Graph FB

see Add Graph FB

Graph FB

Use a Graph FB to plot Kinematic Data, Kinetostatic Force-Data and Cam-Data.

Y-axis input-connectors: Use the top, four input-connectors for the Y-axis of each graph.

X-axis input-connector: Use the bottom input-connector for the X-axis. If you do not connect a wire to this connector, the plots are made over one machine-cycle, 0 – 360.

Edit the Graph FB


Edit the Graph FB:

1.Double-click the Graph FB in the graphic-area.

- or -

The Graph interface is now open.

Graph FB dialog-box


1r Y–axis Scales

A Y-Scale for each input – from left to right, Y1 to Y4 [Y1 is the top input-connector to the Graph FB].
The colour of the Y–axis Scale and the graph-line are the same - edit the colours with the Graph Setting dialog.
The default setting is to 'auto-scale' the Y-axis. If you want to specify a minimum and maximum, use the Graph Setting dialog.

2r Y–axis Data-Channel [Drop-Down list]: See also Y–axis Data-Channel Display Options

Each wire that you connect to an input-connector has 3 Data-Channels.
You can select the Data-Channel.

3r Digital Readout (DRO):

The X–axis and the Y1–Y4-axis values at the position of the vertical cursorRed-14-6.
The Number-Format for the X–axis, Y–axis, and 'Data in Clipboard'Red-14-7, is configured in Application Settings | Number Format tab.

4r Graph Area:

The graphs for each wire you connect to a Y-axis input-connector

5r Toolbar:

Save, Print, Graph Settings, Zoom Extents, Pan Left, Pan Right, 'Copy Graph Data to Clipboard' – see Red-14-7 below

6r Vertical-Cursor:

When you click or drag your pointer in the graph-areaRed-14-4:

the Vertical-Cursor will move with your pointer
the Digital-ReadoutsRed-14-3 will continuously equal the Y-axis values at the position of the Vertical-Cursor on the X–axis
the Master Machine Angle will continuously update to equal the X-axis value of the Vertical-Cursor
the kinematically-defined Chains will move to agree with the Master Machine Angle.

7r Graph Data in Clipboard

When you click the right-most tool/icon in the toolbarRed-14-5 above the Graphs, the graph data is copied to the ClipboardRed-14-7.
There is one data-point, for each Machine Step - see Machine-Settings dialog > Number-of-Steps.

Paste this Data to Excel, or to MotionDesigner Data-Transfer table, where you can plot it as a Motion-Overlay.

Why are the Y–axis values given by the DRORed-14-3 slightly different to values for vectors I can see in the graphic-area?

The values may be slightly different because, in the graph, the X–axis and Y–axis values at the DRO must jump from 'machine -step' to 'machine-step', with each machine-step-increment a function of the Machine Settings dialog-box > Number-of-Steps.

In the graphic-area, the vector values are calculated for the value of the Master Machine Angle, which may not coincide with a machine step.

Y-Axis Data-Channels :

The 'Y-Axis Data Channels Set' are given in the drop-down at the right of the graph dialog-box.

To show more than one data-type from one output-connector of a FB, then drag a wire from an output-connector to different input-connectors of the Graph FB.

You can plot:

Three Data-Types available at the output-connector of a FB
To trouble-shoot. For example, the motion given to a Rocker or Slider is not as you expect.
To learn how FBs transform the motion data.

Function-Block (Linear-Motion, Gearing, Motion, Motion-Dimension) you can plot:

Linear or angular position
Linear or angular velocity
Linear or angular acceleration

Measurement FB or Point-Data FB you can plot

Linear or angular position
Linear or angular velocity
Linear or angular acceleration

Cam-Data FB

Pressure Angle.
You can plot three Pressure Angles – See Pressure Angle
Cam Radius-of-Curvature.
You can plot Radii-of-Curvature 1 and 2 for Cam 1 and Cam 2.
Contact Cam Force
Maximum Contact Shear Stress.
You must know the material properties to obtain this data. See 2D-Cam dialog-box.

Force-Data FB

The output form a Force-Data FB is a function of the element with which it is linked. See Force-Data FB dialog-box

If you link a Force-Data FB to a:

ŸPin-Joint with a Motor, you can plot Motor Load.
ŸSlide-Joint with a Motor, you can plot Motor Load
ŸJoint without a Motor, plot
oTotal Force [ FT = √(FX2 + FY2)
oForce along the X-coordinate of a Point: FX
oForce along the Y-coordinate of a Point: FY
Ÿ2D-Cam: you can plot the Cam Contact Force
ŸSpring FB: you can plot the Total Force, the X Force and the Y Force acting on the Point.

Tutorials and Reference Help Files for MechDesigner and MotionDesigner 14.2 + © Machine, Mechanism, Motion and Cam Design Software by PSMotion Ltd