Last night, I tried engraving with CNC, and I think it messed up because of the tool paths. From a topological perspective, it’s relatively simple. Just two different heights. There’s some detail wich is at maximum depth and a region that’s at like half depth.
I drew out the image as a greyscale SVG with the deep areas black, and the receded area grey.
What’s weird is that it appears to have first cut all the black areas, and then went tried to go back over and cut recessed (grey) areas.
This didn’t work. When it went back to cut the recess, I guess it caught the edge some of the already cut deep detail area and through the stock out of the clamp. I would have thought that it would have cut everything simultaneously, and not done two paths.
I guess I’ll try doing it as two passes manually later, but I’m surprised by this.
However, the image you shared is not SVG but a bitmap, so this might be part of the difference. Would you mind to share the SVG?
That said, and knowing that this is only of limited help: Luban is not the most sophisticated CAM software for milling - if you look for real control over the toolpaths, you need to go for 3rd party software. Fusion 360 is free for non-commercial use (but has a bit of a learning curve), DeskProto is affordable for a hobbyist (250,- €), but not as powerful but easier to learn than Fusion, but much better than Luban. Much more other software exists, but usually is very pricey.
