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SIX-BAR CROSSED-CRANK MECHANISM

The lengths of the links comply with the conditions: A͞B=D͞C and B͞C=A͞D. Thus four-bar mechanism ABCD is a crossed-crank linkage, and links 1 and 3 rotate completely about fixed axes A and D. Links 4 and 5 are connected by turning pairs E and G to cranks 1 and 3. Upon rotation of crank 1, point F describes the connecting-rod curve shown in the drawing. Uncertainty of motion of the mechanism is el…