Everyone knows that the type of coating for a job is the most important thing to consider. Right?
Obviously, using a diamond type of coated tool on a steel part is a bad idea, as the carbon from the diamond will readily dissolve into the steel. So in the case of chemical incompatibility / misapplication, I guess what everybody knows is correct.
But after listening to George Korenyi-Both of Dayton Coating Technologies, I found myself agreeing with his 3 factors to understanding tool coatings.

Just remember ATM!
Just remember ATM!

According to George, the three factors are Adhesion, Thickness and Morphology.

  • The Adhesion of the coating is 10,000 times more important than the type of coating, according to George.
  • The Thickness of the coating is 1000 times more important than the type of coating.
  • The Morphology of the coating is responsible for about 10 times the advantage over the type of coating.

What good is a high tech coating to your job if it won’t stay on the tool when you need it?
If it isn’t thick enough to be effective?
At that point, does it really matter what type of coating it is? Or what its structure is?

ATM, Thanks George.
ATM, Thanks George.

My apologies for the scanning lines folks. Click the link below for the video.

In most of this footage you will see that there is a small mass of workpiece material (Built Up Edge or BUE) that is doing the “penetration.”


The fracturing ahead of the tool, and the occassional jamming of material under the tool, and the waviness of the generated surface are concepts to keep in mind when you try to understand why you are getting the finish on the surface that you get.

Also, a good way to visualize how the material is being workhardened by “rubbing” where the material is not separating easily ahead of the tool.

What you are seeing.