Step 5.3: The Motion-Dimension FB

Kinematics-FB toolbar > Add Motion-Dimension FB

The Command-Manager has three selection-boxes for three elements.

Selection-Box & Element 1: A Joint

Selection-Box & Element 2: Select a Solved Line or Point [in a 'Green' Part*]

Selection-Box & Element 3: Select an Unsolved Line or Point [in a Blue Part*]

are Lines if you select a Pin-Joint .

are Points if you select a Slide-Joint .

*A Solved Part is a kinematically-defined Part.  The Parts have a Green Part-Outlines

An Unsolved Part is a Free-Part [NOT Kinematically Defined]. The Parts have Blue Part-Outlines.

The FB in the graphic-area becomes different to the FB in the Kinematic-FB toolbar.

The Motion-Dimension FB in the graphic-area for a Rocker.

The Motion-Dimension FB in the graphic-area for a Slider.

PREPARATION:

Refer to example images to the left, indicating the elements you must select.

Before you can add the Motion-Dimension FB, you must have, at minimum of:

1.

Two Parts

•	One Part must be a kinematically-defined Part It has a Green Part-Outline... The Base-Part is an example

and

•	The other Part must be Free Part It has a Blue Part-Outline

2.	A Pin-Joint It joins a Point from a Line in each of the two Parts The Lines radiate (are rays) from the Pin-Joint.

Two examples to the left:

SELECT ELEMENTS: Element 1: PIN-JOINT

Click Kinematic-FB toolbar > Add Motion-Dimension FB

In the Command-Manager: You have the option to select a Pin-Joint or a Slide-Joint as the first element.

For the Part to become a Rocker, you must select a Pin-Joint.

Rule 1 [Rocker]

Rule 2 [rocker]

SELECT ELEMENTS: Elements 2 & 3: LINES

After you select a Pin-Joint as Element 1, you must select Lines as Elements 2&3.

Rule 3 [rocker]

Note: To end and place the Motion-Dimension FB icon in the graphic-area:

•	Left-Click the in the Command-Manager . The Motion-Dimension FB icon is at the left of the graphic-area, and not a very convenient place.

or

RESULT: The Motion-Dimension FB and a Pin-Joint.

The 'Free-Part' becomes a Rocker and kinematically-defined, with a Green Part-Outline, after you click in the Command-Manager.

Two examples of a Rocker in the images to the left.

When we add a Motion-Dimension FB to a Pin-Joint, we call the Part a Rocker.

A Rocker is a Motion-Part.

To edit the Base-Value [start-position] of the Rocker, open the Motion-Dimension FB dialog-box.

1.	Double-click the Motion-Dimension FB

- or -

1.	Double-click the Motion-Dimension dimension-line or dimension-arrowhead [Not the dimension value itself]

- or -

See How to Open a Dialog-Box

Note: After you add the Motion-Dimension FB, you may want to move the FB or the Motion-Dimension to a more convenient place in the graphic-area:

PREPARATION

Your model must have:

1.

Two Parts

Before you add the Motion-Dimension FB, the Parts are:

•	A kinematically-defined Part (Green Part-Outline)...[for example, the Base-Part]

and

•	A Free-Part (It has a Blue Part-Outline)

2.	a Slide-Joint

The Slide-Joint joins a Line in the two Parts [see 1]

Note: The arrowhead shows the Positive direction of the Slide-Joint.

SELECT ELEMENTS: Element 1: SLIDE-JOINT

Rule 1 [slider]

•	Element 1: is a Slide-Joint that joins a kinematically-defined Part to a Free Part

Rule 2 [slider]

You must select Points as the Elements 2&3

SELECT ELEMENTS: Elements 2&3: POINTS

After you select a Slide-Joint as Element 1, you must select Points as Elements 2&3.

Rule 3 [slider]

The 'Free-Part' becomes a Slider and kinematically-defined, with a Green Part-Outline, after you click in the Command-Manager.

RESULT: The Motion-Dimension FB applied to a Slide-Joint.

We call the Part a Slider after you have added the Motion-Dimension FB.

A Slider is a Motion-Part.

To edit the initial position of the Slider, use the Motion-Dimension FB dialog-box.

- or -

Notes:

To move the Motion-Dimension Function-Block:

To move the Motion-Dimension:

You cannot specify the initial position of the Motion-Part as you add a Motion-Dimension FB.

To edit the initial position of the Motion-Part - we call it the Base-Value - we must open Motion-Dimension FB dialog-box.

To edit the Motion-Dimension FB:

The Motion-Dimension FB dialog-box opens.

o	Base-Value [ the Base-Value text is missing!]

The Base-Value should be above the dimension box '47.438903'...! at the Top of the Motion-Dimension dialog-box.

- or -

o	Base-Value + Motion Value

It is best to think of the:

Directions separator, there are options to:

The image shows the elements in the graphic-area after Steps 1-10.

The 'top' Linear-Motion FB adds 30 to the MMA.

We have connected a wire from the Linear-Motion FB directly to Motion-Dimension FB

We have connected a wire from the Motion-Dimension FB directly to the Y1 input of the Graph FB.

The Motion-Dimension dialog-box and the Graph FB are open.

The 'Base-Value' of the Motion-Dimension is 110º in the Motion-Dimension dialog-box.

The Master-Machine-Angle (MMA) is 120º

Thus, the output from the Linear-Motion FB is 120º + 30º = 150º.

This means the input to the Motion-Dimension FB = 150º.

The Base-Value for the Motion-Dimension is 110º.

Thus, the Rocker angle is at 110º + 150º = 260º.

The output from the Motion-Dimension FB is also the input to the Graph FB.

When you open the Graph FB, the red cursor is at the MMA.

If you set the red cursor to 120º, the Y-axis value is 260º.

The Graph shows a plot of the output of the 'Motion-Dimension FB against the 'bottom' Linear-Motion FB(0 to 359º)

The DRO shows the X-axis (red-cursor) is at 120º, the Y-axis Output is at 260º.