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.
Hopefully someone has found a solution. I am having this exact same issue as well, I am thinking if there was an auto rotation option it would help with this, but I have not been able to successfully use the 3D slice mode because of the lines it is creating.
The only solution I’ve found is a change in interval… I assume it has to do with the step rate…
I think this was brought up and one of the developers advised that they couldn’t guarantee that the dots will line up with other than a scan change you get with 3dslice.
Good luck
This is best guess as an interval change has helped me…
Auto-Rotation hasn’t been added yet because the image resampling required causes the layers to shift a little relative to each other.
If you apply airflow across the coin to prevent dust from settling on it, that will prevent it from being fused back into the coin on subsequent passes, and that should fix most of this.
