I engraved a brass coin today with my fiber laser. I used the 3D Sliced function with 80% power, 500mm/s speed and 847dpi resolution at 256 layers.
After carefully cleaning the coin with a dremel and bristle discs, I noticed that there are fine lines and moiree patterns. What tricks can I use to prevent such patterns from appearing? Should I use a higher resolution or defocus the laser slightly? I suspect these are artifacts of the individual lasered lines and the crosshatching.
I use a 30W fiber laser from Cloudray with a 110x110 theta lens. The calibration actually looks good so far.
Thank you for any help!