Cutting fluids are the fluids which are generally applied while the machining (or cutting) operation is taking place. The machining operation can be any i.e. milling, turning, drilling etc. Sometimes a cutting fluid is also referred as coolant. A cutting fluid performs several functions and cooling the tool and workpiece is just one of them.

Functions of cutting fluids: As mentioned above Cutting fluids performs several functions and some of them are….

• Cool the tool and workpiece
• Reduce the friction
• Protect work against rusting
• Improve the surface finish
• Prevent the formation of Built-up edges (BUEs)
• Wash away the chips from the cutting zone

All the above functions are performed with the help of cooling and lubricating action of cutting fluids. It means a cutting fluid should have excellent cooling and lubricating properties.

Methods of applying cutting fluids:

Cutting fluids can be applied to the tool and workpiece in the following three ways.

Flooding:

In this method tool and workpiece are supplied with high volume of the cutting fluids which are generally in liquid condition.

Jet application:

In this method the cutting fluids which may be either gas or liquid are applied with high pressure on the tool and workpiece.

Mist application:

In this method the cutting fluids are mixed with a gas (generally air) and applied to tool and workpiece. Mist application combines the properties of above mentioned both methods i.e. flooding and jet application.

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