Hi Mactec
In the end I did not use the information you sent me confidentially. I used micro-photography instead, off Chinese belts and pulleys and off a genuine Gates belt. The attached jpg shows how I did it.
Attachment 387054
Yeah, I had to read the Gates patent several times to get some idea of what to do. They did try hard to be obscure.
To explain the jpg: microphotography of the profile, then import jpg into Autosketch, then start fitting a complex curve to the shapes. If any of them come out similar to what you sent me, fair enough. After all, they should be similar if we are talking about the same profile. And yes, it took quite a while to get a good match.
Cheers
Roger
EDIT: some companies will actually provide you with 'engineering' drawings of the pulleys. You have to look rather closely at them: some of those drawings actually have the tooth profiles in some quite accurate detail. Yeah, arc radii, arc centres, etc. Very helpful. I also used them.