I want to srart by thanking Dr. Mather for making this set of tutorials available to us. This sort of thing is the most productive part of comp.cad.solidworks and one of the best aspects of the internet.
This is a very interesting tutorial, but it doesn't produce a normal cut as an endmill would. Prior to deleting faces and creating offset surfaces, the deboss wrap feature creates something close but only an approximation. If you create sketches on planes intersecting the primary axis of the original cylinder and the deboss wrap feature you can see this very clearly. Use the Intersection Curve tool to see how the various faces relate. Each face will produce a straight line, but they are not quite perpendicular. You can see this using the Measure tool or by adding Driven angular dimensions. Either way, you will need to show all 8 decimal places to see the discrepancies in the angular measurement. You can also try forcing the lines to be perpendicular by adding relations.
If you continue on with the tutorial and perform the offset surface operations, the result gets even more interesting. On the same planes you created to explore the cut previously, create additional sketches and use the Intersection Curve tool again. Now, the cut surfaces created by offseting .25 to each side of the original deboss wrap cut face will no longer be straight lines, but splines. Of course, an ideal end mill wouldn't produce a spline like this. I don't yet understand why the offset surfaces result in splines, but they seem to splines with only two control points. Regardless, you can't make the splines perpendicular to both of the adjacent straight lines.
I would be happy to send a SW 2005 model containing sketches as I describe above to anyone interested.
By the way, has anyone been able to use the Wrap, Scribe feature to do anything useful? When I do this on the original cylinder, I get a result that can't be used for subsequent feature generation. The Help is extremely brief and provides no examples.