2D-Cams have a number of elements, function-blocks and dialog-boxes that relate to each other. The Action [in the table ] shows how they are related and when to use them.
Action 1A |
... optional ...
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Action 1B Edit 2D-Cam dialog-box |
Action 2A |
Action 2B Edit Cam-Data FB to select a 2D-Cam |
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Action 3A Do Cam-Analysis [with Graph FB] |
Action 3B |
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*Force analysis only: Configure Power Source |
Toolbar : |
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Cam-Data FB |
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Menu : |
Add menu > Add Cam-Data FB |
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What for : |
To analyse a 2D-cam - see below: Cam Analysis To calculate the coordinates of a 2D-cam See also: Add 2D-Cam |
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![]() Cam-Data FB in Graphic-Area |
The Cam-Data FB is now in the graphic-area - see left. |
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Cam-Coordinates dialog-box opens immediately. You must now select a 2D-Cam to link it to the Cam-Data FB. |
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The 2D-Cam becomes linked to the Cam-Data FB . It is the: Selected Cam-Track. |
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See Cam-Coordinates dialog-box OR
See below : Cam Analysis Parameters |
The five output-connectors from the Cam-Data FB provide:
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Drag wires from the output-connectors of the Cam-Data FB to a Graph FB or a Statistics FB In the Graph FB, make sure you select the correct cam [Cam 1 or Cam 2] in the Y–axis display option. Top-Tip: When there is more than one 2D-Cam in the model, it frequently best to add one Cam-Data FB and Graph FB for each 2D-Cam in your model. Connect the same output-connector from each Cam-Data FBs to the same Graph FB. Then, it is easier to compare simultaneously the same analysis parameter [e.g. Pressure-Angle] of up to four 2D-Cams in one graph plot. Make sure to do Configure the Power Source. If Force does not show in the Graph FB, even with the Power Source configured correctly, try the changing the Cam: Cam 1 or Cam 2. If Shear-Stress does not show in the Graph FB, even with the Power Source Configured Correctly, try the changing the Cam: Cam 1 or Cam 2. The Maximum Shear Stress happens to be below the Cam Surface. You must enter the correct material properties for the Cam and the Cam-Follower in the 2D-Cam dialog-box. The calculations we use to calculate the Maximum Shear Stress have assumptions. The most significant assumption is that there is no lubrication, but that there is no friction between the Cam and the Cam-Follower. The Radius-of-Curvature [ROC] of the Cam-Follower is assumed to be 'positive'. If the cam conforms to the cam-follower roller [wraps around], the cam has a 'negative' ROC. If the cam is convex to the cam-follower roller, the cam has a 'positive' ROC. 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 Cam 1 and Cam 2 to Excel, and calculate their average. Also, it is easy to forget which cam is in the Graph plot. Make sure you use the Y–axis Display drop-down box to select the correct Cam.
You need Entrainment Velocity to calculate the Film Thickness of the Lubrication 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 and follower. |
See also : Conjugate Cams FB There are four ways to show and plot the Contact-Force between the Cam and the Cam-Follower. In all four cases, you must do Configure Power Source to calculate Contact-Force and Contact Shear-Stress correctly. Display in the Graphic-Area:
You must analyse whether the force between the cam and the follower is active or not.
Use a Graph-FB:
You must analyse whether the force between the cam and the follower is active or not. The Force is always 'positive'.
Contact-Force is = '0' if Contact-Force ≤ '0'. This is the preferred option if you need to know whether the Cam-Force becomes less than zero. |