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TOPIC: how do you sharpen your recurve ZT350 or ZT300?

how do you sharpen your recurve ZT350 or ZT300? 1 year 11 months ago #4812

  • Scott Sherman
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I am a new knife owner and now have a ZT 350 and the ZT560 along with a number of other Shun kitchen knives and a bunch of less interesting knives. I have been following as many forums and youtubes as I could but I have not really found anything showing or detailing how to sharpen the recurve portion of the blade. I have ordered a WEPS with diamond grit flat stones up to 1000 grit and a flat fine ceramic stone, but I have ordered a pair of curved ceramic stones that are labeled 400 and 600 grit. Since I am new to this whole world, I am not clear on whether the ceramic 400 and 600 stones are going to be finer than the 1000 diamond grit stones. Would the round ceramic 600 stone leave a mirror finish or is it just going to be the same as if I used a 600 grit diamond stone (but curved)?

Sorry if this is considered a dumb question, but I am very excited in anticipation of getting this setup. I want to order the right stones and accessories for my knives.
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Re: how do you sharpen your recurve ZT350 or ZT300? 1 year 11 months ago #4815

  • wickededge
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Good questions - first I think you'll be able to sharpen both those knives with the flat stones since the curves aren't very tight. Second, the 600 grit ceramic is similar to the 600 grit diamond though the diamond will be more coarse until it's broken in.
ScottSherman wrote:
I am a new knife owner and now have a ZT 350 and the ZT560 along with a number of other Shun kitchen knives and a bunch of less interesting knives. I have been following as many forums and youtubes as I could but I have not really found anything showing or detailing how to sharpen the recurve portion of the blade. I have ordered a WEPS with diamond grit flat stones up to 1000 grit and a flat fine ceramic stone, but I have ordered a pair of curved ceramic stones that are labeled 400 and 600 grit. Since I am new to this whole world, I am not clear on whether the ceramic 400 and 600 stones are going to be finer than the 1000 diamond grit stones. Would the round ceramic 600 stone leave a mirror finish or is it just going to be the same as if I used a 600 grit diamond stone (but curved)?

Sorry if this is considered a dumb question, but I am very excited in anticipation of getting this setup. I want to order the right stones and accessories for my knives.
--Clay Allison
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Re: how do you sharpen your recurve ZT350 or ZT300? 1 year 11 months ago #4820

  • StevenPinson
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I have posted on this before somewhere on the board (too lazy to look). I used my own naniwa stone setup and stropped with thick balsa using some CBn spray. YMMV

i1133.photobucket.com/albums/m599/SPIN1963/DSCN0115.jpg
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Re: how do you sharpen your recurve ZT350 or ZT300? 1 year 11 months ago #4821

  • martinlind
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i did my ZT 0200 with flat stones no problems.
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Re: how do you sharpen your recurve ZT350 or ZT300? 1 year 11 months ago #4822

  • Scott Sherman
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What angle did I you use. I imagine the smaller the angel the more the flat stone would lay against the wall of the blade while a greater angel would result in the flat blade resting more in the High side of the valley of the recurve so that the sides of the flat stone will touch metal while the middle of the flat stone will have a empty space under it with no blade edge contact.

I guess my question then is what is the largest angel at which the entire flat edge of the stone is evenly touching the surface on the side of the edge. To make the point, for example, if I lay the flat stone 90 degrees perpendicular to the recurve section of the blade edge only the sides of the flate surface of the stone would be touching steel. At say, 5 or 10 or maybe even 15 degrees, I imagine most if not all of the stone would be in contact with the metal as it drags across the surface to sharpen the edge. But when (what angel) does the middle of the stone loose contact

Hope that makes sense, it's a bit hard to describe.

I guess the way to calculate that would be to paint the side of the blade with a marker and draw a flat blade across it until it starts to loose contact in the center of the stone and it leaves sled marks. If someone with a ZT 350 can do that experiment it would be great. If not I will do it when I receive my WEPS system for you folks and document the angels with some pictures. I am not sure when that will be just yet but they said maybe a week or two + shipping time due to filling back orders before me.
Last Edit: 1 year 11 months ago by Scott Sherman.
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Re: how do you sharpen your recurve ZT350 or ZT300? 1 year 11 months ago #4829

  • cbwx34
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ScottSherman wrote:
What angle did I you use. I imagine the smaller the angel the more the flat stone would lay against the wall of the blade while a greater angel would result in the flat blade resting more in the High side of the valley of the recurve so that the sides of the flat stone will touch metal while the middle of the flat stone will have a empty space under it with no blade edge contact.

I guess my question then is what is the largest angel at which the entire flat edge of the stone is evenly touching the surface on the side of the edge. To make the point, for example, if I lay the flat stone 90 degrees perpendicular to the recurve section of the blade edge only the sides of the flate surface of the stone would be touching steel. At say, 5 or 10 or maybe even 15 degrees, I imagine most if not all of the stone would be in contact with the metal as it drags across the surface to sharpen the edge. But when (what angel) does the middle of the stone loose contact

Hope that makes sense, it's a bit hard to describe.

I guess the way to calculate that would be to paint the side of the blade with a marker and draw a flat blade across it until it starts to loose contact in the center of the stone and it leaves sled marks. If someone with a ZT 350 can do that experiment it would be great. If not I will do it when I receive my WEPS system for you folks and document the angels with some pictures. I am not sure when that will be just yet but they said maybe a week or two + shipping time due to filling back orders before me.

Makes perfect sense what you're saying... so to answer your question, I took a flashlight and laid it so the light went down the stone, then laid a ZT0350 flat on the stone and began lifting to create an angle. As soon as you start lifting, the blade loses contact in the center and light shines thru.

But this isn't what you need to worry about. Regardless of the angle you want to sharpen at, enough of the stone will contact to sharpen the recurve. The WE stones, also pivot around the rods, so the stones kind of "flow" (for lack of a better word right now) in and out of the recurve. The trick is to let them do that.

One thing I do on recurves is to work the stone both ways... from the heel out of the recurve, then start at the front of the recurve and work back toward the heel. (This also helps on other knives too, to reach the area right at the heel). You want to avoid "scrubbing" straight up and down in a recurve, like you see in some videos to create a burr... this can create a groove. Always have some motion across the blade. Also, never use alot of pressure... just let the stones work thru the recurve.

My suggestion. Mark the blade with a sharpie, like you suggested. When you get the WE, first practice on a regular knife until you're comfortable with the WE, and how it works. Then, take the recurve blade and match the angle that is currently on the knife. Take your finest stone (not strop) and just lightly work the stone thru the recurve... paying extra attention to how it works in and out of the recurve area. I think you'll quickly see how well the WE works in the recurve area.

Hope this helps! Cool to see your anticipation and excitement! :woohoo:
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