Linkage Instant Center Animation
Please enable Java for an interactive construction (with Cinderella). Remember that the instant center of the coupler link is only the instant center instantaneously. This animation shows how the instant center moves over time for this particular linkage. For some linkages, when the instant center is conincident with one of the coupler link joints, the linkage can lock up. On this particular linkage, however, the angular velocity of the crank link (black) is not affected.

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