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CAM design

CAM design. What is a cam?. cam and follower. disc cam with flat follower. rocker cam. 4 cycle engine. Our Problem. L 1 = 2” L 2 = 3” α = 120 . Our problem. Design a disc cam (for use with a flat follower) such that: follower height is L 1 when cam angle is 0 °

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CAM design

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  1. CAM design

  2. What is a cam?

  3. cam and follower

  4. disc cam with flat follower

  5. rocker cam

  6. 4 cycle engine

  7. Our Problem L1 = 2” L2 = 3” α = 120

  8. Our problem • Design a disc cam (for use with a flat follower) such that: • follower height is L1 when cam angle is 0° • follower height is L2 when cam angle is  • the relationship between the height, L, and the cam angle, , is linear We need to get the function of the cam profile and then draw a curve in SolidWorks that exactly models this profile.

  9. Determine cam profile equation • Would like to have y = f(x). • We want a linear relationshipbetween L and . L = A  + B Determine A and B. • When  = 0, L = L1; when  = , L = L2 L1 = A (0) + B L2 = A () + B

  10. Cam profile equation A • Now we’ll get the x and y coordof point A (an arbitrary point) xA = L cos yA = L sin substitute for L

  11. Cam profile equation A • We would like to have y as a functionof x. • Instead we have y and x as a function of . This is called a parametric representation of x and y.

  12. Cam profile equation A • Let’s look at a numerical example: L1 = 2” (when  = 0) L2 = 3” corresponding to  = (120°)

  13. Cam profile equation A • Plot the x,y coordinates as  variesfrom 0 to

  14. Cam profile • How do we get this exact curve into SolidWorks? • make a sketch with an equation driven curve (parametric) • button is ‘under’ the spline button

  15. Cam Profile equation driven curve (parametric)

  16. complete the profile

  17. complete the profile

  18. complete the profile

  19. profile working region of cam

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