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Jul 11, 2012 04:04 PM

Time for a New Knife?

I have a 7" Wüsthof Grand Prix Santoku (Original, not GP II) with what used to be called "kullens" ground into the blade, similar to this:

Over the years, sharpening has worn it down so now the edge is well into the hollow ground area. This has made the edge uneven. Is it time to look for another?

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  1. Time for a New Knife?

    Yes,yes it is..... :-D

    1 Reply
    1. Post a pic up. Maybe and maybe not time to replace it. A true Ganton edge is in the dimples and is fine.

      1. New knife,granton edges are overrated anyway....

        1 Reply
        1. re: petek

          Any time is The time for a new knife!

        2. Two questions:
          How do you sharpen?
          Could you post a pic?

          Sharpening a knife into the hollows doesn't necessarily ruin a knife. Often, it's no problem at all. If you're well into the hollows, depending on how you sharpen, you might find that the parts of the edge under the hollows begin to retreat just a bit (that is, they no longer touch the board while you're cutting), and that can be a problem.

          I'm also inclined to side with Petek - you really don't need too much of an excuse to buy a new knife. They're like old knives but shinier.

          5 Replies
          1. re: cowboyardee

            Hi cowboyardee. Is there a way to get a good edge on one – after the edge recedes into the dimples? I tried a couple times and eventually gave up.

            1. re: JavaBean

              I believe so. While I have never work with the situation you described, I have worked with knives with "wavy" or "uneven" edge. Basically, some areas along the knife edge is hollowed out. They are not designed, but they have the same challenge as the granton edge. I find it to be helpful to first grind the knife edge along and parallel with the length of the knife, as oppose the typical perpendicular motion. I remember cowboy has a different technique to handle this, and I will let he describes his version.

              1. re: JavaBean

                You can get a good edge once it retreats into the dimples, in most cases. There are possible exceptions if the dimples are very deep or if the temper of the steel that high on the knife is off for one reason or another.

                Again, 2 questions -
                Exactly what problem did you have? (wavy edge, retreating edge at the dimples, or just increasing difficulty achieving a sharp edge)
                Also how do you sharpen? (i seem to recall you're a fellow freehand sharpener, but I'm not positive)

                Assuming the most likely problems (the edge is retreating at the dimples or else is becoming wavy) and that you are indeed a freehand sharpener, the solution is pretty much what chem said - sharpen lengthwise on the stone so that more of the edge is contacting the stone at once, and so any retreating parts of the knife's edge aren't touching the stone until the edge is more even. More or less the same technique I describe here:

                One more thing that will help - thin behind the edge. That is, sharpen at a more acute angle to thin the shoulder or top of the edge bevel. Basically, you're trying to make the edge bevel a little less uneven in width, so that future sharpening doesn't tend as much to warp or retreat the cutting edge over time.

                1. re: cowboyardee

                  Thanks cowboyardee. Yes, I’ve been sharpening free hand for quite some time now. I recall making some sectional and lengthwise passes, but only parts of the edge would contact the stone. I thought leveling the bevel area to get the high and low spot more even might do it, but I was reluctant to try b/c the knives belonged to my wife co-workers. My sis-in-law has one, so I’ll give it a try on hers.

                  Hey Chemicalkinetics. Speaking of wavy edges, the old sabatier (restoration guinea pig) that I just got was twisted like a snake. I bent it and then stuck in a vice a couple of days…got straight enough to make working on resetting the edge / fixing the divot much easier.

                2. re: JavaBean

                  If the edge is ground into the dimples it's past time for a new knife IMO.

              2. Knife Pics. One of what it looked like new and two of what it looks like now.

                6 Replies
                1. re: al b. darned

                  You can keep on sharepning it, but it may also be easier tor you to buy a new knife. Maybe it is a sign for you to get a Japanese made Santoku now. :P

                  1. re: Chemicalkinetics

                    Something like that would probably too nice to use, lest I ruin it. I have a set of wood chisels my Dad gave me like that .Now where's that Ginsu knife?

                    1. re: al b. darned

                      <Something like that would probably too nice to use,>

                      I believe you can get a good Japanese made Santoku at a lower or equal price point of your Wusthof Santoku.

                        1. re: al b. darned

                          I have so many recommendations, but I will list just two for now.

                          For a stainless steel knife:

                          Tojiro DP Santoku for $70:


                          For a carbon steel edge knife:

                          Hiromoto AS Santoku for $92-114:


                          1. re: Chemicalkinetics

                            Thanks, Chem. Now I just need to thin down the list before I give it to Santa...if I can wait that long.