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At which rpm, this CAM mechanism will fail😲?

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Analysis of a Rigid Eccentric CAM

In this analysis, all the components of the cam system are assumed to be rigid and the results are applicable to low-speed systems.

A circular disc cam with the cam shaft hole drilled off center is known as eccentric plate cam. The image shows a simplified reciprocating eccentric cam system consisting of a plate cam, a flat face follower and a retaining spring.

Mechanism Monday ​​​​​​​ TheroryofMachines ​​​​​​​xDesign ​​​​​​​

Create CAM Disc

  • Open Part Design App
  • Edit the 3D Shape
  • Go to Essentials section of the Action bar and select Positioned Sketch
  • Create the following sketch.
  • Go to Model section of the Action bar and select Pad
  • Create a pad of 20 mm.
  • Go to Essentials section of the Action bar and select Point and create a point at origin (0,0,0)

Create Follower

  • Open Part Design App
  • Edit the 3D Shape
  • Go to Essentials section of the Action bar and select Positioned Sketch
  • Create the following sketch.
  • Go to Model section of the Action bar and select Pad
  • Create a pad of 20 mm.
  • Go to Essentials section of the Action bar and select Point and create a point:
    • (0,0,60mm)


Create Frame

  • Open Part Design App
  • Edit the 3D Shape
  • Go to Essentials section of the Action bar and select Positioned Sketch
  • Create the following sketch.
  • Go to Model section of the Action bar and select Pad
  • Create a pad of 20 mm.
  • Go to Essentials section of the Action bar and select Point and create two points:
    • (0,0,220mm)
    • (0,0,0)


Create Assembly

  • Create a Physical Product
  • Insert the Cam Disc, Follower & Frame, and orient them properly
  • Go to Assembly section of the Action bar and select Engineering Connection
    • Create Fix Engineering Connection to the frame
    • Create a Revolute Engineering Connection between frame and the cam disc (Add a Controlled Hinge)
    • Create a Prismatic Engineering Connection between follower and the frame
    • Create a Spring Engineering Connection between frame and the follower.
      • Set

Simulation and Analysis

  • Open Mechanical Systems Design App
  • Go to Mechanical Systems Design section of the Action bar select Contact Connection
    • Create a Contact Connection between follower and cam disc
  • Create a mechanism using Mechanism representation command
    • Test the motion using Mechanism Player
  • Open Mechanical Systems Experience App
    • Note: It will ask to Create a Simulation Object, Click OK
  • Go to Scenario section of the Action bar
  • Create a Law Excitation
    • Select the revolute command of the mechanism as Support
    • Angle Formula: Angle = -(`Excitations\\Law Excitation.1\\Time`* 360deg/1sec)*(0.1*`Excitations\\Law Excitation.1\\Time` /1sec)
  • Create Gravity Excitation
  • Create Position, Speed and Acceleration probe for Point in the Cam Disc with respect to point at the origin of the frame
  • Create a Measure probe between a point on the follower and a point on the frame.
  • Create a Dynamics Scenario with
    • Excitation:
      • Law Excitation
      • Gravity Excitation
    • Probe:
      • Position, Speed and Acceleration 
      • Measurement Between 
    • Parameters:
      • Start Time = 0s
      • End Time = 25s
      • Step Time = 0.01s.
  • Select Compute and Generate Results
  • Select View Scenario Results
  • Select appropriate data and switch to Plot tab to view the graphs.
SimulationPlot

As you can see after reaching certain speed, the follower starts to jump. There will be some impact between the cam and the follower, resulting in a rattling, clicking and noisy operations. This is usually known as jump.

This can be prevented by

  • increasing the preload exerted by the spring or
  • the spring stiffness


Downloadable Cam and Follower CAD and Simulation 3DXML File



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✅ Contact (⭐ friction, collision, etc.)
✅ Gravity ⭐
✅ Axial Spring
✅ Bushing 

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✅ Position Excitation
✅ Velocity Excitation
✅ Force Excitation
✅ Torque Excitation
✅ Sequence of Excitation
✅ Probes (⭐ position, speed, acceleration, joint force, etc.)
✅ Plots
✅ Traces

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