+ Altering linear motions

+ Altering rotary oscillations

+ Complicated motions

+ Continuous rotation into interrupted rotation

+ Continuous rotation into linear motion

+ Continuous rotation into rotary oscillation

+ Continuous rotation transmission

+ Jigs and fixtures

+ Mechanisms for drawing lines

+ Mechanisms of specific purposes

+ Reciprocating motion to continuous rotation

+ Rotary oscillation into linear motion

+ Rotation to wobbing motion

+ Simple cam mechanisms (RU)

+ Study of mechanisms

+ Sundries

Polar planimeter 1


Instrument for determining the area (F) of an arbitrary twodimensional shape (in red). Move stylus B along the periphery of the shape (one complete round), the green roller gives two values:
B1: initial position angle (in radians)
B2: final position angle (in radians)
F = L.R.(B1-B2)
L = BC R:
radius of rolling circle of the green roller. The roller rotation axis must be parallel to BC. Mathematical basis of the mechanism: intergration in polar coordinates. There must be sufficient friction between the green roller and the ground to prevent slipping. In real planimeters there is reduction gear drive to ease reading angle values.

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