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Sheet metal - creating a sheet metal tube?

Sheet metal - creating a sheet metal tube?

Sheet metal - creating a sheet metal tube?

(OP)
Ok... this sounds like it would be easy, but I sure can't figure it out.

I need to make a tube in sheet metal.  Only reason for this is to generate a proper flat-pattern for our toolshop.  

I've gone as far as drawing a 3D sketch of the tube (without thickness), and trying to 'face' it, but inventor doesn't see it as a closed body.  The tube has to have a tiny split down the length (1/32") just to represent the gap needed to weld.  

Am I making sense?  Anyone know how to do what I'm trying to do?

30.7in OD (778mm), 1/4" steel plate.  7" tube length.

Inventor 2008.

RE: Sheet metal - creating a sheet metal tube?

(OP)
Never mind.  Figured it out... wasn't anything special.  
-draw 1/4 x 7" rectangle
-revolve
-extrude a small slice down the length
-sheet metal styles set to 1/4"
-flat pattern.  works fine.

Mod's feel free to delete.   

RE: Sheet metal - creating a sheet metal tube?

Draw an arc (ID or OD of your pipe) with the 1/32" dimension between the ends (constrained appropriately of course) and use the contour flange command.

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