Emulsion for CNC machines

In CNC (computer-controlled machining) machines, maintaining the quality of the emulsion (water-oil based coolant) is critical to proper system function and optimal part performance. A quality emulsion extends tool life, improves surface finish, prevents overheating, and keeps the machine and parts clean.

What is an emulsion?

An emulsion is a mixture of oil and water, where the oil is dispersed in the form of tiny droplets in the water using emulsifiers. The result is a coolant that offers:

• Effective cooling of the cutting tool and material.
• Lubricant to reduce wear between the tool and the material being processed.
• Corrosion protection for machine parts and machined parts.

Why is it important to maintain the quality of the emulsion?

Proper emulsion:

• Prevents overheating and rapid wear of tools.
• Maintains dimensional stability of the machined part.
• Reduces the chance of bacteria and bad odors forming.
• Extends coolant life and reduces maintenance costs.

On the other hand, a damaged emulsion can cause serious problems such as:

• Shortening tool life.
• Damage to the machine (such as corrosion).
• Poor finishing of parts.
• Foam formation, bad odors, and mold.

How do you check the quality of the emulsion?

To ensure optimal operation, it is recommended to perform periodic emulsion checks on CNC machines. Here are the main checks:

1. Concentration test (Brix / Refractometer)

• How to test : Use a refractometer , a small handheld device that measures the refraction of light in a liquid, which gives an indication of the oil concentration.
• What is important to know :
  • Each type of emulsion requires a di