Edit the Design-Set.
The objectives are to edit the four dimensions in the Design-Set, and
• | Make sure the maximum radius of the smaller cam does not exceed : |
• | Minimize the Pressure-Angle |
We will use a Cam-Data FB and a Graph FB to plot the and the * to find the maximum radius of the Cam.
Note: *
We could also use a Measurement FB to measure between the the centre of the Cam-Shaft and the contact-point between the Cam and the Cam-Roller.
Plot the Cam Radii of Curvature with a Graph:

|
STEP 1: | Edit the 2D-Cam to display the 'smaller' cam. |
The Cam Display and Properties dialog should be open.
2. | Click Cam Display and Properties dialog-box > Display tab > Cam Visibilities > |
You can see you can display: , the , and / or .
We need to know if or is the smaller cam.
The is next to the contact-point between the Cam and the Cam-Roller - it is a number 1 or 2.
In this case, next to the smaller cam there is the number 2.
3. | Click Cam Display and Properties dialog-box > Display tab > Cam Visibilities >. |
|

|
STEP 2: | Add a Cam-Data FB and Graph FB to the graphic-area |

|
1. | Mechanism-Editor: Click , then click the graphic-area. |
|

|
2. | Mechanism-Editor: Click , then click the graphic-area. |
|
We need to link the 2D-Cam in the model with the Cam-Data FB.
4. | Mechanism-Editor: Click the 2D-Cam in the graphic-area (or Assembly-Tree), Click to close the Cam-Data FB |
The 2D-Cam is now linked to the Cam-Data FB.
5. | Mechanism-Editor: Connect the output-connector(3) of the Cam-Data FB to the Y1 input-connector of the Graph FB. |
6. | Mechanism-Editor: Connect the output-connector(4) of the Cam-Data FB to the Y2 input-connector of the Graph FB. |
|

|
STEP 3: | Make sure the plot of the Radius-of-Curvature is for Cam 2 (Note: the default is Cam 1) |
The Graph is now open.
Note:
Each wire has up to 3 data-channels. We can plot one data-channel with each wire we connect to an input-connector of the Graph FB.
To select which data channel we plot, we use the Y-input: Cam-Data drop-down to the right of the plot area in the open Graph.
We need to select for
2. | Click Graph >Y-input data-channel > |
|

|
STEP 5: | Edit the Minimum and Maximum Scales for each Plot. |
Notes: The Y-axis scale for the can have a massive range - from plus to minus infinity.
It is easier to use the plot if we set the Minimum and Maximum values of each Y-input with the Graph Settings.
Set the Maximum and Minimum Radius of Curvature Plot
1. | Graph-Settings > Title and Input Selection > (enter a if you want) |
2. | Graph-Settings > Y-axis : |
3. | Graph-Settings > Y-axis : |
Set the Maximum and Minimum Pressure-Angle
4. | Graph-Settings > Title and Input Selection > |
5. | Graph-Settings > Y-axis : |
6. | Graph-Settings > Y-axis : (update again later as Pressure Angle improves) |
Note: I would normally set the maximum and minimum Pressure-Angle values to ±35. However, the Pressure-Angle is very biased to a large negative value. Hence, we can set a larger range, and reduce it when the Pressure-Angle improves.
7. | Close the Graph-Settings dialog. |
Save your model
|

|