Attached is the scad code, and comments explaining a simple machining process.     If you run the script, and read through the comments, you will see that they broadly refer to the six evolving images, from left to right (f5 will show the tool path). The actual necessary script to create a working example is quite short, and a consists of a few, fairly simple modules - flatten, flatpath, single, blank, path, cutter_profile, and also  ten parameters and three equations for 'chord', 'dg' and 'art'. Equally the machining instructions, either for manual or automatic, are also quite straightforward. The difficulty, as always would be in the fixtures for the workpiece, unless it is a simple blank, as in this example.