A Traditional Motion-Law allows you to specify a position at its start and its end, but not a velocity, acceleration, or jerk. The velocity and acceleration values are usually zero.
See Standard or Traditional Segments
Here, we show you how to edit the Position at the Start of a Traditional Motion-Law.
We consider the two cases:
Case 1: The Previous-Segment is also Traditional Motion-Law.
and
Case 2: The Previous-Segment is a Dwell Motion-Law - which is a special case of a Traditional Motion-Law.
VIDEO OF THIS TUTORIAL
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![]() Motion Graphs of Traditional Motion Laws
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In the image to the left, the:
To edit the 'End of the Modified-Sinusoid' / 'Start of the Modified-Trapezoid' Motion-Law:
![]() Start Blend-Point Editor ![]() Position Values in the Blend-Point Editor In the Y-axis Values separator of the Blend-Point Editor
The Position at the end of the Modified-Sinusoid Segment changes to the motion-value you enter in the Position data-box. Question: Why are the Velocity, Acceleration, and Jerk Control Buttons disabled? Answer: You cannot edit them. The motion derivatives are fully defined by the mathematical function that specifies the Modified-Sinusoid segment. The Velocity and Acceleration values are zero. The Jerk is another value. |
Let's see what is in the Blend-Point Editor when the Modified Trapezoid motion-law is the Selected-Segment.
![]() Start Blend-Point Editor In the Y-axis Values separator of the Blend-Point Editor
This is because the End Position of the Previous-Segment, when the Previous-Segment is a DWELL, and the Match Control-Button is active also, can ONLY be specified at the start of the DWELL. When the Match Control-Button is active, you cannot edit the Start Position of the Selected-Segment. This is because, nearly always, the Position motion-values 'flow' from one segment to the next so that there is not a position discontinuity. To edit the end of the Dwell Segment you must the Start Position of the Dwell Segment. Thus:
The Dwell Segment becomes the Red Selected-Segment. Make sure the Match Control-Button is active
This becomes Start-Position of the Dwell Segment ... ... which automatically becomes the End-Position of the Dwell Segment (logically, it must) ... ... which becomes the the Start-Position of the Modified-Traditional segment. |