Barrel Cams: 3 Planes, 3 Mechanism-Editors

Image of Barrel Cam after it has been transferrred to SolidWorks.

Image of Barrel Cam after it has been transferrred to SOLIDWORKS.

With reference to the image to the left:

1r   A Plane for the Cam-Follower and Cam-Follower Roller - offset from the Top Plane*

2r   A Plane for the rotating Barrel-Cam - if possible, make this the Front Plane*

3r   A Plane for the Barrel-Blank - the Right-Plane*


* Preferred Planes if you do not need to include other machine elements.

 

Barrel-RibCam

Rib Cams.

This tutorial designs a Barrel Cam with a Cam-Track, a groove, to guide one roller with a cam-flank on each side of the one roller.

It is also possible to model a Barrel Cam with a Cam-Rib - see image to the left.

In this case, there are two Cam-Rollers, with each Cam-Roller against a different cam-flank.

Contact us, if you need help to model the Barrel Cam with a Cam-Rib.

The Five Elements for a 3D-Cam:

GA-Barrel-011

Note: Before you can see sketches that are in other Mechanism you must do

1.Visibility toolbar > Show other Mechanisms. and
2.Right-click each Mechanism name-tab, and click 'Show background sketch....'.

There are five elements in model before you can do Add 3D-Cam. They are three Mechanism-Editors on three different Planes.

Red-14-1b Cam-Follower Part

Red-14-2 Cam-Roller Profile

Red-14-3 Cam-Shaft Part

Red-14-4 Cam-Blank Profile

Red-14-5 Cam-Blank rotational axis Sketch Line

GA-Barrel-Motion-01

We also need to design the Motion in MotionDesigner.


The Segments are:

Segment 1: X-axis: 0-120, Y-axis: 0-60 : Poly 3-4-5

Segment 2: X-axis: 120-180, Y-axis: 60-60 : Dwell

Segment 3: X-axis: 180-300, Y-axis: 60-0 : Poly 3-4-5

Segment 4: X-axis 300-360, Y-axis: 0-0 : Dwell


tog_minus        1: Add the Cam-Shaft

GA-Index-CamShaft-AddLine


Note: After you start MechDesigner - it is good practice to immediately save the empty 'model' to a new file. Auto-save can also start.


STEP 1: Add the Cam-Shaft ( see example: Tutorial 1 - a rotating-Part )

Add Mechanism-Editor:

1.Model-Editor: Click Model toolbar > Add Mechanism-Editor | Click the Front Plane | Click OK-tiny-11-15 in the Command-Manager
STEP 2: Add Rotating-Part:
2.New Mechanism-Editor: Edit the Base-Part.
3.Part-Editor: Geometry toolbar > Add Line.
4.Part-Editor: Constraints toolbar > Add Coincident | Click Line's start-Point and X-axis | Do again, Line's start-Point and Y-axis.
5.Part-Editor: Constraints toolbar > Add Horizontal | Click the Line
6.Part-Editor: Geometry toolbar > Add Dimension to the Line. Make it ~100mm. Exit Part-Editor.
7.Mechanism-Editor: Kinematic elements toolbar > Add Part | Edit the Part | In Part-Editor: Edit its length to 60mm. Exit the Part-Editor.
8.Mechanism-Editor: Kinematic elements toolbar > Add Pin-Joint | Click the start-Point of Part and start-Point of Line in Base-Part
9.Mechanism-Editor: Kinematic FB toolbar > Add Motion-Dimension FB | Click the Pin-Joint , Line in the Base-Part , CAD-Line in Part, Click OK-tiny-11-15 in the Command-Manager.
10.Mechanism-Editor: Edit the Motion-Dimension FBRed-14-1b, enter Base-Value = 0º .
11.Mechanism-Editor: Kinematic FB toolbar >Add Linear-Motion FB | Connect wires between the Linear-Motion FB and Motion-Dimension FB.
12.Rename the Mechanism-Editor to Cam-Shaft, the Part to Cam-Shaft, and the Plane you selected for the mechanism to Cam-Shaft.

GA-Barrel-001

tog_minus        2: Add the Cam-Follower

GA-Barrel-002

Save your model

STEP 1: Add the Cam-Follower ( see example: Tutorial 1 - an Oscillating-Part )

Add new Plane and Mechanism-Editor

1.Model-Editor: Click Model toolbar > Add Plane
2.Add Plane dialog-box: Click the Top Plane | Offset Distance = 100 | Click OK-tiny-11-15 to exit the Plane dialog-box.
3.Model-Editor: Click Model toolbar > Add Mechanism | Click the new PlaneRed-14-1b| Click OK-tiny-11-15 in the Command-Manager
4.Mechanism-Editor: Rename the new Plane to Cam-Follower and the the new Mechanism-Editor to Cam-Follower

GA-Barrel-003

Do Visibility toolbar > Show Other Mechanisms

To the left, the view is rotated to show the relative positions of the:

Cam-ShaftRed-14-2 in Mechanism Cam-Shaft
Base-PartRed-14-3 of the new Mechanism Cam-Follower

However, it is easier to add the elements to the Front View.

To show the Mechanism from the Front-View : Do View toolbar > Front-View, or F3

GA-Barrel-004

STEP 2: Add a Line to the Base-Part
1.New Mechanism-Editor: Edit Base-Part.
2.Part-Editor: Geometry toolbar > Add Line.
3.Part-Editor: Constraints toolbar > Add Coincident | Click Line's start-Point and X-axis
4.Part-Editor: Constraints toolbar > Add Horizontal | Click the Line
5.Part-Editor: Geometry toolbar > Add Dimension | Click the Line's start-Point and the Y-axis | Enter 100mm. Exit Part-Editor.
6.Part-Editor: Geometry toolbar > Add Dimension | Click the Line | Enter 50mm. Exit Part-Editor.

