Complete positioning and incomplete positioning in machining

Full positioning: the six degrees of freedom of the workpiece are completely limited
Incomplete positioning: allows one or more degrees of freedom to be unrestricted
When positioning the workpiece, incomplete positioning is allowed under the following conditions
When machining through holes or slots, the position freedom along the through axis can be unlimited.
When the workpiece is axisymmetric, the rotational degree of freedom around the axis of symmetry is not limited.
When machining the through plane, not only the position freedom along the two through axes, but also the angle freedom around the axis of the vertical processing plane can be unlimited.