Thanks again for the comments.
Joe, I am slowly decreasing my collection.
Jeremy, I start by setting the fence from the angle drawn on an 8 x 11 paper drawn in Auto Cad. Once I set the fence I cut enough segments from 1/4" x 3" MDF strips to complete a quarter ring. I then tape these segments together and check that they make a perfect 90 degree angle. If not I do some tweaking by trial and error.
Hank, Yes I did just as you said.