Unconstrained movement in a mechanism means that one link is heldfixed and the movement of any other link to a new position will notcause each of the other links to move to definite predictable positions
Pure mechanism deals with the motions and forms of the parts of a machine, and the manner of supporting and guiding them, independent of their strength
A machine is a combination of resistant bodies arranged so that the mechanical forces of nature can be compelled to produce some effect or work accompanied with certain determinate motions
A frame in a machine refers to the surfaces of contact between twopieces that have relative motion, one of which supports or partially supports the other
Translation motion means a body has motion with the same velocity, as regards both speed and direction, when all its component particles have the same velocity