Unfolding/ripping round tubing with both ends notched

[Zaira_engineer_SAE]

Hello everyone 

I have been trying to unfold round tubing made through the frame generator. 

Here are the steps I took: 

1. Used Frame Generator 

* both ends of the tube are notched

2. Opened part and converted into sheet metal

3. Used the following tutorial:

http://forums.autodesk.com/t5/Autodesk-Inventor/Unfold-a-tube/td-p/3168764

4. Was not working so I drew sketches on both ends of the notched tubing and added points 

5. Used rip tool (point to point) and did not work 

* I made sure the thickness was the same 

I thought I was doing something wrong so I generated a new round tubing frame with only 1 end notched and the other end flat and followed the tutorial. IT WORKED! 

I have came to the conclusion that you can not use the rip tool on tubing that has both ends notched.

Is there a way where I can cut the tubing in half so I have 2 individual pieces/files of tubing with 1 end flat and 1 end notched?  

Thank you

[rdyson]

Create the rip before the first split, but the flat pattern will be next to useless.

[JDMather]

How will the part be manufactured?

In the flat pattern will the cut edges be perpendicular to the flat?