When re-profiling an edge on my belt sander, a burr is the indicator that, the profile of the angle has reached all the way down to the edge. The shallower the angle, the more easily a burr is obtained. The angle you choose will determine strength VS. Razor like sharpness of the edge. You must then move on to the finer grit, so as not to take off too much material, shortening the blade height. If you don't get the new profile all the way down to the edge, as indicated by the burr or visually, the blade won't end up sharp, no matter how pretty and shiny it is. Some steels show this burr more easily than others. SR101 shows pretty good, and will get very sharp. If you are going with a shallow angle and not seeing a burr, you may be applying too much pressure on the blade. Hope this helps.
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