Build linkages with pins, sliders, cams and gears, add a motor and watch them move. The tool computes the degrees of freedom (Grübler), the Grashof condition, the transmission angle, the time ratio and the position, velocity and acceleration of every point over a cycle, plus the input torque.
In a four-bar linkage, if s + l ≤ p + q (shortest plus longest does not exceed the other two), at least one link can rotate fully.
With Grübler's equation: M = 3(n − 1) − 2j₁ − j₂.
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