Machining Dry Is Worth A Try : Modern .
And tool life may not even go down. Because coated carbide, ceramics, cermets, cubic boron nitride (CBN), and polycrystalline diamond (PCD) are all brittle, they are susceptible to the chipping and breaking caused by thermal stresses—especially those found in faceturning and milling operations—that can be aggravated by the introduction of coolant.