I have a horizontal belt grinder that I built,it uses a 2"x72" belt. I have it set up with a 3/4" wheel and a 2" wheel. I mark the serrations at 1/2" on center intervals. Using a 60 grit belt and the 3/4" wheel I grind the serrations, the points are 1/2" apart and the serrations are .093" deep then I mount the blade on an angle jigg I built and use the 2" wheel and a 220 grit belt to grind the bevels on one side then I turn the blade around in the jigg and grind the bevels on the other side of the blade. I use fresh belts and grind slow so as to not over heat the steel and ruin the spring temper (45Rc) of the blades.
One of these days I'll get someone to do the photography and do a work in progress on one of these. My horizontal belt grinder (I call it HEG for horizontal edge grinder) is what makes it very easy to make one of these blades.