DRWG120_Cams - Cams TOPICS Types of Cams Types of Cam...

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Cams
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Cam Nomenclature Cam Motions TOPICS Cam Drawing Types of Cam Followers Types of Cams Cam Applications
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3 A cam is a machine element designed to generate a desired motion in a follower by means of direct contact. Cams are generally mounted on rotating shafts. Able to produce a given motion, velocity, or acceleration during a specific portion of a cycle.
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4 Types of Cams Plate Cam Face Cam Combination Drum and Plate Cam Plate Cam Conjugate Cam Globoidal Cam
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5 Types of Cam Followers Flat Face Follower Radial Followers Swing Follower Closed-Cam Follower Conjugate Swing Arm Dual-Roller Followers Conjugate Radial Dual-Roller Followers Spring-loaded Conjugate Cam Rollers Index Cam Follower
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6 Cam Roller Followers Round/knife edge follower: Simple structure but easy to wear, for use in instrument Flat follower: For high speed motions Roller follower: Withstand wear, wide applications
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7 Cam Nomenclature Follower displacement The position of the follower from a rest position at a specific time Cam displacement The cam motion measured from a rest position at a specific time Cam profile The actual working surface contour of the cam Base circle The smallest circle drawn on the cam Trace point The center point of the follower Prime circle the smallest circle drawn by the follower
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8 Cam Nomenclature Pitch curve The locus of successive positions of the trace point as the cam rotates Pressure angle the angle between the normal to the pitch curve and the instantaneous direction of motion of the follower Pitch point the position on the pitch curve where the pressure angle is maximum Pitch circle the circle which passes through the pitch point Transition point the position of maximum velocity, where acceleration changes from plus to minus.
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9 Cam Size It depends on the pressure angle the curvature of profile the camshaft size Maximum pressure angle should be limited to 30°~ 35° Always use the smallest possible roller
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10 Cam Motions
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This note was uploaded on 02/02/2012 for the course DRAW 101 taught by Professor Laosimkim during the Spring '11 term at University of Macau.

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DRWG120_Cams - Cams TOPICS Types of Cams Types of Cam...

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