Chebyshev's Lambda Mechanism

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Chebyshev's Lambda Mechanism
Tchebyshevs plantigrade machine
Lambda Mechanism

The Chebyshev's Lambda Mechanism[1] is a four-bar mechanism that converts rotational motion to approximate straight-line motion with approximate constant velocity.[2] The precise design trades off straightness, lack of acceleration, and the proportion of the driving rotation that is spent in the linear portion of the full curve.[3]

The example to the right spends over half of the cycle in the near straight portion.

The Chebyshev's Lambda Mechanism is a cognate linkage of the Chebyshev linkage.

The linkage was first shown in Paris on the Exposition Universelle (1878) as "The Plantigrade Machine".[4][5]

The Chebyshev's Lambda Mechanism looks like the Greek letter lambda, therefore the linkage is also known as Lambda Mechanism.[6]

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