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A Mechanical Pair having a definite motion with respect to another element.
Types of Constrained Motion:
- Completely constrained
- Partially or Successfully constrained motion and
- Incompletely constrained motion
1. Completely motion:
Whenever the motion between the pair takes place in a definite direction irrespective of the direction of the force applied, then the motion is said to be completely motion.
Square bar in a square hole
Shaft with a collar at each end in the circular hole.
A piston in the cylinder of an IC engine.
2. Partially or Successfully motion:
Whenever the motion between a pair is not completed by itself but by some other means, it is said to be successfully motion.
The motion of the shaft in a footstep bearing becomes successfully constrained motion when a compressive load is applied.
3. Incompletely motion:
Whenever the motion between a pair takes place more than one direction is called incompletely motion.
Circular shaft in a circular hole, as it may be either rotate or slide in a hole. Both motions have no relationship with others.