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Sep 29, 2016 at 9:32 comment added keshlam Note that the basic principle described here applied to sanding too -- after establishing an even surface (which takes the most work), each finer grade of sandpaper is really being used to remove the scratches from the previous grade and replace them with smaller ones, until you reach a point where the new scratches are too small to matter.
Sep 28, 2016 at 7:36 comment added Graphus 10x magnification is enough if someone wants to visually inspect their wear edges and gauge sharpening progression, so a cheap plastic loupe or a small barrel magnifier are sufficient.
Sep 27, 2016 at 17:50 comment added aaron I'll add 2 things: 1. you can judge some of this by feel - but that takes experience too 2. you can use trial and error - start with the finest grade, and if you notice an improvement within a short amount of sharpening time, keep going. If there's no improvement, it means you need to go to a coarser grade.
Sep 27, 2016 at 17:03 vote accept James Youngman
Sep 27, 2016 at 15:29 history answered Bernhard Hofmann CC BY-SA 3.0