Laser Gantry Design

The Gantry is driven by two synchronized DC servo-motors and is positioned by three independent closed loop linear encoders. A flexible gimbal linkage keeps the gantry from being over-constrained and allows the system to automatically square itself.

Inside the Gantry are precision rails, a linear encoder, cabling, assist gas tubing and the optical path to the Cutting Head. The Cutting Head includes the final mirror, focusing lens, focus sensor and gas assist nozzle assembly. The linear encoder is highly precise, with an optically based ruler, so that positioning accuracy is absolute and does not degrade over time. Ball-screw encoders, on the other hand, will begin to wear the instant they are put to use.

The Gantry is completely sealed to minimize maintenance and prevent exposure to the laser beam. This prevents dust from getting into the mechanical and optical components, so you don’t have to worry about cleaning them.

Motion Control Computer

Our machines use a proprietary motion controller that controls the motors and manages all of the safety and maintenance functions of the machine.

Accuracy / Resolution

The overall accuracy of both the Lumen and LMC machines is +/- 0.001" per foot, with a repeatability of +/- 0.0002" per foot.

The overall accuracy of cut parts can depend on the material, its thickness and how the material reacts to laser cutting. The width of cut (kerf) can vary between materials and needs to be tested with each material. Once the kerf has been established, it can be compensated for using the Offset feature in the machine’s CAD/CAM software (Laser-Link).

Look Ahead Contouring

The motion controller has "look-ahead" capability that allows it to pre-process several hundred vector points. If the vectors form a smooth shape, without large angular changes, the machine will move smoothly through the points without stopping. This feature can dramatically reduce cutting time for complex curved shapes.

 

Next Page: Optics