On 2017-05-23 12:04 PM, Kirk Eppler wrote:
>> I got half,  one, and two micron. They don't seem to make a dent in an
>> >edged tool.
>> >
>> >What three grits would you choose ? Assuming you  know more about this
>> >than I do.
>> >
>> >If I am not mistaken, those are polishing grit numbers.
> My power sharpening rig has 1200 grit paper, which I think they claim is 6
> micron, which really just polishes.
>
> So yours are REALLY fine.

There are so many standards of grit it's almost impossible to discuss 
them without specifying a reference.

I'm not certain of this, but I don't believe you can directly compare 
the effects of high speed vs hand speed grinding or sanding with a 
particular grit. Size matters, but so does speed!

Finally, consider this sharpening schedule which uses 15, 5 and 0.5 
micron paper to form 3 microbevels.

http://www3.telus.net/BrentBeach/Sharpen/3m.html#my

IME, The two finer grits don't just polish, they hone very narrow 
microbevels. On a larger surface, it might just seem they were merely 
polishing.

FWIW
Don, taking a break from the garden





-- 
The harder they come, the bigger they fall - Ry Cooder