FeatureCAM has different methods of Z level roughing.
- Mills the wrong side of the surfaces.
- Toggle the Classify slices as attribute on the Strategy tab.
- If the Classify slices as attribute is set correctly, make sure that the normals of the vertical surfaces are pointing out. Use the Surface Control tab to reverse the surfaces.
- Slices are coarse.
- Decrease the Tolerance attribute on the Milling tab.
- The slices look strange around holes or passages in the walls of the feature.
- Use a cap surface to plug holes (or untrim the surface), or use a larger diameter tool.
For a generalized boss, FeatureCAM uses the stock boundary or stock curve as the outer boundary of the boss.
Control Z-level roughing with the Corner radius %, Toolpath corner %, and Trochoidal cut attributes on the Milling tab of the Surface Milling Properties dialog.