View Full Version : Whats a micron
12-05-2006, 03:04 PM
First, let me say that since joining this forum I have adjusted my views with regard to honing and stropping with remarkable results. Thanks
I once read in a thread here that compared microns to (K). I can't find it now. Can someone tell me how microns in diamond paste relate to (K).
= what in K
Thanks you guys are great
12-05-2006, 03:45 PM
:thumbup: glad i could help
12-05-2006, 03:49 PM
:thumbup: glad i could help
I seem to be missing the micron to K conversion. :wink:
Also, what the heck is K?
12-05-2006, 04:10 PM
12-05-2006, 05:31 PM
EDIT. My assumption that the grit # equaled particles/inch was wrong. Thus my calculations were wrong as well. The concept is similar, but not exactly that. Grit refers to the number of holes in a screen of a certain standard size (not sure what), that the grit will pass through. Obviously, more holes = smaller holes = finer. Problem is, this means it is difficult to convert accurately to a particle size. No, you can't just figure out the the standard size in mm, take the square root and go from there. That would work in theory, but in practice, there is the issue of the wire thickness of the mesh. More and more of the screen is going to be taken up by this as the mesh gets finer. So you would need to know the wire thickness as well, to create a formula, and it would be a bit complex, I fear.
Also, it seems, for obvious reasons, that grit cannot be actually measured by this method when finer than 240.
So.... Not sure how to get a good idea what the equivalents are. Looking for an online table somewhere....
Although, the cutting properties of loose powder are probably different than imbedded in a stone, so these may not be truly equivalent, anyway.
12-05-2006, 05:56 PM
Ah. I did find a table indicating that 1000 grit is about 7 microns, with a range from 2 to 23, and a caveat that you cannot assume that equivalent grits in the micro fine categories from different manufactures are the same.
But loosely, seems like 8k might be in the rough neighborhood of 1 micron.
I think we'd need to rely on actual experience of people who have used them to get a real sense what is equivalent in terms of actual use.
12-05-2006, 06:00 PM
I found what I was talking about
post by Joe Lerch
12-05-2006, 06:14 PM
Ah. Well. That about answers that. Interesting. And .25 = mighty darn fine. Does anybody use this? And what for?
12-05-2006, 07:00 PM
.25 micron produces an extremely smooth edge, but it's a little weak - the smaller particles produce smaller grooves which produce smaller, thinner serrations which are weaker. .5 micron is where most guys seem to stop.
.25 isn't the finest you can go, btw. There's at least one vendor out there selling .1 micron diamond paste, and even finer stuff may well be available.
Some of the variation of grit measurements is because the particles aren't completely uniform in size. For example the stated size could (a) be the *average* particle size, or it could be the *maximum* particle size. And different substances may produce different cutting actions which can affect the effective grit size. For example, a 3 micron belgian coticule may produce an edge comparable to 1.8 micron boron carbide, which may produce an edge comparable to a 1 micron diamond.
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