Understand the Graphs

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Understand the Graphs


Motion is an abstract concept. It is difficult to order a motion off eBay or Alibaba, for example.

Motion design software is only useful if the motion is visible. The easiest method to make a motion become visible is to plot a motion as a graph - this is MotionDesigner.

A different method is to move machine-elements in a model with the same motions as the motion graphs. That is what MechDesigner does.

Motion Graphs in MotionDesigner

You can see up to four graphs in MotionDesigner: Position, Velocity, Acceleration, and Jerk. These are the four motion-derivatives.

You can use the P,V,A, J icons in the View Toolbar, to show or hide each motion-derivative. You must show a minimum of one graph.


You should understand:

Red-14-1b: The X–axis  is for all Graphs

The four motion-derivatives have one X-axis. The X-axis is at the bottom of the graphs.

Most typically, the X-axis is from 0 to 360 degrees - equal to the Master-Machine-Angle in MechDesigner.

Other units for X-axis are: radians, cycles, seconds, milliseconds.

The X-axis units of each Motion name-tab, can be different.

Red-14-2: Each motion-derivatives is the same motion.

We show for you the motion-derivative of the same motion exactly above each other.

If you edit a motion-derivative of one segment, you also change the shape of the segment of the other motion-derivatives.

Red-14-3: Split the motion into Segments

It is easier to design a motion when you split it into segments.

Each segment has a Motion-Law.

You can change the Motion-Law for each segment, with the Motion-Law Selector  - a drop-down box below the graph-area..

Red-14-4: Blend-Points join the segments

Blend-Points join the segments end-to-end. (Blend-Points are also called Nodes).

5:  Segment naming conventions.

For convenience, we name the segments in the help as the:

Selected-Segment - the RED segment you edit.

Previous-Segment - one segment before (to the left) the Selected-Segment.

Next-Segment - one segment after (to the right) of the Selected-Segment.

As soon as you click a different segment, it becomes the Selected-Segment and RED.