Polynomial 2-3 Cam-Law, Motion-Law

The Polynomial 203 Motion-Law is not available directly with the Motion-Law Selector.

You can edit the start and end of a Flexible-Polynomial motion-law be the same as the Polynomial 2-3.

Polynomial 2-3 is a Traditional Motion-Law

CamLaw-Polynomial-23

This segment is included for reference.

A different name for this motion-law is a Parabolic Velocity.

This motion-law is not usually recommended.


The maximum velocity is the lowest of the Traditional Motion-Laws.

Dynamic Performance

Polynomial 2-3:

when preceded by a Dwell, has a Motion Discontinuity in Acceleration at the start and end of the segment.
has infinite jerk at the start and end of the segment.
should only be used in applications where the period-ratio is much greater than 10, ideally at least 20.
uses the minimum energy from a servomotor or stepper motor.

Polynomial 2-3 and Flexible Polynomial Motion-Laws

If you can put a Flexible Polynomial motion-law before and after the Polynomial 2-3 segment, then it is possible to make sure the motion is continuous in position, velocity and acceleration.

However, it is best to make all of the segments a Flexible Polynomial.

Help Files for MechDesigner and MotionDesigner 11.1 + © Machine, Mechanism, Motion and Cam Design Software by PSMotion Ltd