h Cam Toy Review A number of mechanisms are drawn on your handout.

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Presentation transcript:

h Cam Toy Review A number of mechanisms are drawn on your handout. CHAIN AND SPROCKET SYSTEM LINKAGES LEVERS SPUR GEARS PULLEY SYSTEM DROP CAM SCREW THREAD RACK AND PINION SPRING U3b-L8

ONE CYCLE: DWELL: THE RISE: A CAM has two parts, the FOLLOWER and the CAM PROFILE. KEY PHRASES ONE CYCLE: One rotation/revolution of the cam. DWELL: When cam rotates but the follower does not rise or fall. THE RISE: That part of the cam that causes the follower to rise. What do you think is the 'FALL' ?

Types of Profiles – Put into notes 1. PEAR SHAPED CAM - Used on shafts of cars. 2. DROP CAM. As the drop cam rotates the follower stays level for a short time. It then rises slowly and suddenly drops.

3. ECCENTRIC CAM. The follower moves up and down in a vertical direction. Its movement is very smooth. These cams are used in steam engines. 4. SWASH CAM. This cam is like a ‘spinning top’. As the angled disc rotates the follower rises and falls, following the movement of the disc.

ANSWERS 5. BOX CAM. As the disc (cam) rotates, the follower - follows a groove cut into the disc. 6. FLAT PLATE CAM. The follower rises and falls according the movement of the cam profile , as it travels from left to right.

CLASSWORK/Homework December 8, 2010 U3b-L8 CLASSWORK/Homework December 8, 2010 Individually fill out Cam Toy sheet. The assignment will be turned in on Monday and the toy will be tested Finish decorating toy. Study for test. Candy will be given to best groups in test review

U3b-L8 TEST REVIEW What are the 5 major components to technological systems? Can you represent them in a flow chart? 7 inputs? 3 types of materials? 8 constraints? 4 design principles? Risk analysis, System, Criteria, Constraint, Prototype, Engineering Do you understand the 12 steps of the Design Process?