Hans,
That’s a great idea for the roofing. I should be able to make an adequate die using a dado blade in my table saw or even the radial arm saw.
Which do you like best, the spline tool or the pizza cutter?
Richard
In the meantime I modified the spline tool, easier than modifying the pizza cutter.
(http://www.rhb-grischun.ca/P1/AluRoof03_s.jpg)
The result is somewhere between the radius and the rather sharp corner of the pizza cutter. Next step is planned for this weekend. Had a bit of a health problem this week which cramped my “style”.
Jack Verducci in his book, Building Structures for Garden Raiways has a design made of brass rods for making corrugated roofing from most metal materials. Make it any size you like.