Figure 10a, b: The user interface (Human Machine Interface, HMI) is an important subsystem of the machine and normally falls into one of two classifications: There are "CNC style" HMIs that import and execute machine-coded programs (typically G code) created by a CAM software post processor (a). Another type is an integrated graphical interface. Some HMIs allow importing as well as processing of CAD files and offer integrated functionality for post processing of the CAM data (b). (Source: ACS Motion Control)
Simple implementations of galvanometer scanners and positioning systems do not operate simultaneously but sequentially, dividing large areas into smaller segments “stitched” together. Large areas with many small details cannot be marked efficiently in this way. Smaller details require high accelerations and large areas require longer travel ranges. A multi-stage approach is recommended separating the trajectories for smaller, lighter, and therefore faster positioning systems with shorter ranges, and for larger, heavier, and relatively slower motion components with longer travel ranges.
Laser marking functions in a similar way to human writing. The arm, a slow musculoskeletal system, provides gross manual dexterity while the hand and fingers accurately form the individual letters, which correspond to the motion of the galvanometer scanner. Analogous to this, the motion patterns from the XY stage and scanner are synchronized by a controller and run simultaneously during scanning. This process allows efficient marking of large areas with many small details and therefore increases the throughput.
Because smaller laser beam deflection angles have a positive effect on optical errors, higher processing accuracy is achieved when compared to the traditional process; at the same time, stitching errors are eliminated (see fig 11, 12).