Question, premium CBN metallic, Poltava

Romans322

Romans322

Gold Member
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Oct 24, 2023
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42
Hi there,
Today I received in the mail from gritomatic 3 premium metallic bonded CBN stones (grits 120, 400, and 1000).
Poltava brand.

Before using the stones, I did a break in on each stone first like you would for a diamond stone to eliminate any loose particles.
I rubbed/scraped the stone surface in soapy water with an old large kitchen knife,

And then I sharpened one cheap pocket knife with the stones to test them out.
(On an edge pro apex sharpener)

And my main concern is the worn away appearance of the grit on the two coarser stones.

Will you please look at the pictures and tell me if they look like they have normal wear for sharpening one cheap pocket knife?
[I'm trying to figure out how to attach pictures of the stones, so maybe I can include them in the comments]

I've never owned stones like these before, so I don't know how they should look pertaining to grit-wear.

Thank you for sharing some of your valuable time with me.

All glory to the risen Lord Jesus Christ, and no glory to us whatsoever!


 
Romans322 said:
Hi there,
Today I received in the mail from gritomatic 3 premium metallic bonded CBN stones (grits 120, 400, and 1000).
Poltava brand.

Before using the stones, I did a break in on each stone first like you would for a diamond stone to eliminate any loose particles.
I rubbed/scraped the stone surface in soapy water with an old large kitchen knife,

And then I sharpened one cheap pocket knife with the stones to test them out.
(On an edge pro apex sharpener)

And my main concern is the worn away appearance of the grit on the two coarser stones.

Will you please look at the pictures and tell me if they look like they have normal wear for sharpening one cheap pocket knife?
[I'm trying to figure out how to attach pictures of the stones, so maybe I can include them in the comments]

I've never owned stones like these before, so I don't know how they should look pertaining to grit-wear.

Thank you for sharing some of your valuable time with me.

All glory to the risen Lord Jesus Christ, and no glory to us whatsoever!
Click to expand...
Thank you for sharing this video of the cbn stones.
I can't understand what he's saying, but my new stone's surface looks a lot like the stone's surface in that video.

I want to post pictures of my stones, but I can't find a way to post them on this site.

The only way I see possible is a little tab to click that let's you go to a social media site and link a picture from there.
But my knife sharpening group on Facebook is private, and when I tried to link a post of my stones from my Facebook group to here, the link wouldn't work/transfer to this site.

If I could post pictures directly from my device to this site (like Facebook or WordPress) I would eagerly post them, but I can't find a way to do that on this site.

Can you please help me understand how to post pictures from my device to this site?

Thank you for sharing some of your valuable time with me.
All glory to the risen Lord Jesus Christ, and no glory to us whatsoever!
 
If you buy a paid membership, you can post pictures directly. Without a paid membership, you must load your pictures on a photo hosting site, and then link to it. Facebook won't work because they block it. Imgur is a free site that is used a lot. There are others. In the tech support sub forum, you will find this thread on posting pictures.

O.B.
 
I stopped trying to judge my metallic-bonded stones by appearance. Just couldn't do it well. Instead, I run my finger over them and see whether the feel is right for a stone of that grit. When they get really smooth, it's time to expose new grit.

FWIW, I use electrolysis now, instead of messy ferric chloride, to expose new grit. I like it much better, not least because I don't have to go to such lengths to keep the corrosive stuff away from the aluminum mounting plate.

I recommend keeping your sharpening pressure light, to avoid premature wear. Let the abrasive do the work.
 
Old Biker said:
If you buy a paid membership, you can post pictures directly. Without a paid membership, you must load your pictures on a photo hosting site, and then link to it. Facebook won't work because they block it. Imgur is a free site that is used a lot. There are others. In the tech support sub forum, you will find this thread on posting pictures.

O.B.
Click to expand...
I see, thank you for informing me of that.
That explains it doesn't it?
People will invent ways to milk money from people.

Thank you for sharing some of your valuable time with me.
All glory to the risen Lord Jesus Christ, and no glory to us whatsoever!
 
UncleBoots said:
I stopped trying to judge my metallic-bonded stones by appearance. Just couldn't do it well. Instead, I run my finger over them and see whether the feel is right for a stone of that grit. When they get really smooth, it's time to expose new grit.

FWIW, I use electrolysis now, instead of messy ferric chloride, to expose new grit. I like it much better, not least because I don't have to go to such lengths to keep the corrosive stuff away from the aluminum mounting plate.

I recommend keeping your sharpening pressure light, to avoid premature wear. Let the abrasive do the work.
Click to expand...
Thank you for sharing some of your valuable time with me.
All glory to the risen Lord Jesus Christ, and no glory to us whatsoever!
 
Romans322 said:
I see, thank you for informing me of that.
That explains it doesn't it?
People will invent ways to milk money from people.

Thank you for sharing some of your valuable time with me.
All glory to the risen Lord Jesus Christ, and no glory to us whatsoever!
Click to expand...
It costs nothing to upload your photos to a free hosting site, and link them here. Except maybe some time spent learning the process.

O.B.
 
Tensaw said:
In the description of the Poltava stones on the Gritomatic site it's mentioned that CBN stones have tone imperfections and may darken due to oxidation.

Click to expand...
Yes sir, I'm familiar with that notification. The color isn't the primary matter that I'm wondering about, it's the missing grit particles.
There seems to be areas where there's full coverage of grit, and others where it appears to have little grit.
The coarser the stone, the more pronounced the matter is.

On the coarsest stone, it appears to have swaths of mostly missing grit. The swath's appearance reminds me of how timber looks when it's been cut with a circular saw blade.

But I've never used stones like these before, and maybe what I'm seeing is normal. (That's why I come to ya'll for answers who have more experience with these types of stones than I have). 🙂

Thank you for sharing some of your valuable time with me.
All glory to the risen Lord Jesus Christ, and no glory to us whatsoever!
 
4.jpg
 
If you also work with diamond or CBN paste on a metal grinding wheel, the surface will be even smoother
 
vlodko_lviv said:
If you also work with diamond or CBN paste on a metal grinding wheel, the surface will be even smoother
Click to expand...
Hi, I don't want them to be any smoother, I want them to cut metal more effectively. 🙂
Thank you for sharing some of your valuable time with me.

All glory to the risen Lord Jesus Christ, and no glory to us whatsoever!
 
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