Stone that works as fast as a belt grinder?

O

Omega Leather Works

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Jun 13, 2007
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Hey guys, sorry for the cheesy sounding thread, here's the scoop.

A while back I was looking through stones, I want to say on Amazon, but it could have been Chefs knives to go too... Not sure.

Anyway, the stone that I was looking at had rave reviews All claiming that the stone was incredibly aggressive. A lot of people likened the stone to a belt grinder, only without the heat.

I've searched a million times and can't find it again.

Anyone have any ideas on what I may have been looking at? I need to look into the product some more.

Thanks!
 
www. chefknivestogo .com/nuume25gr.html
24 grit nubatama? Take the spaces out...not sure how to post a link that's not actually hyperlinked.
 
Last edited:
www.chefknivestogo.com/nuume25gr.html

noparse in the tags does it :) Or you can untick the "Automatically parse links" box in additional options.
 
That's a seriously aggressive stone. Would be great if you had to work out chips or dents by hand.
 
Another stone that's rather belt sander-like is the DMT XXC. I haven't used the Nubatama 24, but the XXC seems pretty aggressive. I've taken out chips 1/8" deep with it and restored broken off tips. It works very fast, so you can see your results as you grind. But you control the grinding so it's easy to check your progress as you go.

That said, for more serious grinding a real belt grinder is much much faster than doing it by hand. I was once given a kitchen knife to sharpen that had been extremely, extremely abused. Someone had slammed the heel of the blade, hard, into a big can of tomatoes, trying to make a vent hole so it would pour easily once opened at the other end. Instead of creating a vent, it bent the heel of the knife WAY over in an area 3/4 to 1.25" wide. It had also repeatedly been pulled through a carbide sharpener and had a recurve about 2.5" up from the handle. Oh and the spine had been whacked on something sharp as there were cuts/dents in several places on the spine.

For that job a belt sander would probably have made short work. Probably no more than 10 to 15 minutes of careful work. Though I haven't used a belt sander on knives ever so maybe I'm estimating wrong. What I *am* sure of, is that it took me about 1.5 hours to repair the damage. I used a file for most of the bulk removal, and then a stone for some of the stuff where I didn't want file marks to show. It was finished in the normal way after that massive damage was removed.

The file was extremely effective and pretty fast. Good to have in your sharpening/repair tool box. I'd like to have one of those Nubatama 24 grit stones too though. :)

Brian.
 
bgentry said:
Another stone that's rather belt sander-like is the DMT XXC. I haven't used the Nubatama 24, but the XXC seems pretty aggressive. I've taken out chips 1/8" deep with it and restored broken off tips. It works very fast, so you can see your results as you grind. But you control the grinding so it's easy to check your progress as you go.
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+ 1 for what Brian said. With the XXC DMT stone, you can use it like a normal stone, or use it like a file and control how fast or how much you grind off of your blade. No worries about over heating the blade edge this way. Eye balling the angle is probably close enough with your experience on what a grind angle should look like.
Check out knife works prices on their DMT stones. I just ordered three DMT stones from them yesterday. I got the course, fine, and extra fine. Started to get the XXC, but decided I really did not need one that coarse for my limited use and experimentation. Good luck on whatever route you go. Your knife is looking good by the way.

Blessings,

Omar
 
I went and looked at the nubatama right after I hit the post button for this thread. I don't think that was it, but I believe it was something very similar at a comparable grit. I really think it was at Amazon, but I'm having trouble with the search criteria.

Regardless, does anyone have experience with both the stone, and the DMT plate? I like that I could get a plate because I could also use it with the edge pro (clone), but I'm not sure that diamonds are what I need. I'm not sharpening or reprofiling, but flat grinding hardened blades.
 
if you are thinning a blade flat on the stone i'd recommend a waterstone. several reasons :

-it'll be a long and tiring job, controlling pressure on the diamond plate to avoid stripping diamond will shortly be challenging
-you can bear down on the stone as you dont care about burr formation, this will speed the process considerably.
-the waterstone will have a better feedback.
-the mud from the waterstone will hide irregularities better and speed up polishing process later

from the top of my head. maybe there are other reason, maybe you'll find more reasons to go for the plate ...

another pricy idea if you dont want a belt sander would be the japanese powered round stones, where the stone is held horizontal on a spinning disk with water pouring on it. dont remember the name of it but i've been tempted by this thing for years.
 
I used a DMT XC to flat grind a blade, and it stripped a lot of the diamonds off my plate. That was just one small blade, and I didn't even get completely finished. I don't have experience with the XXC though.
 
A DMT XXC is slow compared to a good waterstone. For flat grinding a blade though a belt sanders wins and regardless of the stone it would take a very long time to accomplish what you are asking by hand.
 
knifenut1013 said:
A DMT XXC is slow compared to a good waterstone.
Click to expand...

Really?!? I guess that makes some sense, since I've seen Murray Carter grind out some fairly large chips using just his 1000 grit waterstone, which seems like it would take far longer with an equivalent diamond plate or SiC stone.

I took your recommendation on the Nubatama stones. It took me over 2 weeks to finally do it, but I ordered the 150 and 5k bamboo and the 1k Ume. Just got them an hour ago so I haven't used them yet. Do you think the 150 bamboo is faster than the XXC DMT? If so I need to be careful with it!

Sorry for the thread hijack. I'll probably start a new thread once I've used my Nubatama stones some.

Brian.
 
All the coarse Nubatama stones are a bit different, it should be faster but it might not be. My 180 bamboo was similar but the 220 pink brick is faster than both, weird...

The 120 bamboo is one of the fastest stones I have ever used, probably twice the speed of a XXC but should only be used on single bevel traditional knives otherwise it dishes as fast as it cuts.
 
I've used SIC stones to flat grind, not something I want to do again with any media unless it's powered.
 
You know, I may just try paper. I'm going to see what the most aggressive wet/dry is and see if I can find some. I'm just so confused about what to do I'll just start with the basics.

Btw, there's no such thing as jacking one of my threads. I'm cool with whatever anyone wants to say or ask. ;)
 
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