I'll pass on a great tool/technique.
Get a magnetic base digital inclinometer. The name sounds expensive, but Woodcraft and Rockler ( and others) sell it for about $30-45. You can set up any work table to be at any angle desired in seconds, square the drill bit to the table on a press, set your table saw blade at any angle,...or my favorite...place it on the blade for grinding or sharpening. You will know the angle of the edge to .1 degree.
Here is an article on one:
http://www.woodshopdemos.com/nprod-24.htm