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Sai Cam

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Sai Cam

  1. 1. welcome
  2. 2. Aim : seminar on any topic of 4 th semester Name: hadolikar s.l Branch: ME Ro.no.1027
  3. 3. Subject: theory of machines Topic : cam & followers
  4. 4. Concept & definition of cam followers A cam is rotating a machine element which gives reciprocating or oscillating motion to the another element know as follower. The cam & follower has a point or line contact constitute a higher pair.
  5. 5. classification of foollowers According to surface contact 1 . Knife edged follower
  6. 6. roller follower
  7. 7. flate face follower
  8. 8. spherical follower
  9. 9. ossciating or rotary follower According to motion of the follower
  10. 10. According to the path of motion of the followers Offset follower
  11. 11. classification of cam 1 radial cam 2 cylindrical cam 3 wedge cam
  12. 12. Cylindrical cam
  13. 13. Wedge cam
  14. 14. box cam
  15. 15. App. of cam & follower 1 .The most well known use of cams is in car engines. The Cam operated valve system can be found in modern car engines and incorporates a number of cams; the valves are opened by cams, four- and six-lobed cams govern the spark distribution and many car petrol oil pumps are cam driven.
  16. 16. 2 . These are used in wall clock 3 . These are used in feed mechanism In automatic lathe machine 4. These are used in paper cutting machine. 5 . It is use in textile machine
  17. 17. Cam terminology <ul><li>The cam terminology used for drawing cam profile & displacement diagram . </li></ul><ul><li>First we know the terms . </li></ul><ul><li>Base circle: It is the smallest circle can be drawn to the cam profile. </li></ul><ul><li>Trance point: It is the reference point of the follower & is used to generate a pitch curve . </li></ul>
  18. 18. <ul><li>Pressure angle : It represent include the angle at any point on the pitch curve between line or motion of the follower & normal to that point on the cam profile . </li></ul><ul><li>Pitch point : It is the point on the pitch curve having maximum pressure angle </li></ul><ul><li>Pitch circle : It is a circle drawn from the center of the cam through the pitch point. </li></ul><ul><li>Prime circle : it is the smallest circle can be drawn from center of the cam & tangent to pitch curve . </li></ul>
  19. 19. <ul><li>Cam angle : it is the angle of rotation of the cam for a definite displacement of the followers </li></ul><ul><li>Cam profile : it is the actual working surface of the cam with which the surface of the follower is always in contact it transmit the required motion to the follower. </li></ul>
  20. 21. Types of motion of the follower <ul><li>Uniform velocity or uniform motion. </li></ul><ul><li>simple harmonic motion. </li></ul><ul><li>uniform acceleration & retardation. </li></ul>
  21. 22. <ul><li>Uniform velocity or uniform motion. </li></ul>
  22. 23. simple harmonic motion
  23. 24. uniform acceleration & retardation
  24. 25. <ul><li>Prob 1: draw the profile of disc cam to given uniform velocity motion to the knife edged follower during outstroke of 60mm during 1 st half revolution. The follower again turns to its original position with velocity during next half of three revolution . The minimum radius of the cam is 50mm & diameter of the cam shaft is 35mm. The axis of follower passes through the axis of the cam. </li></ul>
  25. 26. Given data: out stroke of follower (s)=60mm Minimum radius of the cam =50mm diameter of the cam shaft = 35mm Angle of outstroke=180 angle of return stroke=180
  26. 27. thank you

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