Automatic Focusing

Focus Modes for Precise Laser Engraving and Cutting

The correct laser focus setting (i.e., the distance between the laser head and the material to be engraved) is key to achieving optimal processing results.

Four methods of identifying a proper focus setting are described below.

Close-up of Trotec Speedy series CO₂ laser cutter head with autofocus sensor in operation

Sonar Technology^TM

Trotec's Sonar Technology^TM (patent pending) enables the highest level of accuracy when focusing on your workpiece, regardless of where it is placed on the laser bed. With only one press of the Z-positioning keys, an ultrasonic sensor on the laser head detects the material's surface. The focal point is calculated automatically, and the Z-axis moves into the appropriate position.

Red laser head inside Trotec Speedy series CO₂ laser cutter with focus on positioning sensor

Light Bar Focus

This focus mode involves the use of sensors ("light barriers") which are laterally installed in your laser's interior. The work table automatically rises when this focus mode is enabled using the laser's keypad system.

The upward movement of the table stops as soon as your workpiece passes the light barriers. The correct focal point is then automatically calculated, and you can begin cutting or engraving.

The light bar focus is ideal for flat and opaque materials of an unknown thickness.

Close-up of Trotec Speedy series CO₂ laser head used for precision engraving and cutting

Focus Tool

Each focus tool's length is identical to the optimal focal length of its corresponding lens. For instance, a 2" focus tool has the same length as the ideal focal length of a 2" lens. Each tool is also appropriately colour-coded for easy identification.

The correct laser focus setting can be conveniently determined using a focus tool. The laser operator simply hangs the focus tool on the laser head, and proceeds to manually raise the work table until the tip of the tool touches the workpiece's surface.

This method is especially useful if you work with a variety of materials, if the material thickness is unknown (or can not be measured), or if you are processing round or cylindrical objects.

Trotec Speedy 400 CO₂ laser engraving machine with transparent lid on caster wheels

Speedy series
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Sonar TechnologyTM

Light Bar Focus

Focus Tool

Sonar Technology^TM