The machining spindle occupies a single orientation in relation to the part for all machining operations on a single face. By turning over the part, it is possible to machine a second associated face which will necessarily be parallel to the top face

The machining spindle's access to all sides of the individual polyhedron means the machine must have extra axes. In most cases, consideration must be given to how the part is gripped, which will reduce the machining spindle's access to all the machining sides, mainly the contact side.

The part should be positioned so that the spindle can access all the faces of the polyhedron. It should be able to be rotated quickly around its axis of symmetry in order to be able to create cylindrical revolution surfaces and internal or external diameters by turning.