Ken Schwartz : honing compounds
Posted by CliffStamp
|
Ken Schwartz : honing compounds July 02, 2013 05:42PM |
Ken Schwartz : [precisesharpening.blogspot.ca]
I recieved :
-3-5 micron, polycrystaline diamond
-1-3 micron, cubic boron nitride
-0-2 micron, cubic boron nitride
I had two knives :
-Gavko EDC, S125V, 63 HRC, Peters
-Air, CPM M4, 62-64 HRC, Spyderco
The Air was quite blunt :
-destress the edge
-reform the edge on a 1k waterstone (king), 225 pps
-cuts well
-refine on a 3k waterstone, henckels, 50 pps
-stone feels very slippery, does not cut well at all
Here is where it became interesting, the 8k stone would not cut the Air at all previously :
That is one very light spray but it changes how the stone acts :
Now to be very clear, an 8k stone is between 1-3 microns (the stones are not well graded and some standards use JIS some use mesh no one really says what unless you get high grade stones) and since the abrasive breaks down in use the cutting action is even slower. A knife also has to be sharp before you can take it to these stones so it should be cutting newsprint easily.
After 50 pps (this has a wide edge bevel, 1/4" and I was working the entire bevel) the stone was definitely cutting and a quick check and the edge would do all kinds of silly things :
-shave hair above the skin
-push cut newsprint well beyond 2" from the point of hold
I was also doing this not at all seriously I was watching the IMAX version of T2 because a friend of mine gave it to me as a joke-gift when I made a disparaging comment about lack of acting in female leads.
I then used Mike's knife, same thing, and very quickly the knife was similar, but slightly reduced :
-push cut newsprint well beyond 1" from the point of hold
But I would not expect it to respond as fast because :
-I had been using the edge and did not reset it
-it has a much lower grindability
Still it was pretty trivial and this is a decent level of sharpness.
Now there is an alternative, that this is just bais/placebo and I would want to do more checks to verify. The edge certainly looks very different than an 8k stone :
This could be though the result of leaving coarse scratches from previous finishes (that is the Air) as I went though them very fast. Next time I will take shots through each stage.
However at a minimum I will conclude that it is interesting enough to give a further look.
I recieved :
-3-5 micron, polycrystaline diamond
-1-3 micron, cubic boron nitride
-0-2 micron, cubic boron nitride
I had two knives :
-Gavko EDC, S125V, 63 HRC, Peters
-Air, CPM M4, 62-64 HRC, Spyderco
The Air was quite blunt :
-destress the edge
-reform the edge on a 1k waterstone (king), 225 pps
-cuts well
-refine on a 3k waterstone, henckels, 50 pps
-stone feels very slippery, does not cut well at all
Here is where it became interesting, the 8k stone would not cut the Air at all previously :
That is one very light spray but it changes how the stone acts :
Now to be very clear, an 8k stone is between 1-3 microns (the stones are not well graded and some standards use JIS some use mesh no one really says what unless you get high grade stones) and since the abrasive breaks down in use the cutting action is even slower. A knife also has to be sharp before you can take it to these stones so it should be cutting newsprint easily.
After 50 pps (this has a wide edge bevel, 1/4" and I was working the entire bevel) the stone was definitely cutting and a quick check and the edge would do all kinds of silly things :
-shave hair above the skin
-push cut newsprint well beyond 2" from the point of hold
I was also doing this not at all seriously I was watching the IMAX version of T2 because a friend of mine gave it to me as a joke-gift when I made a disparaging comment about lack of acting in female leads.
I then used Mike's knife, same thing, and very quickly the knife was similar, but slightly reduced :
-push cut newsprint well beyond 1" from the point of hold
But I would not expect it to respond as fast because :
-I had been using the edge and did not reset it
-it has a much lower grindability
Still it was pretty trivial and this is a decent level of sharpness.
Now there is an alternative, that this is just bais/placebo and I would want to do more checks to verify. The edge certainly looks very different than an 8k stone :
This could be though the result of leaving coarse scratches from previous finishes (that is the Air) as I went though them very fast. Next time I will take shots through each stage.
However at a minimum I will conclude that it is interesting enough to give a further look.
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