Theory of Machine
The maximum or minimum value of the swaying couple is

± a (1 - c) m.ω².r
± 2a (1 - c) m.ω².r
± (a/√2) (1 - c) m.ω².r
± c.m.ω².r

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Theory of Machine
Hammer blow

Varies as the square root of the speed
Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses
Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.
Varies inversely with the square of the speed

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Theory of Machine
In a four bar chain or quadric cycle chain

Three are turning pairs and one is a sliding pair
Two are turning pairs and two are sliding pairs
Each of the four pairs is a turning pair
One is a turning pair and three are sliding pairs

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Theory of Machine
In elliptical trammels

Three pairs turning and one pair sliding
One pair turning and three pairs sliding
All four pairs are turning
Two pairs turning and two pairs sliding

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