CV [Constant Velocity] Inverse Crank is similar to the Y–Inverse Sinusoid MotionLaw. We urge you to use this motionlaw in preference to the YInverse Sinusoid. This segment can be used more than once in one machine cycle, whereas the YInverseSinusoid can be used only one time. This segment is best explained by considering the X and Y motion components of a Point that is at the end of a rotating Part or Crank. When the Crank rotates with constant angular velocity, the horizontal* motion of a Point at the end of the Crank is 'SimpleHarmonicMotion' [ a Sine function] When you apply the 'ConstantVelocity InverseCrank' segment to a Crank, the Point can be made to move with a constant linear horizontal* velocity for a portion of the crank's rotation. Thus, the crank can make a full rotation in each machine cycle, but it does not rotate at constant velocity. * Actually, the motion of a Point on a Crank projected on to any line is SimpleHarmonicMotion. SEGMENTEDITORIn the Segment Editor  see image below with SegmentParameters You can set the:
If you use the FlexiblePolynomial Segment before and after this segment, you can:
SegmentParameters of the 'ConstantVelocity Inverse 

Schematic of Crank (green) made to give a constant linear velocity between the Start Angle(4) and End Angle(5). 
Segment Editor : SegmentParametersNote: These angles are on the Yaxis of the motion. They are NOT angles on the Xaxis. Minimum Velocity : the Angle of Minimum Velocity The angle, after the BaseValue* of the Crank, at which the angular velocity of the Crank is a minimum. At all other angles, within the range of this segment, the angular velocity of the Crank is greater than the Minimum Velocity. In full, we call this parameter the Angle of Minimum Velocity. The direction of the ConstantVelocity vector for Point on the Crank is projected onto an imaginary Line, which is perpendicular to the Angle of Minimum Velocity. *The BaseValue is the parameter defined in the MotionDimension FB dialog for the Crank, not by the position of the end of the PreviousSegment. Rel. Start : the Relative Angle before the Minimum Velocity Angle The angle, before from the Angle of Minimum Velocity, at which the ConstantVelocity of Point starts. Rel. End : the Relative Angle after the Minimum Velocity Angle The angle, after the Angle of Minimum Velocity, at which the ConstantVelocity of Point ends. Note: Rel. Start is less than Min Vel, and Rel. End more than Min Vel, when the Crank rotates CounterClockwise. Rel. Start is more than Min Vel, and Rel. End less than Min Vel, when the Crank rotates Clockwise. 

The velocity of the Point when projected on to the Line is constant while the crank moves within the angular range of: Start Angle = +  ...to... End Angle = + + The linear velocity and the length of the ConstantVelocity of the Point along the line depends on the:


Two CV InverseVelocity Segments in one Motion 
An example motion with four segments and two CV Inverse Crank Segment 1:
With these Parameters:
The Velocity, Acceleration and Jerk at the end of the PreviousSegment are made to match Start of this Segment. The Position at the end of the PreviousSegment (the end of the Motion) is usually = 'Position at Start + 360º' This makes sure the Crank rotates one time for each for each Machine Cycle Segment 2:


Segment 3:
With these Parameters
Segment 4:
