Here is how I did it with SW 2012:
First create a path sketch.
For this open a sketch on the top plane as this plane is in the center of of the part.
Use the 'Convert Entities' command and select the two edges that will be the sharp portion of the blade.
Here you can see the path sketch is in the center of our part.
Now create a new plane.
choose the pink edge and make the plane 30 degrees from the purple face.
create the following sketch on the plane created in step 5.
Make sure that it is larger then the part and that the point of the blade (in orange) is pierced to the path sketch.
Use the 'Swept Cut' command.
Select the profile and path sketch.
Accept by clicking the green check and here are the results.