Kamikoto.......... sharpening.......

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bsfsu

NZ Japanese knives
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I have had the privilege of sharpening a Kamikoto.......

Can we discuss so I may have a little insight to if my approach will work?

This is the start of thinning the knife
IMG20220602143914.jpg
IMG20220602143933.jpg
 
So........ I basically started removing the steel with as much force as could be mustered.

I'm hopeful that the blade won't be completely destroyed by my approach, my diamond stone has lost its bite, I'm trying but I think I need a wheel....

............... not looking forward to tomorrow's sharpening session.......
 
Soft stainless + high pressure + diamond stone will pull all the diamonds out of the stone and shrink its lifespan rapidly.
To do what you’re trying to do get a coarse Norton alox stone if you’re tied to working on stones. Or get a cheap belt sander and mount it upside down.
That’s not going to be fun.

Also, the edge failed at the geometry it was before. Thinning will make it weaker. Don’t expect it to suddenly become better.

Best option might be cloth backed sandpaper on a mousemat and convex it. Will get it looking ok fairly quickly and you can give it back and run away.
 
Is it really worth the time / effort / money to polish this turd? 😐

Edit: looking up the steel they use I'd say that's a pretty clear no. Made of 420J steel. And they charge 200 bucks for a set of these...what a ripoff!

Chemical Composition​

The chemical composition of stainless steel grade 420J2 is outlined in the following table.

ElementContent (%)
Chromium, Cr14
Nickel, Ni (optional)1
Manganese, Mn1
Silicon, Si1
Phosphorus, P0.04
Carbon, C0.15-0.36
Sulfur, S0.03
Iron, FeBalance
 
Is it really worth the time / effort / money to polish this turd? 😐
Definitly!

Also, the edge failed at the geometry it was before. Thinning will make it weaker. Don’t expect it to suddenly become better.

Best option might be cloth backed sandpaper on a mousemat and convex it. Will get it looking ok fairly quickly and you can give it back and run away.
Good point! The demand for an stable edge saves time. And many cheap knives are not bad if sharpened.
 
Is it really worth the time / effort / money to polish this turd? 😐

Edit: looking up the steel they use I'd say that's a pretty clear no. Made of 420J steel. And they charge 200 bucks for a set of these...what a ripoff!

Chemical Composition​

The chemical composition of stainless steel grade 420J2 is outlined in the following table.

ElementContent (%)
Chromium, Cr14
Nickel, Ni (optional)1
Manganese, Mn1
Silicon, Si1
Phosphorus, P0.04
Carbon, C0.15-0.36
Sulfur, S0.03
Iron, FeBalance
So.... Basically cladding material for the edge? 🤦‍♂️
 
So.... Basically cladding material for the edge? 🤦‍♂️

Hey now. Some of Franklin's Mint's best um... collector knives are made out of 420! :p

OP, if you're set on working on it, I'd bread knife (saw) that edge on concrete until smooth and then create new edge bevels.
 
I'll give you a 3 step method.

1. Throw it in the trash.
2. Grab a beer.
3. Drink beer.
Above is still the best advice… Give the other guy two beers to console him for buying that hype marketed trash Kamikito and charge him a small waste removal and consoling fee directing him to a new knife that equals what he would of paid to have it sharpened.
 
Could also buy some 100 grit cubitron/3m pro sandpaper and mount it on a flat surface. Not worth giving it factory geometry if that’s what’s going to happen to it. But I also wouldn’t just breadknife away the chips and then cut in a 20 degree edge bevel… that’ll be an axe. Something in between.
 
Definitly!


Good point! The demand for an stable edge saves time. And many cheap knives are not bad if sharpened.
I mean just about anything can be sharpened as long as it’s steel - the customer hopefully would be satisfied with equal or slightly better than ootb, which means you could finish it on the sidewalk and call it a day.

I’d honestly grind out the chips, smooth out/hide the macrobevel, and be done with it. Thinning that sort of knife, while soft, usually means I have to put a lot of time into polishing than I would like. Unless you’re getting paid for hours of painstaking scratch removal of course, then go to town with the powders and polishing pads!

Edit: just seeing that thinning picture makes me twitch. The original finish is like highlighter on low spots.
 
Polishing something that soft shouldn’t take that long, fwiw. Obvs just give it like a 400 grit sandpaper finish, though. Hopefully you charged for more than just a usual sharpening job.
 
I would run that dog across the belt sander and be done with it in a hurry. The slack side so it made a convex edge, debur on a loaded strop and hand it back to them. They are using it to split kindling anyway might as well approximate an axe edge.
 
I just had a customer come in with a boxed set of 2 Kamikoto knives. Suspect the box had higher quality and finish certainly than the blade edges.

I just put aluminum oxide self-stick sandpaper on my diamond disks and went to town. Yeah, it took a lot of time to get those two knives back to near razor sharp, but the customer loved it and paid the $120 to get them back to reasonable shape.

I don't want to do that again.
 
Thanks for the advice, my approach was going to be

* Bread knife edge to even out.
* Thin a bit more and convex the edge a bit on sand paper.
* Remove scratches with sandpaper progression.
* Sharpen.
* Invoice for lots $ as it's such an expensive knife😂
* Never accept another Kamikoto for sharpening.
 
Take the knife to the nearest company that does commerical kitchen sharpening (here in Canada it's Nella) and have them sharpen it on power tools.

Eat or pocket the difference. Pass on sharpening the knife next time.
I am the local company that does commercial sharpening!
 
Is it really worth the time / effort / money to polish this turd? 😐

Edit: looking up the steel they use I'd say that's a pretty clear no. Made of 420J steel. And they charge 200 bucks for a set of these...what a ripoff!

Chemical Composition​

The chemical composition of stainless steel grade 420J2 is outlined in the following table.

ElementContent (%)
Chromium, Cr14
Nickel, Ni (optional)1
Manganese, Mn1
Silicon, Si1
Phosphorus, P0.04
Carbon, C0.15-0.36
Sulfur, S0.03
Iron, FeBalance
Wow that steel comp is really something. I can't believe they would choose that steel on purpose for making a cutting tool.
 
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