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GeoGebraGeoGebra Classroom

Synthesis of a Double 4-bar Quick Return

Observe that the forward angle(Blue) is clearly bigger than the backward angle (Brown)

-Move the point A and observe that in a mechanism with quick return, the forward  angle is always bigger than backwards  -Change the transmission ratio (TR) with   the slider and observe how  α changes -L3 =Coupler's length > L2= Crank's length