GA-Barrel-005

STEP 3: Add the Cam-Follower Rotating-Part (Oscillating)
1.Mechanism-Editor: Kinematic elements toolbar > Add Part | Edit the Part
2.Part-Editor: Edit | Edit length = 105mm.
3.Mechanism-Editor: Kinematic elements toolbar > Add Pin-Joint | Click the start-Point of Part and start-Point of Line
4.Mechanism-Editor: Kinematic FB toolbar > Add Motion-Dimension FB | Click the Pin-Joint, new Line, CAD-Line in Part, Click OK-tiny-11-15 in the Command-Manager.
5.Mechanism-Editor: Edit the Motion-Dimension FBRed-14-1b, enter Base-Value = -30º (330 in the image)
6.Mechanism-Editor: Click Kinematic FB toolbar >Add Linear-Motion FB , Click the graphic-area
7.Mechanism-Editor: Click Kinematic FB toolbar >Add Motion FB , Click the graphic-area
8.Mechanism-Editor: Connect wires between the Linear-Motion FB and the Motion FB, and then the Motion-Dimension FB.
9.Mechanism-Editor: Rename the Part to Cam-Follower

<<< The new names and hierarchy of the important-elements in the Assembly-Tree

Save your model

AT-Barrel-006

tog_minus        3: Add the Cam-Roller

AT-Barrel-005A

Save your model

STEP 1: Add the Cam-Roller to the Cam-Follower-Part
1.Mechanism-Editor: Edit the Cam-Follower Part
2.Part-Editor: Geometry toolbar > Add Circle
3.Part-Editor: Geometry toolbar > Add Dimension | Click the Circle | Enter 20mm (Radius)
4.Part-Editor: Constraints toolbar > Add Coincident | Click Circle's centre-Point and the end-Point of the CAD-Line
5.Exit Part-Editor

GA-Barrel-007

STEP 2: Add and Edit the Cam-Roller Profile
1.Mechanism-Editor: Solids toolbar > Add Profile | Click the Circle, Click OK-tiny-11-15 in the Command-Manager
2.Mechanism-Editor: SHIFT+CLICK the Profile

The Profile and the Extrusion should be in the Selection-Window

3.Selection-Window: Right-Click the Extrusion | Click Edit element in the contextual menu
4.Extrusion dialog-box: Enter Extrusion Depth = 20 | Extrusion Offset = -20 | Click OK-tiny-11-15 to close the dialog-box.
5.Save your model

 

GA-Barrel-008

The Model after STEP 2

Do Visibility toolbar : Show other Mechanisms and Do Visibility toolbar > Show Model in Mechanisms

Rotate the view: 1: Click in the Selection-Window | 2: Click the up-down and left-right arrow keys on your keyboard.

The image shows the

Red-14-1b Cam-Shaft Part

Red-14-2 Cam-Follower Part

Red-14-3 Cam-Roller Profile

 

tog_minus        3: The Cam-Blank and Rotational Axis

GA-Barrel-009

Cam-Blank : the material before we cut the Cam-Track. It is a sketch-loop of the rotational-section of the Cam-Blank.

Rotational-Axis: The section of the Cam-Blank has a rotational-axis. SolidWorks, (when we send the Cam-Blank to SolidWorks) uses the rotational-axis to revolve the section.

The sketch-loop is in a new Mechanism-Editor.

STEP 1: Add a new Mechanism-Editor for the Cam-Blank
1.Model-Editor: Model toolbar > Add Mechanism | Click the Right-Plane | Click OK-tiny-11-15 in the Command-Manager.

In the new Mechanism-Editor is VERY helpful to do

Visibility toolbar > Show Model in Mechanism

Also add the sketch from the Front-View (View toolbar > Front-View)

GA-Barrel-010

1.New Mechanism-Editor: Edit the Base-Part.
2.Part-Editor: Geometry toolbar > Add Line (× 4) to give a rectangle.
3.Part-Editor: Constraints toolbar > Add Perpendicular (× 3) to give a rectangle.
4.Part-Editor: Constraints toolbar > Add HorizontalRed-14-1b | Click one of the two Lines that should be parallel with the X-axis.
STEP 2: Add a new Mechanism-Editor for the Cam-Blank
1.Part-Editor: Geometry toolbar > Add LineRed-14-2
2.Part-Editor: Constraints toolbar > Add Horizontal | Click the Line
3.Part-Editor: Constraints toolbar > Add Coincident | Click the start-Point of the Line and the X-axis
4.Exit Part-Editor

 

GA-Barrel-011

STEP 3: Add a Profile to the new sketch-loop
1.Mechanism-Editor : Click Solids menu > Add Profile | Click the sketch-loop of the Cam-Blank | Click OK-tiny-11-15 in the Command-Manager
2.Mechanism-Editor: SHIFT+CLICK the Profile

The Profile and the Extrusion should be in the Selection-Window

3.Selection-Window: Right-Click the Extrusion | Click Edit element in the contextual menu
4.Extrusion dialog-box: Enter Extrusion Depth = 2 | Extrusion Offset = -1
5.Extrusion dialog-box: Enter Colour, Opacity, Quality > Visible check-box to hide the Extrusion.
6.Click OK-tiny-11-15 to close the dialog-box.
7.Save your model

The Model is ready to add the 3D-Cam

Tutorials and Reference Help Files for MechDesigner and MotionDesigner 14.2 + © Machine, Cam, Mechanism, and Motion Design Software by PSMotion Ltd