BM109 auto focus laser cutting head

The BM109 Auto Focus Laser Cutting Head from RayTools is designed for stable, high-efficiency fiber laser cutting up to 1.5 kW, combining automatic focusing, modular construction and advanced dust protection. To maintain its cutting accuracy, thermal stability and long-term reliability, the BM109 relies on a precisely matched range of original consumables and optical components.

This page focuses exclusively on those consumables, which are critical for ensuring consistent cut quality, protecting internal optics and minimising unplanned downtime.

Nozzles and nozzle holders

The BM109 cutting head uses M14 conical nozzles, available in single and double configurations, covering a wide diameter range.
These nozzles directly influence gas flow stability, kerf quality and piercing performance.

• Single nozzles are typically used for standard cutting applications where clean edge quality and controlled gas flow are required.
• Double nozzles, often chrome-plated, are preferred for thicker materials and more demanding cutting conditions, offering improved gas shielding and cutting stability.

The M14 nozzle holder ensures accurate nozzle alignment and secure mounting, which is essential for maintaining focal consistency during automatic height and focus adjustments.

Protective cover glasses

To safeguard the optical system, the BM109 incorporates multiple protective windows positioned along the beam path.
These cover glasses act as the first line of defence against spatter, fumes and airborne contaminants.

• Top and intermediate cover glasses protect the collimation lens
• The lower cover glass protects the focus lens, which is most exposed during cutting

Regular replacement of protective windows is essential to prevent beam distortion, power loss and premature damage to high-value lenses.

Seal rings

Each protective window is paired with a dedicated seal ring, engineered to provide airtight sealing between the glass and its housing.

These seal rings:

• maintain internal pressure balance
• prevent dust and cutting fumes from entering the optical chamber
• support the IP65 dustproof rating of the BM109 system

Worn or damaged seals compromise optical protection and should always be replaced during cover glass maintenance.

Optical lenses

The BM109 uses precision collimation and focus lenses, manufactured from fused silica and optimised for 1064 nm fiber laser wavelengths.

Available configurations include:

• meniscus and biconvex collimation lenses
• meniscus and biconvex focus lenses
• multiple focal lengths to match cutting thickness and application requirements

Maintaining clean, undamaged lenses is critical for stable beam quality, accurate focusing and efficient piercing.

Lens assembly kits

For faster servicing and reduced installation errors, lens assembly kits are available. These kits combine lens supports with matched collimation or focus lenses, ensuring correct optical alignment and simplifying maintenance procedures.

They are particularly valuable in high-throughput production environments where downtime must be kept to a minimum.

Sensors, cables and mechanical accessories

The consumables range also includes:

• capacitive head sensors, essential for accurate height sensing and automatic focus control
• transformer and signal cables, supporting stable sensor communication
• locking nuts, ensuring mechanical stability of optical assemblies
• lens change tools, designed specifically for safe and precise lens replacement

Each of these components contributes to the overall performance and reliability of the BM109 cutting head during daily operation.

Why use original BM109 consumables

Using original, specification-matched consumables ensures:

• stable cutting performance
• consistent optical alignment
• protection of high-value internal components
• reduced maintenance intervals
• full compatibility with the BM109 auto focus system

In high-precision laser cutting, consumables are not accessories — they are functional system components.