Abrasives in Micron Scale (GLGC) revision 9

M

Mr.Wizard

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Feb 28, 2015
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My Grand Logarithmic Grit Chart has been updated to revision 9. Importantly this revision corrects my previous error of separating ANSI and CAMI standards. CAMI was the former ANSI sub-authority before UAMA, and these standards in essence represent the same grains measured by different methods.

http://myplace.frontier.com/~mr.wizard/GLGC/

Please see the README for details and please respect the license therein. The chart is free to access but not to distribute. The current version is always named GLGC.png; the previous version is in the same directory named accordingly.

Feedback and questions are always welcome.

My ISP is changing hands and I have been told to expect spotty service until April. If you get a "403 Forbidden" error on the directory or any of the files reload the page using Shift+F5, several times if needed, and it should load. Sorry for the trouble.
 
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I'm getting "Forbidden" when using your link.
 
Nuts! (Not again.) Thank you for letting me know.
I got a 403 error now too, but reloading a few times fixed it. I am suspecting some kind of throttling. I'll have to contact my ISP and see what they have to say.
 
FortyTwoBlades FortyTwoBlades The grid lines seemed "congested" as the chart became larger, but removing them entirely made it too hard to read an approximate value. The gradients seemed a little cleaner and easier on my eyes while still providing some reference across the columns. One loses the ability to read a precise micron value but I am not sure how useful that ultimately is. Which do you prefer?
 
Thx Mr.Wizard, reloading worked. You spent time reading any of Edward Tuffte's books? Your work suggests you might have already enjoyed them.

Seems like all these standards referenced with each other would give approximations. Thats fine for helping understand my sharpening. An example is Venev old formula bonded diamond at 60 grit, I recorded ~225µ from Gritomatic page, and 240 grit SIC reported by Congress at 240µ. As new stones I felt Venev was finer then Congress SIC. Once they broke in the difference was not discernible.
I'm not all the way through readme, but here is a start-
My eyes don't know what to do with the doubling vertical dashed black and orange lines. Contrasting color is to much for rest of chart as tone.
Spyderco now referenced with Norton, when Sal reports as mesh.
Different horizontal gradient color shades would let my eyes "land", and also demark.
 
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scottc3 scottc3 I haven't read Edward Tuffte's works but I've heard the name. I'll take your comment as recommendation and seek them out. Do I correctly understand the second part of your comment as support for the gradient-bands background style, or do you mean something else?
 
I'd say the second is easier to read, but the gradients do make it seem as though their positions indicate something else, so confusing in that aspect only. :)
 
You will enjoy him, I'm as sure as when I gifted them to a life long buddy who designed houses for a living for his 50th bd. Libraries have them.
Yes, a place to rest my eyes upon the horizontal relationships.
Also maybe horizontal stabs projecting out a bit from both sides of a vertical for particle doubling range?
Gish, I was comparing Girtomatic page to new rev. I'll look at old rev next.
 
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