Marking black with normal USCAM fiber laser
For gold marking black: Make the marking head 2-3mm below or higher than focus point, and set power to be 70%, speed 100-300mm, and distance line 0.02mm. similar like that.
For aluminium and SS, 300mm lens marking black is better. Setting power to be 60%-80%, speed 100-200mm,distance line 0.02mm,frequency to be 45.
Marking deepth:
Using 100mm lens: Setting power to be 90%, speed 100mm,distance line 0.01mm,frequency to be 30.