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 Post subject: Re: The Grand Unified Grit Chart
PostPosted: Sat May 24, 2014 6:47 am 
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Joined: Mon May 19, 2014 1:52 am
Posts: 355
Location: Philly
Cool chart. Any chance of getting the popular oil stones and Arkansas stones added to the list and a spreadsheet or pdf download?



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 Post subject: Re: The Grand Unified Grit Chart
PostPosted: Wed Jun 04, 2014 4:45 pm 

Joined: Sun Aug 26, 2012 5:24 am
Posts: 374
The chart isn't working!


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 Post subject: Re: The Grand Unified Grit Chart
PostPosted: Wed Jun 18, 2014 6:01 pm 

Joined: Wed Dec 05, 2012 4:00 pm
Posts: 60
pjwoolw reposted it in this post --

Image


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 Post subject: Re: The Grand Unified Grit Chart
PostPosted: Wed Jun 18, 2014 7:02 pm 

Joined: Sun Aug 26, 2012 5:24 am
Posts: 374
Thanks Mark and Pete!


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 Post subject: Re: The Grand Unified Grit Chart
PostPosted: Wed Jun 18, 2014 10:15 pm 
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Joined: Mon May 19, 2014 1:52 am
Posts: 355
Location: Philly
May want to attach it to the forum so its hosted here and not some place where it can disappear. Every forum that was using it was just pointing to it so when it went away it went away from everywhere.



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 Post subject: Re: The Grand Unified Grit Chart
PostPosted: Sun Aug 10, 2014 11:53 pm 

Joined: Tue Jul 15, 2014 4:52 am
Posts: 129
Location: Auckland, New Zealand
From research done on another thread I can confirm the following from Boride Abrasives regarding the stock EP stones;

"Yes, Boride’s stones conform to the FEPA-F standard.

Average Particle Size
1000 Grit – 5 microns
1200 Grit – 3 microns

Please let me know if you need additional information and I will be happy to help"

I'm happy to forward the email to whoever if that would be helpful

Thanks



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 Post subject: Re: The Grand Unified Grit Chart
PostPosted: Wed Sep 17, 2014 8:01 pm 

Joined: Sat Sep 13, 2014 3:46 pm
Posts: 3
I'm not sure I'm reading & interpolating this chart correctly, perhaps someone with more experience can help. Does this chart identify the Shapton 1000 grit/micron between an interpolated 700-800 Chosera stone? Is the Shapton 4000 grit/micron just slightly less than a Chosera 3000 stone and the 6000 Shapton slightly less than the 5000 Chosera?


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 Post subject: Re: The Grand Unified Grit Chart
PostPosted: Wed Sep 17, 2014 8:09 pm 
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Joined: Tue Feb 05, 2013 6:00 pm
Posts: 2473
You got it! I personally take this chart as an approximation for most values, not a thoroughly scientifically researched, totally objective reference. It provides a good basis for comparison, though, between some popular stone lines.


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 Post subject: Re: The Grand Unified Grit Chart
PostPosted: Wed Oct 08, 2014 10:38 pm 

Joined: Wed Oct 08, 2014 9:22 pm
Posts: 2
ragman wrote:I'm not sure I'm reading & interpolating this chart correctly, perhaps someone with more experience can help. Does this chart identify the Shapton 1000 grit/micron between an interpolated 700-800 Chosera stone? Is the Shapton 4000 grit/micron just slightly less than a Chosera 3000 stone and the 6000 Shapton slightly less than the 5000 Chosera?


Good question....
One difficult to measure metric is the distance between the tips of grit
as they present themselves to steel. I have never seen anyone address
this with the exception of some scratch pattern folk.

Tiny grit can be packed shoulder to shoulder or dispersed two or three
or more grit diameters apart in the matrix. A very dense hone can
thus cut 'finer' than the grit diameter might indicate.

Back to scratch, there is distance between scratches and depth of the scratches.
The maximum depth is mostly a force thing so doubling the number of grains
per square unit reduces the force per grit point by about four. So a denser
hone formula can have more and shallower scratches when used the same way.

Grit dimension is important with a slurry. The grit tumbles on the matrix of
the hone in contrast to just peaking up and depending on dilution and wear of the
grit cuts differently.

And thanks for the charts. Good stuff.


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 Post subject: Re: The Grand Unified Grit Chart
PostPosted: Fri Nov 21, 2014 4:59 pm 

Joined: Tue Nov 11, 2014 11:17 pm
Posts: 21
Thank you for the very useful chart.

Could you also estimate where on the chart the Black, White, Green and Red bar strop compounds would fall on this chart?

Thank you.


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