Prepare the Sliding-Part

We add a Slider, and a rotating Cam to move the Slider as a Translating-Follower.

tog_minusPreparation 1A: Add a Part, Add a Sketch to the Part, Add a Line to the BasePart

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Add a Mechanism to a Plane.

Then, in the Mechanism-Editor:

STEP 1: Add a Part – see the image to the left.

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STEP 2: Edit the Part.
STEP 3: Add a sketch to the Part similar to the sketch shown to the left. Make sure it is a sketch-loop.
STEP 4: Close the Part-Editor

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STEP 5: Use the Part-Editor to edit the Base-Part
STEP 6: Add a Line to the Base-Part, dimension it.
STEP 7: Close the Part-Editor.

Question: Why is the Line in the Base-Part Green, while all the Lines in the Added-Part Blue?

Answer: The colour of the sketch-elements in a Part agrees with the colour of the Part-Outline in the Mechanism-Editor.

The Base-Part is a kinematically-defined Part and, therefore, it is Green.

The Added-Part is not yet Kinematically-Defined and, therefore, it is Blue. It is often called a Free-Part.

tog_minusPreparation 1B: Add a Slide-Joint

Icon-AddSlideJoint

Add a Slide-Joint:

STEP 1: Click Add Slide-Joint, in the Machine-elements toolbar

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STEP 2: Click the Line in the Base-Part, and then
STEP 3: Click the CAD-Line along the centre of the Added-Part (deep green)

In the image to the left, the second Line is being clicked.

The image below shows the Slide-Joint.

The Part-Outline stays blue. This means it is not kinematically-defined. You can still drag the Part along the Slide-Joint if you drag the Part-Outline.

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To remind you: the Slide-Joint is given symbolically in the graphic-area by:

1.Two rectangles that extend along the length of the two Lines that are each a child to each Part in the Slide-Joint:
a thin rectangle (the 'slide-rail') on the kinematically-defined (green) Part,
a wider rectangle ('slide-block') on the free (Blue) Part
2.A small filled arrowhead on the 'start' Point of the Line that is the kinematically-defined Part (this was the Base-Part). The arrowhead direction gives the positive direction of the Slide-Joint.

Note: As a reminder: the 'start-Point' of Lines and Parts is the Point where you start to 'Drag' the Line or Part.  Parts show its origin with the XY-axes. However, Lines do not show their axes. You must remember the start-Point and origin of a Line.

tog_minusPreparation 1C: Add a Slider Motion Dimension FB, Motion FB, and Linear Motion FB

Icon-FB-MotionDimension

STEP 1: In the Kinematic-FB toolbar , Click Add Motion-Dimension FB.

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Reminder: You can add a Motion-Dimension FB to a Pin-Joint or a Slide-Joint, to make a 'Rocker' or 'Slider' respectively.


The Command-Manager shows you must select three elements.

STEP 2: Click the Rectangular Symbol for the Slide-Joint.

You can select the Rectangle that is around the Line in the Sliding-Part, or around the Line in the Base-Part.

Because you select a Slide-Joint as the first element, the second and third elements can only be Points.

You must select a Point in the kinematically-defined Part (Green) – also called the 'Solved' Part.
You must select a Point in the Part that is not yet kinematically-defined Part (Blue)

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STEP 3: Click the Point with a small arrowhead at the start of the Line in the Base-Part - it is Green
STEP 4: Click the Point at the start of the Line in the sliding-part - it is Blue.

 

Top-Tip: Each Line has 2 Points. Try to select the start-Point of the two Lines in the Slide-Joint.

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The Added-Part is Green to indicate it is now a kinematically-defined Part.

Edit the Base-Value with the Motion-Dimension dialog-box.

STEP 5: Double-click the Motion-Dimension arrowhead or the Motion-Dimension FB icon in the graphic-area

Change the Base-Value to 30mm

 

To make the Slider move and be useful, add a Motion FB and a Linear-Motion FB.

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STEP 6: Click the Point at the Start of the Line in the Part that is still Blue
STEP 7: Click the Motion FB in the Kinematic-FB toolbar, then the graphic-area
STEP 8: Similarly, Click the Linear-Motion FB then the graphic-area
STEP 9: Connect the Function-Blocks.

If you cycle the Machine (keyboard shortcut: ALT+C, [C for R13.2+]), the Slider will move from 30mm to 130mm then return, and again and again for each machine cycle.

tog_minusPreparation 1D: Add a 2D Cam and Cam Follower

We rotate a 2D-Cam to drive the slider back and forth.

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Add the sketch for the centre of a cam-shaft.

STEP 1: Edit the Base-Part
STEP 2: Add a short, horizontal Line1s-red, approximately where you want the centre of the cam-shaft.

You can see the new Blue Line, at the bottom. It is Blue because we have not yet specified its Length.

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Add a sketch for the Cam-Follower.

STEP 3: Add a circular2s Cam-Follower to the Slider.

 

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STEP 4: Add a Profile.

Use the Cam-Follower Roller3s sketch.

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Add a 'cam-shaft' that rotates one time per machine cycle. This is Tutorial 1.

Use the Line in the Base-Part as the centre of the cam-shaft.

STEP 5: Add a Part4s
STEP 6: Add a Pin-Joint
STEP 7: Add a Motion-Dimension FB, and
STEP 8: Add a Linear-Motion FB.
STEP 9: Connect the Function-Blocks

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Now, at last, add the 2D-Cam

STEP 10: Click Add 2D-Cam.
STEP 11: Click the new cam-shaft
STEP 12: Click the Cam-Follower Roller
STEP 13: Click OK in the Command-Manager.

The new 2D-Cam5s shows in the graphic-area.

If you cycle the model, the 2D-Cam rotates one time as the Slider moves back and forth one time.

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