Abstract
Micro ball endmill with a tool tip radius of 50 μm was formed using binderless poiy crystalline diamond (PCD) and binderless cBN as tool materials. Which is similar to that of single crystal diamond tool, smooth and sharp cutting edges without micro chips could be formed. Cutting test revealed that binderless PCD was effective for the interrupted cutting of hard and brittle materials such as glass-like carbon and cemented carbide.
