Similar approach: I discovered that the plotting accuracy of today's ink jet printers is quite impressive (on a Mac at least, don't know how well it works on a windows system) and the drafting ability of many drawing programs (MacDraw, ClarisDraw, Canvas, probably the CAD packages too) is just as good. Combining these, I have found that one can make setting circles which are very servicable by just drawing them on the computer, printing them out on the ink jet printer and laminating them to plywood circles using liquid epoxy. They are at least as accurate as 0.1 degrees which is about as good as you can read a circle anyway. I have even made verniers for the circles this way. If anyone wants details, I can expand on the technique. Attached is a picture of a 24" RA circle I made this way. The small divisions are one minute of RA in size. The circle is for a big reverse fork mount I am working on.