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flatten sheet metal

billy2billy2 Member, OS Professional, Mentor, Developers, User Group Leader Posts: 1,484 PRO
I do more flattening than sheet metaling.

I'm trying to stretch the boundaries for sheet metal flattening. A couple of years ago I was schooled in ruled based surfaces and what it means to flatten these things out. I've read the OS sheet metal manual and can make a sheet metal part using all methods.

But....

My sketch has a spline, line & arc, extruded into a surface, made into sheetmetal & flattening succeeds:


Add draft to the surfaces and the flattening fails:


I believe they're still ruled surfaces but OS doesn't like them now, have I reached a cliff?


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