The Objective of this Step is to:

Show you how to add a Polyline and a Profile to a 2D-Cam.

Note: You do not need to do this step to get Cam-Coordinates.

Do this step only if you want to:

Model the Cam as a Solid.

For example, if you want to check the model for collisions.

Know the Mass Properties: Mass, Centre-of-Mass, and Moment-of-Inertia of the Cam.

For example, if you want to balance the Cam.

Include the Mass Properties in a Force Analysis.

Summary of this Step:

Use these commands.

1.Move the model to 0º with the Home key on your keyboard
2.Add Polyline to the 2D-Cam
3.Add Profile to the Polyline
4.Add sketch-loops and Profiles

tog_minusStep 1: Add the Polyline to the 2D Cam


STEP 1: Click Home key on your keyboard to make the Master-Machine-Angle = 0.

Why Home? The Polyline may not be at the same Machine-Angle as the 2D-Cam

STEP 2: Click : Solids toolbar > Add Polyline
- or -
Add menu > Mechanism sub-menu > Solids sub-menu > Add Polyline


The Command-Manager suggests:

Click a '2D-Cam' or 'Gear-Pair'. Use the Polyline as a sketch for a Profile/Extrusion.

STEP 3: Click the 2D-Cam


You can click the 2D-Cam1s-red in:

the graphic-area

- or -

the Assembly-Tree


STEP 4: Click OK-tiny-13-17 in the Command-Manager

If you edit the model, the shape of the 2D-Cam changes.

When you edit an element in the model, it is possible that the shape of the 2D-Cam changes. However, MechDesigner does NOT update the Polyline.

You must update the shape of the Polyline to become the same as the shape of the 2D-Cam.

To update the Polyline:

1.Click the Selection-Window
2.Click the Home key to put the MMA = 0.
3.Click Add Polyline again.
4.Click the 2D-Cam that you want to update.
5.Click OK-tiny-13-17 in the Command-Manager.

MechDesigner updates the existing Polyline. It does not add a new Polyline.

tog_minusStep 2: Add a Profile to the Polyline


STEP 1: Click the Selection-Window
STEP 2: Click the Home Key on your keyboard to put the MMA = 0
STEP 3: Click Add menu > Mechanism sub-menu > Solids sub-menu > Add Profile [or see Solids toolbar]



STEP 4: Click the 2D-Cam in the graphic-area

In the Command-Manager, you should see the Polyline in the selection-box.

STEP 5: Click OK-tiny-13-17 in the Command-Manager
Assembly-Tree with 2D-Cam, with Profile/Extrusion element.

Assembly-Tree with 2D-Cam, with Profile/Extrusion element.

Look in the Assembly-Tree again.

If you expand Part, to which you have added the 2D-Cam, we see these elements:

Cam-Plate [a child to the Part)]
o2D-Cam [as a child to the Cam-Plate, with a OK-tiny-13-17 to indicate it is a good cam [in this case]]

Note: It is your decision as to whether the 2D-Cam is 'OK' or 'Not OK'.

Profile [as a child to the Part]
oExtrusion [as a child to the Profile]

MechDesigner does not list the Polyline in the Assembly-Tree. If you click the 2D-Cam in the graphic-area, you will see the Polyline elements in the Selection-Window.

tog_minusStep 3: Add Profiles or Auto-Profiles to other Parts

To add sketch-elements manually, use the Part-Editor to add sketch-loops.

Note: Do not merge end-Points or centre-Points of Circles and Arcs with Points that you also use for Pin-Joints.


Add Auto-Profiles to Parts in a kinematic-chain with the Add Auto-Profiles tool.

STEP 1: Click Solids-toolbar > Add Auto-Profiles
STEP 2: Click OK-tiny-13-17 in the Command-Manager

'Layer' the Profiles by different amounts along the Z-axis of their Parts.

STEP 3: Click Solids-toolbar > Auto-Layer

View the mechanism in the Model-Editor.

STEP 4: Click the Model name-tab at the top of the graphic-area.

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