To Define a Turn Profile by Creating a Reference Envelope
Use this technique if your reference part has a non-circular cross section.
1. Ensure that you have created a turning envelope.
2. On the Turn Profile tab, click 
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.3. Click the Placement tab and specify the reference coordinate system in the Placement Csys collector. A Turning Envelope of the reference part is generated and displayed as a closed loop of cyan entities, with all vertices highlighted in green.
4. If necessary, adjust the curve using the options on the Profiles tab.
5. Click 
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