CUTTING PROCESS produces enormous heat and chips. The heat is generated due to the PLASTIC deformation of the chips, friction between the rake face and chips, and the friction between the clearance face and the workpiece.The function of the cutting FLUID is:To lubricate the contact at the tool and the workpiece and at the tool and chip, thus reducing friction and welding between the contact surfaces.To dissipate the heat generated during the cutting process in order to KEEP the tool and workpiece cool.To wash away the chips from the cutting zone.To improve the surface finish and to reduce the cutting force.