Y InverseSinusoidThis segment is best explained by considering the X and Y motion components of a Point at the end of a rotating Crank When a Crank rotates with constant angular velocity, the horizontal* motion of a Point at the end of the Crank is 'SimpleHarmonicMotion'. When you apply the 'Y–Inverse Sinusoid' segment to a Crank, the Point can be made to move at a constant linear velocity for a portion of the rotation. * Actually, the motion of a Point on a Crank projected on to any line is SimpleHarmonicMotion. In the BlendPoint Editor, edit the:


If EP is more than SP, then the ConstantVelocity motion is from left to right, not right to left 
In the Segment Editor, edit the:
The maximum range of the Rocker = ± Radius of the Rocker. The Radius of the Rocker specifies the maximum amplitude of the SimpleHarmonicMotion.
The Start Position must be within the maximum range. Specifies the motion value, in X–axis Units, that the tip of the rocker is at when the crank starts to move at a ConstantVelocity
Specifies the motion value, in X–axis Units, that the tip of the rocker is at when the crank ends the move at ConstantVelocity. Th End Position must be within the maximum range. 

If SP is more than EP, then the ConstantVelocity of the Point is from Right to Left. If EP is more than SP, then the ConstantVelocity of the Point is from Left to Right. An example with two segments. The first Segment:
With these Parameters:
The second segment:
This means the Crank rotates


† Why 60º? It is the angle of a triangle with the Hypotenuse of 100mm (Radius of Rocker) and an Adjacent of 50mm (Start Position). ‡ Why 120º? It is the supplementary and obtuse angle of a triangle with the Hypotenuse of 100mm (Radius of Rocker) and an Adjacent of 50mm (End Position).


Crank in MechDesigner.
Do not connect a wire from the Motion FB to the Motion Dimension FB.
This Part can be a 'Crank' for a Scotch Yoke Mechanism. 

At 0º of the Master Machine Angle, the output of the Y–Inverse Sinusoid is 60º. Hence, the 'Crank' moves to 60º when we 'Home' the Master Machine Angle. Between 0 and 90 of the MMA:
Between 90 and 360 of the MMA


This is a schematic of a 'ScotchYoke' mechanism. The End of the Crank has a Pin which engages in a slot. The Slot is vertical in this case, and rigidly attached to a slider that can slide in the horizontal direction. As the Crank rotates, the Slider moves right to left and then left to right. While the crank is between 60º and 120º, the Slider moves to the Left with a ConstantVelocity. See also Add RPP Dyad  Case 1 