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I have been looking around the forum for a chart that can tell you the grit equivalence in microns. In other words I would like to see what a paste in microns would equal in sanding grit or vice a versa.
I'm just trying to figure out the honing/paste process and which grit/paste goes in what order.
Lynn answered one question saying that 0.5 microns is about 30k.
Thanks in advance.
It's here:
Formulae For Converting Between Grit and Microns - Straight Razor Place Wiki
You'll need a scientific calculator to use the formula. I can walk you through the keystrokes if you're unfamiliar with using the log functions.
Thank you very much for the link. Thanks on the logs but I'll pass. I might just break out my slide rule for old time sake! :beer2:Quote:
Originally Posted by roughkype
OK, have fun. Slide rules are the straight razors of math.
Since I last posted, I worked out an Excel spreadsheet that will do the microns to grit and grit to microns conversions. PM me an e-mail address if you want it and I'll send it to you.
I got this one from a member a couple of years back. It is pretty close.
Estimated Microns = 14755 / Grit
The Wiki is right on but my brain just can't engage sometimes enough to use it.
Take Care,
Richard
The Wiki is completely unintelligible unless one has a background in statistical estimation (which I do).Quote:
Originally Posted by riooso
And with that background, it doesn't make sense! The exponent β1 should be -1.000. That is, "grit" is inversely related to "microns". If β1 is _different_ from "-1", there's a problem with the data used to estimate it !
Also, the confidence intervals are quite broad, indicating a lot of "noise" in the data used for estimation.
The short formula above has the right exponent, and makes a heck of a lot more sense. I'll change it to:
Microns = 15,000 / Grit
for my own use.
Thank you!
Charles
PS -- there are roughly 25,000 microns to one inch. Based on the simple formula, I suppose that a "1 grit" particle would be about 5/8" in diameter. Not a ridiculous estimate.