MechDesigner Reference & User Interface > Dialogs > Dialog: Function-Block: Motion

Motion FB

A Motion FB is a direct link to a Motion that is in MotionDesigner.

Open the Motion FB dialog to select a Motion.

Connect wires to its input and output-connectors.

•Motion-values at its input-connector control the X-axis of the Motion you select.

•Motion-values at its output-connector are those Y-axis values that correspond to the X-axis value at its input for the Motion that you select.

The Motion FB selects the left-most Motion name-tab as the default Motion.

How to open the Motion FB dialog

Motion FB

To open the Motion FB dialog

1.Double-click a Motion FB in the graphics-area

1.See How to Open a dialog

The Motion FB dialog is now open.

Motion FB dialog

Motion Parameters

Select Motion:

Click the drop-down box to select a Motion from MotionDesigner.

The default link is to the left-most Motion name-tab and Motion.

After each Motion Cycle:

This parameter relates to progressive (indexing) motions, in which the motion-values at the start and end of the motion are not equal.

A Motion-Cycle is one revolution of the Master-Machine Angle from 0 to 360.

After each Motion-Cycle, at MMA=0, you can:

◉Reset Output: (default)

Start Position* (Machine-Cycle N) = Start-Position (Machine-Cycle 1)

◉Accumulate Output:

Start-Position* (Machine-Cycle N) = End-Position (Machine-Cycle N-1)

* Start-Position: See MotionDesigner > Blend-Point (or Segment) Editor > Y-axis values ...

Output Data-Type

◉ Motion : (default, for Rockers and Sliders)

◉ Linear *

◉ Rotary *

* You must select Linear or Rotary if you connect a wire from a Motion FB to a Motion-Path or a Math FB.

Notes :

Usually, the motion-data at the input to a Motion FB increases at a constant rate from 0 to 360, again and again.

However, the motion-data at the input to the Motion FB can change in any way.

For example, in one machine-cycle, the motion-data at the input to a Motion FB can be from a different Motion FB, or a Point-Data FB, or a Measurement FB.

Pattern

Ignore this separator

Query

Enter a Y-axis value

The values in the box (below) are the X-axis values that relate to the Y-axis value for the Selected Motion - see Motion Parameters

To Reset or to Accumulate after each Motion-Cycle?

We can explain with an example.

1.Design an Indexing Motion in MotionDesigner with two Segments:

Segment 1: Index (X-axis: 0-240 ; Y-axis: 0-90)

Segment 2: Dwell (X-axis: 240-360 ; Y-axis: 90)

2.Connect a Linear-Motion FB to a Gearing FB

3.Connect the Gearing FB to a Motion FB

4.Connect the Motion FB to a Motion-Dimension FB that controls a rotating Motion-Part (Rocker).

5.Edit the Base-Value in the Motion-Dimension dialog to 0º.

6.Edit the Motion FB:

•Select the Indexing Motion (see 1, above)

•Select Reset as the After each motion-cycle parameter

7.Edit the Gearing FB:

•Enter Gearing Ratio = 4 (enter 4 because the motion is 0 to 90, and 4 × 90 = 360)

8.Cycle the model with ALT+C on your keyboard.

Result:

As the MMA increases from 0 to 360, the:

•output motion-values from the Gearing FB increase from 0 to 1440 ( Gearing Ratio × 360 )

•output motion-values from the Motion FB increase from 0 to 90, and jump to 0 when its Round(input/360),(0 d.p) is an integer.

•Therefore, the indexing-shaft (Rocker) jumps to 0º four times, after it rotates to 90º.

9.Edit the Motion FB.

•Select Accumulate as the After each motion-cycle parameter

10.Cycle the model with ALT+C on your keyboard.

Result:

As the MMA increases from 0 to 360, the:

•output from the Gearing FB increases from 0 to 1440 ( Gearing Ratio × 360 )

•indexing-shaft indexes 4 times: from 0 to 90, 90 to 180, 180 to 270, and 270 to 360.