1.Add a 2D-Cam - see Add 2D-Cam
IF the new 2D-Cam is a Conjugate-Cam or a Groove-Cam (or other Body-Closed Cam):
1.a. Add a Conjugate-Cam FB - see Add Conjugate Cam FB
1.b. Edit the Conjugate-Cam FB - add 2×flanks from 2×2D-Cams - see Conjugate-Cam dialog-box.
2.Select the 2D-Cam or the Conjugate-Cam as the Power Source for the Follower - see Configure-Power Source
3.Review the 2D-Cam : Display, Properties, Life, ... - see below
4.Add a Cam-Data FB - see Add Cam-Data FB
5.Edit the Cam-Data FB to link it to the 2D-Cam- - see Link the Cam-Data FB to a 2D-Cam
6.Connect wires from the Cam-Data FB to a Graph FB to analyse 5 parameters - YOU ARE HERE:
7.Edit the Cam-Data FB again to Calculate the Cam-Coordinates - see Cam-Coordinates dialog
Before you can analyze a 2D-Cam, you must link it to a Cam-Data FB.
See Cam-Data FB to add.
In the graphic-area of the Mechanism-Editor:
A 2D-Cam now has a link with a Cam-Data FB.
Now, you can connect wires for the output-connectors of the Cam-Data FB to analyze the 2D-Cam.
Analysis Parameters from Cam-Data FB
The five output-connectors from the Cam-Data FB provide:
•F : Contact Force : See Note 1
•Ԏ : Contact Maximum Shear Stress : See Note 2
•ρ : Radius-of-Curvature : See Note 3
•μ : Pressure Angle : See Note 4
•Ue : Sliding Velocity - see Note 5
Make sure you select the correct cam (Inner, Outer, Pitch-Center Path) in the Y–axis display option of the Graph FB interface.
Connect the same output-connector and parameter (e.g. Pressure-Angle) from different Cam-Data FBs to the same Graph FB. Then you can analyse the same parameter for up to 4 × 2D-Cams in one graph plot.
Set the Minimum and Maximum Values to be the same for all graphs. Then it is even easier to compare the same parameter for each 2D-Cam.
Note 1: Make sure to do Configure the Power Source.
If Contact-Force does not show in the Graph FB, even with the Power Source configured correctly, change the Cam from Inner to Outer, or vice versa, in the Graph FB > Y-axis Options.
Make sure to do Configure the Power Source.
If Shear-Stress does not show in the Graph FB, even with the Power Source configured correctly, change the Cam: Inner to Outer, or vice versa, in the Graph FB > Y-axis Options.
The Maximum Shear Stress is below the Cam surface. The Maximum Shear Stress is a function of the material properties of the contacting bodies
•Cam: taken from the Steel Selection in the Cam-Life tab of the 2D-Cam dialog-box.
There calculations have assumptions. The most significant assumption is that friction is zero, and the bodies are perfectly smooth.
By convention, the Radius-of-Curvature (RoC) of a Roller is positive.
When the cam is convex relative to the Roller, the RoC of the cam is positive.
When the cam is concave relative to the Roller, the RoC of the cam is negative.
Radius-of-Curvature of the Pitch-Curve is not available. If you need to know the Radius-of-Curvature of the Pitch-Curve, export the Radius-of-Curvature of the Inner and Outer cams to Excel, and calculate their average.
The Pressure Angle is through the center of the Cam-Follower. There are two other Pressure Angles available: the Contact Pressure Angle of the Inner and Outer Cams - these are labeled as Inside Cont. PR, Ang. in the Graph FB > Y-axis display options.
These should be used with a Flat-Faced Follower only.
We cannot calculate Pressure Angle for a Stationary Cam.
Use Sliding-Velocity to calculate the Film Thickness of the lubricating oil between the Cam-Follower and Cam. If you know the surface finish of the cam and cam-follower, then you can also calculate the Film Thickness Ratio. This is an important parameter to calculate as it strongly influences the life of the cam.
Sliding Velocity = (Velocity of Cam Surface - Velocity of Cam-Follower Surface)
Entrainment Velocity = (Velocity of Cam Surface + Velocity of Cam-Follower Surface) ÷ 2
Slip-Slide-Ratio = Sliding-Velocity ÷ Entrainment Velocity
If the cam is Body-Closed (e.g. a Conjugate-Cam, or Groove-Cam) then you must add 2 × 2D-Cams and a Conjugate Cam FB.
See more : Conjugate Cams FB
You must do Configure Power Source to calculate correctly the Contact-Force and Contact Shear-Stress.
There are four methods to show the Contact-Force between the Cam and the Follower.
Display in the Graphic-Area:
1.Forces toolbar > Display Force Vectors button.
Two equal and opposite Force-Vectors will radiate from the Contact-Point between the Cam and Follower. They are
•the force that ACTS-ON the Follower and Follower-Part
•the force vector that ACTS-ON the Cam and Cam-Part.
You must analyze whether the force between the cam and the cam-follower is active or not active.
Plot with a Graph-FB:
3.Add a Force-Data FB, edit it select the 2D-Cam as the Force element, plot with a Graph FB.
4.Use the Cam-Data FB to plot Contact Force from the top output-connector with a Graph FB.
Contact-Force is = 0 N if Contact-Force ≤ 0 N.
This is the preferred option if you need to know whether the Cam-Force becomes less than zero.