sal wrote: ↑
Tue Dec 10, 2019 7:51 pm
It's a fine piece.
Hey Shawn, Do you personally prefer CBN to Diamond?
Yes, but seems to be difficult to pin point since there are dozens of different grades of both diamond and CBN with different geometry; cutting facets and various levels of cutting aggression, friability and grain toughness.
So how do we know we are comparing diamond to CBN and not grades at opposite ends of the spectrum and selecting the grade that fits the role better?
I have been surprised at the differences between them and thats not including the bond type, hardness, etc.
Seemingly endless combinations.
I felt CBN was superior in that it seemed to posses all the abrasive firepower needed (4500-5000hv) without chewing up the steel (matrix 600-1000hv, MC type 2800-3000hv) as much and was more compatible with the bonding I like. I felt it was higher quality and left a better surface roughness for the given grit and bond compared to the diamond grades I had access to. A huge problem with CBN is the cost. It is significantly more expensive than the diamond but I'm not interested in watering down the product if I feel something has more performance.
There are plenty of cheaper alternatives for folks but very very few exotic, high end options for folks that are more advanced and discerning that want the cutting speed and feedback at high levels realitive to surface roughness.
So cost be damned, CBN it shall be.
I have played with some other folks bonded stones that use diamond and have been satisfied with those stones as well for what they are. So it's seems difficult to see vast differences between CBN and Diamond especially since it's very difficult to rule out differences that aren't just the bonding let alone all the various grades of diamond and CBN which I feel are more important.
So perhaps I can only speak from the design of my stone rather than a blanket statement in general.
It seems to be like the steel in the knife in that it's the sum of all parts rather than a single component alone.