Cam-Data FB

See also: Add 2d-Cam

IMPORTANT : Cam Contact-Force and Contact-Stress...

When you want to analyze the Cam-Force and Contact-Stress, it is important that the model represents the power flow between the cam and the cam-follower correctly.

You must correctly configure the power flow from the 'driving' cam to the 'driven' cam-follower and payload.

See Configure Power Source

2D-Cams have a number of related elements, Function-Blocks and dialog-boxes. Their relationships are indicated in the table below.

hmtoggle_plus12D-Cam : Related Elements and Actions

Action 1A

Add 2D-Cam

... optional ...


Action 1B

Edit Cam Display and Properties dialog-box

Action 2A                

Add Cam-Data FB

Action 2B

Edit Cam-Data FB to select a 2D-Cam

Action 3A

Do Cam-Analysis [with Graph FB]

The output-connectors of Cam-Data FB:

Entrainment Velocity

Action 3B

Calculate Cam-Coordinates as Points or Arcs

Save as:

Transfer directly to SOLIDWORKS

*Force analysis only: Configure Power Source

Cam-Data FB dialog-box

After you add a Cam-Data FB to the graphic-area, you must link it to a 2D-Cam element.

The output-connectors from the Cam-Data FB provide kinematic [geometry related] and kinetostatic [force related] data at its four output connectors for the 2D-Cam.

Also: the Cam-Data FB dialog-box has the tools to calculate cam coordinates with different formats.

Add CamData FB

Kinematic FB toolbar [right] > Cam-Data FB


Add menu > Add Cam-Data FB

What for:

To analyse 2D-Cams - see Cam Analysis

To calculate 2D-Cam Coordinates


STEP 1.Edit the Cam-Data FB to open the Cam-Coordinates dialog-box
1.Double-click the Cam-Data FB to open the Cam-Data FB dialog-box

- or -

...see How to open a Dialog-Box


Cam-Coordinates Data dialog-box opens immediately.


Selected Cam-Track box1s-red: is Orange before you select a 2D-Cam from the model.


STEP 2.Link a 2D-Cam to the Cam-Coordinates dialog-box.

With the Cam-Coordinates dialog-box open:

1.Click a 2D-Cam element in the graphic-area or the Assembly-Tree

The 2D-Cam is now in the Selected Cam-Track 1sbox.


Selected Cam-Track box1s-red: The 2D-Cam in the model becomes linked to the Cam-Data FB and shows as the: 'Selected Cam-Track'

Cam-Coordinates toolbar2s: The toolbar becomes colorized and active.

You can use the toolbar icons to calculate Cam-Coordinates -see Cam-Coordinates dialog-box -

Or close the dialog, to calculate the cam-coordinates later.

Cam Analysis data becomes available at the output-connectors of the Cam-Data FB.


Cam Analysis Output-Connectors

The output-connectors from the Cam-Data FB make available four analysis parameters.

F   :  Contact Force : Contact Force when a positive value, but 0N when a negative value - Cam 1 and Cam 2.
Ԏ  :  Contact Maximum Shear Stress : Cam 1 and Cam 2.
ρ  :  Radius-of-Curvature : Cam 1 and Cam 2.
μ  :  Pressure Angle
Ue : Entrainment Velocity

Connect wires from the Cam-Data FB to a Graph FB or Stats FB.

Use the Y-axis Data-Type in the Graph FB to select the internal or external cam especially to analyse Maximum Contact Shear Stress and Radius-of-Curvature.

You can export the data for from the Graph FB. further analysis, to Microsoft Excel®

When there are many 2D-Cams controlling the motions of mechanisms with interacting tooling, you will usually need to optimize all of the axes together. I usually use one Graph FB to plot the data at the same output-connector for up to four 2D-Cams and Cam-Data FBs.

I also use the same minimum and maximum scaling for all inputs to the one Graph FB.

E.g.: I plot the Pressure-Angles for up to four 2D-Cams in one Graph FB, and say ±40º as a Maximum and Minimum. Then, it is easier for me to review the Pressure-Angles of all four cams together. I can more easily make sure that one cam does not have a low Pressure-Angle, while another then must have a large Pressure-Angle.

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