Wireframe > Curve All Edges
Activate Solid Selection icon
Solid Face selection
Select the face required
Once desired faces are selected End Selection
Transform > Roll
Chain desired geometry
Set to Copy and Unroll. Then enter outside diameter of part.
Note: In some cases your toolpath will not line up with your model after you do the axis substitution toolpath. You may need to adjust the Positioning Angle so they line up.
Toolpath > Contour
Select C-plane > Chain
Then select the unrolled geometry.
Review all toolpath parameters (as you would in any toolpath).
Under Axis Control select Rotary Axis Control
Under Rotation Type select Axis Substitution
Under Axis Substitution select appropriate axis (in this example select Y axis is used).
Enter Rotary Diameter (Outside diameter of part)
To review toolpath,
Under Operations Manager select Backplot
Press Play to backplot your operation