Projection milling techniques are a robust and easily understood method of generating 3D toolpaths. They work by taking a pattern of curves and projecting points from these curves onto the surfaces of the part.
Advantages
- It is robust.
- It handles overlapping surfaces well.
- It is good for multiple surface manufacturing.
- It lets you specify planar stepover distances or scallop heights for finishing.
- Surface normals are not considered for the manufacturing computation.
Disadvantages
- It has poor handling of near-vertical surfaces.
- It does not handle vertical surfaces because they are invisible from above.