Could somebody please help with this. I am trying to model a wrist cuff.

I am using Inventor 2014.

Regards

Victor Pringle

[JDMather]

Spline not tangent to arc.

[LT.Rusty · Accepted solution]

The problem has to do with the way the spline interacted with the circle.  Inventor wanted to make that a bend.  Take a look at the modifications I made to your sketch.  First, I made the start of the spline tangent to the circle.  Then I opened up the profile of the spline a bit to move it away from the circle, to prevent any overlaps, which would also cause some errors.

[VictorBDEngineer]

Thank you. If only Inventor had told me that was all it required to fix it. I will certainly remember for the next time I do something like this again.

Thank you once again.

[LT.Rusty]

Just remember: Inventor can't interpret your design intent.  When you have non-tangent edges in a profile intended for a contour flange, Inventor will apply a fillet to those profile corners to create the bend.  So far as I know - and I could be wrong, I haven't tested this exhaustively - you can't fillet the end of a spline.