I semi-recently purchased a Becker BK-7. When it came from the factory, it was shaving sharp... not quite Spyderco NIB sharp, but pretty close. I used it a couple times for some pretty heavy outdoor work, and the edges became a bit duller. They were still sharp, almost shaving sharp, but I decided to give it a touchup on the Sharpmaker. At first I sharpened it at 30 degrees, which is what it came with from the factory. After the standard 20 passes on each of the 4 steps, it was significantly less sharp than before I began. I tried again, and the results were no better. So I gave it about 50 passes on the gray corners, and then tried sharpening it at 40 degrees, trying 20 passes on all 4 steps. However, the results were even worse than before. It will just barely cut paper, and has a very tough time with cardboard.
I'm not sure why this is happening... maybe it is because of the blade material, or perhaps because of the length, but I don't have this trouble with my other knives. To reassure myself, I went ahead and sharpened my Delica, and I got it hair-popping sharp in a matter of minutes. Does anyone have any suggestions as to what I should try next?