Motion

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

For motion design software to be useful, the motion must be made 'visible' by representing it somehow. The easiest method is to plot a motion as a graph. This is what MotionDesigner does.

Another method we can use to make the motions visible is to move machine-elements in a CAD-model with the same motions as the motion graphs. This is what MechDesigner does.

Motion Graphs in MotionDesigner

There are four motion-derivatives available in MotionDesigner: Position, Velocity, Acceleration and Jerk. Each motion-derivative has its own graph.

You can use the P,V,A, and J icons in the View Toolbar, to show or hide the motion-derivative graphs.

MotionDesigner-MotionOnlyExample-Understanding

CONCEPT 1: The same X–axis 1s-red for all Graphs

All of the motion-derivative graphs have the same X-axis. The X-axis scale is at the bottom of the graphs. Machine Angle, or time, increases from left to right.

Each motion graph, in each motion name-tab, can have a different X-axis scale. Most typically, the X-axis scale is in machine degrees from 0 to 360.

 

CONCEPT 2:The same motion for All motion-derivatives2s.

The same motion is displayed, exactly above each other.

You cannot edit one motion-derivative independently of another motion-derivative.

This is because each graph plots the same motion, but at a different motion-derivative.

 

CONCEPT 3: motion is split into Segments

It is convenient to split the motion into segments.

You can select a Motion-Law for each segment, in the Motion-Law Selector.

 

CONCEPT 4: Blend-Points4s join the segments

Blend-Points joins the segments end-to-end. These are also called 'Nodes'.

 

CONCEPT 5:  Segment naming conventions.

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

Selected-Segment3s - the RED segment you edit.
Previous-Segment - the segment before the Selected-Segment.
Next-Segment - the segment after the Selected-Segment.

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

Tutorial and Reference Help Files for MechDesigner and MotionDesigner 13.2 + © Machine, Mechanism, Motion and Cam Design Software by PSMotion Ltd