Re: Flat (usu) versus triangle (shinogi)
Wiley Horne--Glendora, CA
>Gordon,
Coupla points:
1. If you want to try Funahiro, consider the white steel, and use the stones you have now. They're not a second quality of chisel--they just use the traditional steel. The same guy forged them, and the Funahiro faithful like the straight high carbon steel A LOT. And you don't complicate your sharpening procedures, which is a big deal if you ask me. A major milestone is getting settled into a sharpening routine that is effortless for you, and a normal part of shop life.
2. What stones do you have now? If Shaptons, you may be OK anyway for sharpening the alloyed 'genju' steel. Shaptons will sharpen that steel, but IMO it takes longer than I want to wait to get the real edge. A2 is slow too, IMO, even though Shapton will sharpen it. The thing is, I'm an impatient sharpener. Want results now. So when A2 came into our world, I converted over to diamond paste. Also hollow grinding, which I highly recommend to everyone who will listen.
Simple answer to your question: I use 1/4-micron diamond paste for the final hone. If you want to add one diamond plate as a final hone, I would suggest 1/2-micron on a steel or cast iron plate. It has to be a pretty smooth plate for that fine a grit. Probably the ideal surface would be the shoe of a beater Stanley--just mount it upside down.
I use long-ago-bald Norton diamond stones as substrates for diamond paste--and I mean bald. They work great. But this brings up a point. These expensive embedded-diamond stones tend to disappoint folks (they did me) by giving up their bite way earlier than you're expecting--I think the blade just ploughs 'em out of the matrix. I suggest paste if you want to use diamond.
Wiley