Mon Sep 30, 2013 8:14 am
Mon Sep 30, 2013 8:18 am
Mon Sep 30, 2013 9:12 am
Mon Sep 30, 2013 9:24 am
Mon Sep 30, 2013 10:18 am
Knife Fanatic wrote:If we are getting into the straight razor world, following .25 micron with some .10 micron on nano cloth will make a difference, but for kitchen knives it's a bit ludicrous IMO. (I just re-read and saw that you ARE using this for a straight razor, so edit:) I personally do .25 micron on balsa, then .10 micron on nano cloth. If you want to finish with .25 micron you can, just remember to follow it with plain leather. Plain leather is going to be much finer than .25 on balsa. If you decide to go the .10 micron nano route, you can shave straight off that edge without leather, maybe strop it on your hand if you want.
For some silly reason I love to skip 1 micron (16k) altogether unless it is being used as my finisher for a toothy edge (aka 2k or 4k stone edge, then strop on 1 micron). Normally, if I'm going after a high refinement like that I will go from 8k stone edge straight to .5 micron strop, then .25 and .10.
Not sure what it is, but I never really benefit as much when I go from 8k stone to 1 micron strop; Not that it doesn't help, but the jump is rather small and a great 8k is already something to behold.
What is the finest stone you are using before getting into your stropping progression? I will back away as I'm sure I am about to get schooled by a couple of people on honing razors. I do okay, but I know Michiel, Jens, and Ken can probably teach me a thing or 2.
Mon Sep 30, 2013 10:50 am
Tue Oct 01, 2013 4:17 am
Tue Oct 01, 2013 7:24 am
ken123 wrote:Well it's a bit more complicated It always is ...
So there are fine silicates in leather. The Kangaroo is finer than horse or cow, so in terms of a final strop, a kangaroo strop is the finest strop in terms of abrasives present in a strop. But the abrasive is silicates, which are far less aggressive than CBN or Poly Diamond so there is an issue of the character of the abrasive, not just the grit.
Nanocloth has no grit. None. Nada. So it is, for the purposes of this discussion of infinitely fine grit. In fact if you strop on it with a metal razor you don't detect any metal swarf. Yet if you put even a light spray of the 0.025 poly - the finest abrasive available - you will get metal swarf removal. So this is the finest strop in terms of abrasive effect alone.
But leather has yet another characteristic - draw or pull. This acts somewhat as a burnishing component towards edge formation, unlike nanocloth. If you follow a strop with nanocloth or Kangaroo with compound less than tenth micron after using an unloaded kangaroo strop with a third strop with compound approximately tenth micron or finer, you will notice a marked improvement of the edge in short order. Read that last sentence again - it is a bit hard to follow. The rate of abrasion of these ultrafine compounds is both FAR finer and far faster than the effect you get from just the Kangaroo alone. For this reason I use a Kangaroo strop with 0.025 poly as my final touchup before shaving. Indeed you can perceive a difference in the draw of the razor on the 0.025 poly Kangaroo strop after just a few strokes. This is probably from removing some slight metal oxidation produced between uses of the razor - even after thorough drying.
Nanocloth has a far greater range than most people expect among the coarse grits. I successfully use nanocloth with grits as coarse as 80 micron CBN compounds. Purely from a perspective of function, nanocloth is the most versatile material around, giving you a pure compound effect from 80 microns down to 0.025 microns. For this reason, I rarely use balsa anymore.
Beyond 80 microns - e.g. at 200 and 300 microns, I suggest using a coarse stone which hold these hugh particles in place better than a conventional strop. Here consider the Nubatama stones below 150 grit for this function - particularly on abrasion resistant steels.
Tue Oct 01, 2013 8:12 am
Tue Oct 01, 2013 9:27 am