To create a convex edge from scratch, all you need to do is pick your starting angle, the angle you want the shoulders to be ground at, and make two brand new bevels (called the primary bevels) at that angle, making sure that both bevels reach all the way to the edge. You’ll know you’ve reached the edge when you can detect a burr from each side when sharpening the opposite side. There is a detailed description of drawing the burr here: Drawing a Burr. Once you’ve reground the bevels to the lowest angle, progress through the grits until you achieve the desired level of polish. Then, move the L-brackets out to the angle you’d like for your final angle and create a small bevel (called the edge bevel) using the fine stones. This only takes a moment. Move the L-brackets in 1 or 2 degrees and create another bevel (called the secondary bevel) in between the primary bevel and the edge bevel. Creating the secondary bevel is very fast. Once all three bevels are created, clean the blade well and move the L-brackets in to the lowest angle, the angle of the primary bevel. Strop the knife at this angle until the bevels are blended into a continuous curve giving you a precise, convex edge. The video below shows the entire process or you can go here for more detailed instructions.