Meen 4110 mechanisms design fall 2010 lecture 09
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MEEN 4110 – Mechanisms Design Fall - 2010 Lecture 09. CAM. Chapters Objectives. Up on completion of this chapter, the student will be able to Understand how to design a CAM-FOLLOWER Systems. Cam. Follower. Cam.

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MEEN 4110 – Mechanisms DesignFall - 2010Lecture 09

CAM


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Chapters Objectives

  • Up on completion of this chapter, the student will be able to

    • Understand how to design a CAM-FOLLOWER Systems.


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Cam

Follower


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Cam

  • A cam is a rotating or sliding piece in a mechanical linkage used especially in transforming rotary motion into linear motion or vice versa. It is often a part of a rotating wheel (eg. an eccentric wheel) or shaft (eg a cylinder with an irregular shape) that strikes a lever at one or more points on its circular path. The cam can be a simple tooth, as is used to deliver pulses of power to a steam hammer, for example, or an eccentric disc or other shape that produces a smooth reciprocating (back and forth) motion in the follower which is a lever making contact with the cam.

  • The reason the cam acts as a lever is because the hole is not directly in the centre, therefore moving the cam rather than just spinning. On the other hand, some cams are made with a hole exactly in the centre and their sides act as cams to move the levers touching them to move up and down or to go back and forth.


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Design of Cam Systems

The first stage in designing a cam system is the creation of a displacement diagram. A typical plate cam with an in-line roller follower is shown below with a displacement diagram. This figure shows the following characteristic features.

  • The rise- This is when the follower is moving away from the cam centre. The slope reflects the follower velocity.

  • The dwell- the is the period when the follower is stationary

  • The return - This is when the follower moves back towards the cam centre

  • The base circle on the cam is the smallest full diameter of the cam

  • The prime circle is centered on the cam rotation centre with radius at the follower roller centre when the follower is on the base circle

  • The cam profile is the shaped surface of the cam defining the follower motion
















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Type of Motion Program

  • RF = rise-fall

  • RFD = rise-fall-dwell

  • RDFD = rise-dwell-fall-dwell































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