The ideal cutting fluid for low speed machining of metals

1. removes the heat faster from the cutting zone
2. forms a coating on the cutting tools by Chemical reaction
3. forms a low shear strength film of work material at the tool chip interface
4. serves as a dielectric, minimizing thereby reactions due to EMF at the interface

Function of cutting fluid
(1) Cooling
(2) Lubrication
(3) Cleaning
(4) Save from external contamination.