Summary
•Add a new Mechanism-Editor to the Front-Plane
•Add the Parts for the Cam and Cam-Follower. The Cam is a Cam-Shaft. The Cam-Follower is a Translating-Part.
•Add a sketch-loop for the Flat-Faced Follower-Profile.
•Add the 2D-Cam
Add the Parts Cam and Cam-Follower Parts.
 Sliding-Axis anda Line to locate the start-Point
 Dimensions to locate the position and direction of the Sliding-Axis |
STEP 1: Add a new Mechanism-Editor to the Front-Plane
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1.
2.Model-Editor: |
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3.Model-Editor: Click the Front Plane
4.Click  in the Command-Manager. |
STEP 2: Edit the Base-Part to add a Line for the Rotational centre of the Cam-Shaft
1.Edit the Base-Part
2.Part-Editor: . Its start-Point locates the center of the Cam-Shaft
3.Part-Editor: Click the Line
4.Part-Editor: Click the Y-axis then the start-Point of the Line, then again,
5.Part-Editor: Click the X-axis and the start-Point of the Line
6.Part-Editor: : Enter 50mm |
STEP 3: continue .... add a Line for the Sliding-Axis of the Translating Cam-Follower
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In the image, you can see that the sliding-axis of the Cam-Follower is not vertical or horizontal. It is also offset from a radial axis that radiates from the rotating-axis of the Cam-Shaft .
The offset will not change the cam. However, it moves the contact point between the Cam-Profile and the Follower-Profile to the left or the right of the sliding axis. Thus, it will change the overturning moment, which is the moment that tries to bend the sliding-Part in its slide-way.
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STEP 4: Add the Cam as a Cam-Shaft.
1.: Click and drag to add the Part
2. Click the start-Point of the new Part and the start-Point of the Horizontal Line in the Base-Part.
3.: Click the Pin-Joint, click the Horizontal Line in the Base-Part, and click the CAD-Line in the new Part.
4.Click the FB and then the graphic-area.
5.Connect a wire from the Linear-Motion-FB to the Motion-Dimension FB.
6.Edit the Motion-Dimension FB> Enter |
STEP 5: Add the Cam-Follower.
1.: Click and drag to add the Part
2. Click the CAD-Line along the new Part and the Line in the Base-Part, that will be the sliding-axis of the Cam-Follower.
3.: Click the Slide-Joint, click the start-Point of the sliding-axis of the Line in the Base-Part, and the start-Point of the Cam-Follower Part
4.Click the FB and then the graphic-area.
5.Click the FB and then the graphic-area.
6.Connect wires from the Linear-Motion-FB to the Motion FB and to the Motion-Dimension FB. |
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STEP 6: Edit a Motion for the Slider
Blend-Point
No
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X - Input
Cam-Shaft
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Y - Output
Cam-Follower
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1
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0
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0
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2
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90
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30
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3
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180
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30
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4
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270
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0
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1
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360 / 0
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0
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Add the sketch-loop to the Slider for the Follower-Profile
When the Profile in contact with the cam is from a Circle, we call it a Cam-Follower Roller. When the Profile in contact with the cam is from a Line, we call it a Flat-Faced Follower.
In all cases, the shape of the Follower-Profile must be a . For a Flat-Faced Follower, one of the sketch-elements must be a Line.
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STEP 1: Add the shape for the Flat-Faced Follower.
1.Edit the Cam-Follower - the Slider.
2.Part-Editor: Add a Line that will be in contact with the Cam.
•Add Line with its mid-point at the start-Point of the Slider. You may need to edit the length of line later.
•Line is at an angle relative to the Slide-Joint. In this case it at 80º.
3.Part-Editor: Add three more lines to complete a long, narrow rectangle, with, perpendicular (⊥) sides . The rectangle must be a .
4.Exit the Part-Editor |
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STEP 2: Add a Profile to the sketch-loop
To add the Profile, do:
1.Click
2.Click the long rectangle.
3.Click  in the Command-Manager. |
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Add the 2D-Cam
When you add the 2D-Cam, we always calculate for you the Inner (Internal) and Outer (External) Cams. For a Flat-Faced Follower, we must hide the Outer cam.
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STEP 1: Add a 2D-Cam
To add the 2D-Cam, do:
1.
2.Mechanism-Editor: Click the Cam-Shaft
3.Mechanism-Editor: Click the Profile - the long, narrow rectangle.
4.Click in the Command-Manager
or
4.Right-click the graphic-area |
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You can see in the image, that there are two Cam-Profiles.
There are two Cam-Profiles - the Inner and the Outer
The Inner Cam-Profile contacts the long-side of the Follower-Profile (rectangle).
The Outer Cam-Profile contacts the corner of the Follower-Profile (rectangle).
We hide the Outer Cam-Profile with the 2D-Cam dialog.
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STEP 2: Hide the Outer Cam-Profile
1.Double-click the 2D-Cam.
Or
1.See How to open a dialog
In the 2D-Cam dialog:
2.Select the Display tab
3.Select the Cam-Profile Display
4.Select Inner radio button |
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Trouble-shooting
Does the Cam make contact with the Flat-Faced Follower for the complete rotation of the cam?
Are there 'flats' on the cam?
If a 'flat' appears on the 2D-Cam, you must edit the one or all of these parameters
•Motion-Design for the Slider - Can the Slider move more slowly, or not as far. This may not be an option of course.
•Edit the flat-faced follower shape so that it is longer
•Move the Slider axis nearer to the axis of the Cam-Shaft (but be careful of undercutting)
•Offset the Flat-faced follower (rectangle) to one side of the Slider
On this occasion I have made the Flat-Faced Follower longer.
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