HSE Video – LEV for Controlling Metal Working Fluid Mist during CNC

LEVCentral Expert Commentary

MWF mist remains one of the most significant respiratory health risks encountered within engineering and manufacturing environments.  During CNC machining operations, mist generated by cutting and cooling fluids can become airborne and expose operators to substances capable of causing occupational asthma, dermatitis and hypersensitivity pneumonitis.

This HSE video provides an excellent practical demonstration of how engineering controls should be applied to reduce exposure at source.  Rather than focusing solely on extraction rates, the video highlights the importance of enclosure design, airflow patterns, filtration effectiveness and operator behaviour.

Particularly valuable is the discussion surrounding machine ‘Clearance Times’.  Many exposure problems occur when machine doors are opened before airborne mist has been adequately removed from the enclosure.  The use of time delays, airflow monitoring and effective commissioning procedures can significantly improve control performance.

For LEV professionals, the video reinforces the importance of considering the complete control strategy rather than viewing extraction systems in isolation.  Successful control of MWF mist requires integration of machine design, enclosure integrity, filtration systems, operational procedures, maintenance programmes and routine performance verification.

The video can be used effectively as part of toolbox talks, operator training, commissioning reviews and duty-holder awareness programmes.

Further Resources

• HSG258 – Controlling Airborne Contaminants at Work
• INDG408 – Clearing the Air: A Simple Guide to Buying and Using LEV
• HSE MW1 CNC Machining
• UKLA/HSE Good Practice Guide for Safe Handling and Disposal of Metalworking Fluids
• G406 – New and Existing Engineering Control Systems
• Working Safely with Metalworking Fluids (INDG365)

Recommended Learning

• P602 LEV Design Principles
• P601 Thorough Examination & Test of LEV Systems
• P600 Methods for Testing Effectiveness of LEV
• P604 LEV Performance Evaluation and Management
• M200 Basic Principles of Occupational Hygiene

Thought Leadership

• Defensible LEV Commissioning
• LEV Governance and Duty Holder Assurance
• Building a Defensible Exposure Control Strategy
• Preparing Effective TExT Reports