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Cams and cam followers teacher

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Teaching resource to demostrate the different types of Cams and followers

Published in: Automotive

Cams and cam followers teacher

  1. 1. Cams and Cam Followers
  2. 2. What are cams?
  3. 3. What are cams? Cams convert rotary oscillating or linear motion into a linear or reciprocating action to carry out useful work.
  4. 4. Types of cams
  5. 5. Types of cams <ul><li>Plate cam </li></ul>
  6. 6. Types of cams <ul><li>Plate cam </li></ul><ul><li>Cylindrical cam </li></ul>
  7. 7. Types of cams <ul><li>Plate cam </li></ul><ul><li>Cylindrical cam </li></ul><ul><li>Face cam </li></ul>
  8. 8. Types of cams <ul><li>Plate cam </li></ul><ul><li>Cylindrical cam </li></ul><ul><li>Face cam </li></ul><ul><li>End cam </li></ul>
  9. 9. Types of cams Plate cam Sometimes called a disc, radial or edge cam. Made up of a flat plate or disc with an edge profile to transmit motion.
  10. 10. Types of cams Plate,Wedge or Disc cam
  11. 11. Types of cams Cylindrical cam Sometimes called a barrel cam. It’s curved surface has a groove machined, within which a follower is contained. The movement is parallel to cam axis.
  12. 12. Types of cams Cylindrical cam
  13. 13. Types of cams Face cam In its flat surface, this rotary cam has a groove cut within which a constrained follower moves. The groove ensures no need for a return spring.
  14. 14. Types of cams Face cam
  15. 15. -Types of cams End cam In this case the end of the cylindrical cam has the profile machined on the end.
  16. 16. Types of cams End cam
  17. 17. Types of cam follower
  18. 18. Types of cam follower Wedge or Knife type This has the advantage that it can follow complicated profiles. However, it is not often used as it wears rapidly, due to the high frictional forces. It can also track profiles in both directions.
  19. 19. Types of cam follower Wedge or Knife type
  20. 20. Types of cam follower Roller This has the advantage that wear is minimised, due to the roller action. However, the profile of the cam and roller radius must not conflict. If the profile is smaller than the radius of the roller then the roller will follow the incorrect path.
  21. 21. Types of cam follower Roller
  22. 22. Types of cam follower Flat ended This cannot be used for concave profiles. It wears slower than a knife-edge follower, since the points of contact move across the surface of the follower. These are often offset and allowed to spin.
  23. 23. Types of cam follower Flat ended
  24. 24. Questions <ul><li>List three applications of different types of cams. </li></ul><ul><li>What could be used today instead of cams? (Think of CNC machines.) </li></ul><ul><li>What materials could be used for cams? </li></ul><ul><li>You have 10 min’s. </li></ul><ul><li>Discuss between yourselves </li></ul>
  25. 25. The cam motion or profile
  26. 26. The cam motion or profile The motion of the cam follower depends upon the profile or shape of the cam. Therefore the profile determines the resultant action. Cams are expensive to make and therefore the cam follower is normally sacrificial - allowed to wear.
  27. 27. Types of cam profiles
  28. 28. Types of cam profiles Three Types
  29. 29. The cam profiles <ul><li>Three Types </li></ul><ul><li>Uniform velocity </li></ul>
  30. 30. The cam profiles <ul><li>Three Types </li></ul><ul><li>Uniform velocity </li></ul><ul><li>Uniform acceleration and retardation </li></ul>
  31. 31. The cam profiles <ul><li>Three Types </li></ul><ul><li>Uniform velocity </li></ul><ul><li>Uniform acceleration and retardation </li></ul><ul><li>Simple Harmonic Motion </li></ul>
  32. 32. The cam profiles
  33. 33. The cam profiles
  34. 34. The cam profiles
  35. 35. LETS DRAW A PROFILE!
  36. 36. LETS DRAW A PROFILE! Draw a cam displacement diagram for the following cam: This cam needs to rise for 50 mm and fall 50mm due to uniform velocity.
  37. 37. LETS DRAW A PROFILE! Draw a cam displacement diagram for the following cam: This cam needs to rise for 50 mm and fall 50mm due to uniform velocity. Repeat this cam but rise due to SHM and fall using uniform acceleration and retardation
  38. 38. The cams, followers and profiles? Homework Questions? Name 3 types of cam Name 2 types of follower Describe uniform acceleration and retardation. Name the other types of profile

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