1. CUTTING FLUIDS Lesson Objectives
Explain the function and importance of cutting fluids in metal-removal operations
Describe the characteristics and advantages of the most common types of cutting fluids
Select the proper cutting fluid to suit various metals and machining operations.

2. CUTTING FLUIDS OBJECTIVES
State the importance and function of cutting fluids.
Identify three types of cutting fluids and state the purpose of each
Identify cutting fluid application methods.
Lesson Objectives
Explain the function and importance of cutting fluids in metal-removal operations
Describe the characteristics and advantages of the most common types of cutting fluids
Select the proper cutting fluid to suit various metals and machining operations.

3. Cutting Fluid Functions
Lubrication
reduces heat-creating friction: improved chip flow.
1/3 of the generated heat can be reduced.
Cooling
removes heat from
1) the cutting tool
2) the chip
3) the work-piece

4. NONCUTTING FUNCTIONS Rust & Corrosion Prevention Non-flammability
protects the machine and machined parts
Non-flammability
preferably noncombustible and should not smoke excessively.
Bacterial Control
Bacteria will eventually destroy water-based cutting fluids. (And make it stink)

5. CUTTING FLUID BENEFITS
Increased Productivity
Reduced Friction and Heat
Higher Speeds can be used
Reduction of Labor Costs
Less downtime
Improved Surface Finishes
Reduction of Tool Costs
Reduced Tool Wear
Improved Accuracy

6. Types of Cutting Fluids
Emulsions (water soluble)
Semi-synthetic (semi-chemical)
Synthetic (chemical Fluids)
Straight Cutting Oils

7. Synthetic Fluids (chemical fluids)
Contain very little oil
Depend upon chemical agents for:
1) lubrication
2) rust prevention
3) bacterial control

8. Emulsions (Soluble Oils)
Mineral oils mixed with water
Emulsifiers are needed.

9. Semi-synthetic fluids
Chemical fluids mixed with cutting oils
Two main types:
1) plain type
2) extreme-pressure type
- chlorine and sulfur are added

10. Straight Cutting Oils Not mixed with water. Two classifications
1) Inactive Cutting Oils
- very little sulfur is released/does not react
2) Active Cutting Oils
- releases sulfur/reacts with work surface

11. CUTTING FLUIDS Applications:
Flood
Spray-Mist

12. CUTTING FLUIDS Applications:
Through the Tool

13. CUTTING FLUIDS Review Questions
Name two important functions of a cutting fluid.
Name the four main types of cutting fluids.
Name 3 methods of applying cutting fluids.
List the non-cutting functions of a good cutting fluid.
What is a emulsifier?
Name the two classifications of straight cutting oils.

14. ANY QUESTIONS?