80 grit (used only for quick report-filing edges.
160 grit (setting the bevels)
400 grit (setting the apex on low quality knives and mainstream and quality mainstream knives
note: using higher then 600 grit CBN on shit steel doesn’t show any benefits to sharpness or edge retention.
1000 grit (used for setting the apex on high end steel and quality mainstream knives)
This is all based on Knife grinders research. And from what I’m experiencing so far, it’s working great.
As for finishing, it’s all about deburring properly. If you don’t get rid of that root burr, your knife won’t be sharp for long.
I’m keen to see what you come up with Jeff.
As to CBN or Diamond, it is decided for your application.
Tormek origional is with diamond wheels. I think that is because diamond wheels can be used for multiple application. But if the end user is specially for knife sharpening, better use CBN wheels. Because CBN is softer, when sharpening knives, it has better finishes than diamond. Becasue diamond leaves deeper scratches. Also CBN works better on HSS or hardened steel, most of knives are made of them.