As to not hijack from others, aside from a brute force standpoint is there a method to deep engrave on metals that is considered standard? Point of clarification: I am engraving my Glock slide. So far I can get about a 0.5mm before the machine seems to "bottom out". I would love to hear any input. Being as that I ran many hours of passes today I was able to test just about everything...hatch type, spacing, speed etc. It seems that depth [on 30W fiber] is achieved at around 250/200 mm/s at 100p with clean-ups in between. What do you all think?