Results 1 to 6 of 6
Thread: X Microns = Y Grit ?

01092011, 02:26 AM #1
X Microns = Y Grit ?
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.Last edited by Zorro; 01092011 at 02:30 AM.
Testing

01092011, 02:59 AM #2
 Join Date
 Oct 2010
 Location
 Durango, Colorado
 Posts
 2,080
 Blog Entries
 2
Thanked: 443It'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."These aren't the droids you're looking for." "These aren't the droids we're looking for." "He can go about his business." "You can go about your business."

The Following User Says Thank You to roughkype For This Useful Post:
Zorro (01092011)

01092011, 03:06 AM #3

01092011, 06:00 AM #4
 Join Date
 Oct 2010
 Location
 Durango, Colorado
 Posts
 2,080
 Blog Entries
 2
Thanked: 443OK, 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 email address if you want it and I'll send it to you."These aren't the droids you're looking for." "These aren't the droids we're looking for." "He can go about his business." "You can go about your business."

01092011, 06:18 AM #5
 Join Date
 Jan 2008
 Location
 Northern California
 Posts
 1,301
Thanked: 267I 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

01092011, 08:07 AM #6
 Join Date
 Aug 2010
 Location
 Vancouver, BC, Canada
 Posts
 1,377
Thanked: 275The Wiki is completely unintelligible unless one has a background in statistical estimation (which I do).
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.