Lately I have been using my yoshihiro carbon usuba a lot. I sharpen it until it can push cut regular paper and feels very sharp. I put on a microbevel with just a few strokes and I can see that bevel glint in the light.
Now I am doing katsuramuki and after a few cucumber the knife is noticeably duller. Same with shaving green onions, after a single bunch of onions I can feel it is duller. Need to strop and all is right. Wire edge? I thought the microbevel should take care of that. I mean it isn't dull, still sharp but not as razor sharp as when I start. This can't be normal can it? Could my microbevel be too small to be effective? Would another stone help? Currently use bester1200 and arashiyama6000
roughly what angle are you doing the microbevel at? how does the ura look? Are you using a flat grind on the bevel or is it more hamagurbia? Do you do anything to clean up the edge for burrs/ wire edge after putting on the microbevel? Is there a chance you are rounding the edge on your strops? What stropping compounds are you using?
You can still get a wire edge after you put a micro but I usually don't get this sort of problem on carbon. How much pressure are you applying when you put the micro? It should be pretty light. If you deform the edge too much while applying the microbevel, you may form another wire edge.
Also, exactly what do you mean by "noticeably duller?" Does it still push-cut paper? Does it still shave easily with both sides of the edge?
that sounds like it would likely be a wire edge. i only experience noticeable dulling after prolonged board contact. it's not the best way to remove a wire edge, but try lightly pulling the edge on the corner of your cutting board a couple times before you start processing food, and see if your edge lasts longer.
Canada's Sharpest Lefty
I don't see a problem with that. It's an effective way to remove burrs...
Whoa lots of questions!
Originally Posted by JBroida
Microbevel seems like roughly a 20-25 degree angle? I don't really know how to answer how the ura looks....not really sure what I'm looking for. I mean it definitely goes all the way to the edge and its fairly even all the way around.
At first I followed your videos for the hamaguriba however I realized after I was lifting the blade too high when I did the edge. I wasn't getting the edge completely. Also I have to admit that when i am supposed to see two distinct bevels I see nothing...after I "round" the two bevels, I can feel it on the stone but again...I see nothing. Am I blind? Maybe I dont know what to look for.
Anyways, now when I sharpen I do the edge first, then pretty much lay the big bevel flat and try to flatten it. I don't really go to town to flatten it, just do it a little bit each time I sharpen.
Also, I took the microbevel off and actually am seeing some improvement so at least I can narrow it down to knowing that I need to fix my microbevel.
i also thinK I was going too hard on the strops. I use leather (not sure what kind...some scrap leather from a store) on This Site Not Allowed Here.com chro..ox...I have been using a much lighter touch (pretty much just the weight of the knife)..and much slower...and also seeing better results. Hard to say what exactly did it since I am too impatient to try changing one thing at a time.
One more question...what angle do you strop at? I read slightly higher than the edge angle...but what about when I have a microbevel? I was a bit confused about that.
If it feels that dull that quickly, it has to be a wire edge, and stropping will mostly 're-align' the wire edge at this point.
Stropping on most leather with preassure will round the edges so thats usually a 'weight of the knife' thing.
With or without a microbevel, when stropping (trailing edge), lift the spine and gently & slowly push forward...keep lifting the spine until the edge just bites into the leather...thats your angle
personnaly, i dont see how stropping angle matters. leather isnt solid like a stone, so as long as your in the ballpark and arent putting pressure on the knife you should be fine. the leather will bend slightly and cover the rest of the edge.
i think angle matters at least as much with stropping as it does with a stone, as it's easy to actually blunt the edge on a strop when you let the knife dig in too much. leather gives a lot, even when you don't think you're putting much pressure on it. it's less of a problem with balsa.
Originally Posted by Dubsy
wait, you can strop with balsa wood?