<< Click to Display Table of Contents >> Navigation: Getting Started Tutorials - MechDesigner > Tutorial 1: Add a Part that Rotates - a Crank > Step 1.5: Add and Edit a Motion-Dimension FB |
To learn that: •Parts have two kinematic-states: kinematically-defined or not kinematically-defined. •Parts must be kinematically-defined before we can analyze their motions. •Part-Outlines have two colors to show you its kinematic-state. •that a Motion-Dimension FB (Function-Block) changes the kinematic state of a Part. •how to add a Motion-Dimension FB to control the angle of the Part relative to a Line. To explore the elements in the Kinematic-Tree. |
Tutorial 1 STEP 1.5: Add Motion-Dimension FB
A Part has two kinematic states. Either • A Part is not kinematically-defined OR • A Part is kinematically-defined When a Part is kinematically-defined, the Part has a Mobility = 0. We review Mobility in a later Tutorial. Kinematic States of Parts before we do STEP 1.5 (see STEP 1.4)
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You will be able to drag the Part-Outline around the Pin-Joint. The Part has one Degrees-of-Freedom. We use a Motion-Dimension FB (FB-Function-Block) to control the angle of the Part. The Part becomes kinematically-defined. |
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AAdd Motion-Dimension FB |
STEP 1: Start the Add Motion-Dimension FB command
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The Command-Manager has three selection boxes. t Note: you can use the Motion-Dimension FB to control the position of a Part along a Slide-Joint. The element-types you can click for the selection-boxes are:
* Solved = kinematically-defined ** Unsolved = not kinematically-defined *** Point - to control the Position of a Part along a Slide-Joint STEP 2: Select the three elements we need to Add Motion-Dimension FB
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Commandd Manager with selections |
STEP 3: Complete the command
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Result
Note: The Motion-Dimension FB element has two features. There is the: Function-Block Motion-Dimension |
Edit the Base-Value parameter in the Motion-Dimension dialog. The Base-Value is an offset value of the angle |
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Motion-Dimension FB dialog |
STEP 1: Open the Motion-Dimension dialog
The Motion-Dimension dialog is now open. In the Motion-Dimension dialog > Base and Motion Angle STEP 2: Edit the Parameters
Directions It is possible to negate the Base-Value and the Motion-Value.
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In the graphic-area, the Motion-Dimension FB includes the: A: FB - the icon B: Dimension Value, Line, and Arrowheads of the Motion-Dimension |
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MOVE the Mot-Dim FB = DRAG FB |
Please read carefully In the graphic-area, ... To move the FB only ... Drag the FB The FB moves from to .
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MOVE the Dimension Line/Arrowheads |
In the graphic-area... To move the Dimension Value, Line, and Arrowheads of the Motion-Dimension CTRL + Drag the FB The Motion-Dimension snaps to your mouse-pointer, from to , and moves with the FB. |
The Part, Pin-Joint, and Motion-Dimension are the elements that make a Rocker. A Rocker is a Motion-Part. |
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Explore the Kinematics-Tree, to see the three elements that identify a Rocker. |
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Kinematic-Tree with Elements for a Rocker |
Part |
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Pin-Joint |
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Mot-Dim Rocker |