The parts were engraved with a 20 watt q-switched ytterbium fiber laser and 160 mm focal length lens. The marks were done at 3 different depths using 2 passes, 4 passes and 6 passes. The artwork on the part was duplicated.
Graphite
0.003 depth marked with 2 passes, cycle time of 34.48 sec
0.005 depth marked with 4 passed, cycle time of 1 minute and 9.31 seconds
0.010 depth marked with 6 passes, cycle time of 1 minute and 44.03 seconds