Design & Technology: March 2008

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Yu Ting
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Tuesday, March 4, 2008

Circular cam

A circular cam is also known as an 'eccentric' cam. The centre of rotation of the cam is offset from the centre of the circle.

Pear shaped cam

A pear shaped cam has a long dwell period during which time the follower does not move. This is ideal for the 'Sailing Ship' model where various parts move in sequence as the crank is turned.

Triangular Cam

Followers working with triangular cams do not have a dwell period like other cams. This means they move continuously as the cam turns. Triangular cams are found in mechanisms that use clapping movements, e.g. Perky Porky.

T-rex

Crocodile

Caterpillar

Cat