Crossover numbers for Edge Pro stone grits

J

JLKII

Joined
Jun 4, 2009
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From an email with the owner of Edge Pro, when I asked about the grits of his stones compared to Japanese waterstones

We have new crossover numbers to compare our stone's grit ratings with others that are much more accurate than previously.

I just tested a set of Shapton Stones that were made for the Edge Pro. The 2000 was the same as our 320, the 5000 was the same as the 600, the 8000 was just a little coarser then the 1000 so I put the 1000 at 10,000, then the 15000 was exactly the same as our 1200.

Pretty amazing, don't you think ! I sent the stones out to two of my customers, that are commercial sharpeners and we all agreed on the cross-over and we also agreed that none of the Shapton Stones cut a nice or finished as smooth as the Edge Pro Stones, more amazing!

My comment: the 1200 grit is new and is not yet listed on the website, but can be ordered over the phone at (541) 387-2222. The full-sized stone is about $15.
 
? His stones are polishing stones manufactured by Boride Abrasives. I'm pretty sure they use a widely accepted grit standardization to sort their stones while Shapton uses who knows what (Japanese standard?). Are you advertising for him- why the phone number?

Good to know I guess. Although $15 for a mass produced polishing stone glued to a slightly modified piece of aluminum bar stock isn't exactly a deal to me anymore.
 
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BladeChemist said:
? Are you advertising for him- why the phone number?
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Other than using an Edge Pro Apex for some years now, I have no affilation with him.

I thought that some readers who used his products might like to know about the finer grit stones.

I posted a phone number because one of my pet peeves about the Internet is posters who make comments but don't give sources so that the reader has to take the time to find them.
 
JLKII said:
Other than using an Edge Pro Apex for some years now, I have no affilation with him.

I thought that some readers who used his products might like to know about the finer grit stones.

I posted a phone number because one of my pet peeves about the Internet is posters who make comments but don't give sources so that the reader has to take the time to find them.
Click to expand...

Okay. Although most users of the E.P. are already aware of Ben's website and know how to contact him. Might I suggest, in addition to posting a phone number, also post a link to the website. Much easier reference to follow being this is a web browser.

Despite my complaints on pricing I'm still probably going to get one of the 1200 grit stones from Ben as the only alternative is buying a minimum of 12 stones from Boride.
 
BladeChemist said:
? His stones are polishing stones manufactured by Boride Abrasives. I'm pretty sure they use a widely accepted grit standardization to sort their stones while Shapton uses who knows what (Japanese standard?).
Click to expand...
Here's what Boride says
The stones used by Edge Pro are: AS-9 (orange/brown color), AM-K (white), and CS-HD (green silicon carbide). The grit standard used is FEPA.
Click to expand...
and some grit comparison charts
http://sharpeningmadeeasy.com/grits.htm
http://members.cox.net/~yuzuha/jisgrit1.html

Boride/Congress Tool offer a ton of stone options, so you can custom make a lot of different ones. Just gotta find some appropriately sized aluminum strip stock to cut blanks.
 
JLKII said:
From an email with the owner of Edge Pro, when I asked about the grits of his stones compared to Japanese waterstones

We have new crossover numbers to compare our stone's grit ratings with others that are much more accurate than previously.

I just tested a set of Shapton Stones that were made for the Edge Pro. The 2000 was the same as our 320, the 5000 was the same as the 600, the 8000 was just a little coarser then the 1000 so I put the 1000 at 10,000, then the 15000 was exactly the same as our 1200.

Pretty amazing, don't you think ! I sent the stones out to two of my customers, that are commercial sharpeners and we all agreed on the cross-over and we also agreed that none of the Shapton Stones cut a nice or finished as smooth as the Edge Pro Stones, more amazing!

My comment: the 1200 grit is new and is not yet listed on the website, but can be ordered over the phone at (541) 387-2222. The full-sized stone is about $15.
Click to expand...

I'd love to see comparative pictures on this subject. The results just dont seem right at first glance. Anyone know of a good post that does this w/ pictures?

I have Shapton Glass stones as well as Boride ones. My 8000 polishes way better than my 1200 Boride.

There might be more to this though. A more in depth test may be in order.
 
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Ankerson said:
I was thinking I should beable to jump from the 1200 grit stone to the 6000 grit tape instead of using the 2000 grit tapes.
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I'm thinking similarly- it will allow me to permanently cut out some of the lapping tapes in my process

hardheart said:
Here's what Boride says

and some grit comparison charts
http://sharpeningmadeeasy.com/grits.htm
http://members.cox.net/~yuzuha/jisgrit1.html

Boride/Congress Tool offer a ton of stone options, so you can custom make a lot of different ones. Just gotta find some appropriately sized aluminum strip stock to cut blanks.
Click to expand...

Thanks much for the condensed information! :thumbup::thumbup::thumbup:

changeofseasons said:
I'd love to see comparative pictures on this subject. The results just dont seem right at first glance. Anyone know of a good post that does this w/ pictures?

I have Shapton Glass stones as well as Boride ones. My 8000 polishes way better than my 1200 Boride.

There might be more to this though. A more in depth test may be in order.
Click to expand...

Are you using some of the Shapton glass stones for the E.P.? I would be very interested in hearing more about them from you.
 
agreed with change of season, i have shapton pro 1 and 5k, naniwa 3, 5 and 10k at home and the equivalences are waaaaaay of ... sorry. i wonder how mr dale compared... but i've sharpened freehand, side by side, a very wide beveled chisel ground japanese higonokami on all the stones listed to get a better idea of the scratch patterns (wide bevels helps for that).for me the 320 is closer to 800 JIS, 600 about 2k JIS and 1000 about 5k JIS... makes sense, if the 1000 ep was 10k JIS (1micron) there would be no need for the 2k tape before the 0,5mic 6k tape.
 
BladeChemist said:
I'm thinking similarly- it will allow me to permanently cut out some of the lapping tapes in my process
Click to expand...

Yeah the 1000 grit really will put a nice shine on the edge already, most of the time I can see myself in the edge so the 1200 should really make a difference there.

Time will tell though, I should have mine tomorrow I think.
 
BladeChemist said:
Are you using some of the Shapton glass stones for the E.P.? I would be very interested in hearing more about them from you.
Click to expand...

I don't use Shapton Glass stones on the EP. I use them freehand or in a different guided system that I've made. My preference is to use full size stones. The wider the better. This is a subject for another thread though.
 
I couldn't tell much difference between the 1000 and 1200. Actually I think the 1000 seemed to polish better! Not sure why.
 
I've had the 1200 stone for a while, just an FYI, when I first got it, it didn't polish well at all, like changeofseasons said, it was worse than the 800. Lapping it fixed the problem... when I started lapping it, it actually looked like it had a "crust" on it (for lack of a better word), when that was lapped off it worked great. Didn't take much... I could see the difference (it was a little different color) and could tell when it was done.

cbw
 
cbwx34 said:
I've had the 1200 stone for a while, just an FYI, when I first got it, it didn't polish well at all, like changeofseasons said, it was worse than the 800. Lapping it fixed the problem... when I started lapping it, it actually looked like it had a "crust" on it (for lack of a better word), when that was lapped off it worked great. Didn't take much... I could see the difference (it was a little different color) and could tell when it was done.

cbw
Click to expand...

I have mine, but I haven't used it yet. :D

I will lap it the next time I flatten my stones then start using it.
 
Lapped mine today and there is a noticable difference between the 1000 and 1200 grit stones.

I was able to go from 1200 grit stone to the 6000 grit tape with no problem.

The 1200 grit stone cuts pretty fast too and it polishes the edge up very well.
 
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