The parts were engraved with a 20 watt q-switched ytterbium fiber laser and 160 mm focal length lens. The 160mm focal length lens has a working distance of 176mm from lens to part. The marks were done at 3 different depths using 2 passes, 4 passes and 6 passes. The artwork on the part was duplicated.
Graphite:
The first mark had 2 passes, cycle time of 32.59 seconds
The second mark had 4 passes, cycle time of 65.17 seconds
The third mark had 6 passes, cycle time of 97.75 seconds