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Which are the six degrees of freedom that need to be restricted in component assembly?
The essence of workpiece positioning is to place the workpiece in a definite position within the fixture; therefore, the issue of workpiece positioning can be addressed by considering the determination of the coordinate position of a rigid body in a spatial rectangular coordinate system. In a spatial rectangular coordinate system, a rigid body has six degrees of freedom, namely three degrees of freedom for movement along the X, Y, and Z axes, and three degrees of freedom for rotation around these three axes. Using six support points distributed reasonably to restrict the six degrees of freedom of the workpiece, so that it occupies the correct position in the fixture, is known as the six-point positioning principle.
I can understand XYZ, but how can the 3 degrees of freedom for rotation around these 3 axes be explained? Please advise
Think about the old swing fans. XYZ is restricted, so it doesn’t move; Z isn’t restricted, so it can rotate to direct the airflow ； If X is not restricted, it’s possible to shake one’s head; if X is restricted, then shaking the head isn’t possible. That’s roughly what it means.