Are you talking about the electric WSKO? If so, it puts a very sharp convex edge on blades. You probably just need to practice with it more. I have the BGA - Blade Grinding Attachment with mine. I don't like using the WSKO the regular way, I only like using it with the BGA. And I pretty much only use it for kitchen knives and small steel parts that I need to modify and polish. I don't use it on my knives because I want flat grind edges on them in case I'm away from home and need to freehand sharpen them with a stone.