six-bar
Watt's chain
Six links and 7 pin joints, so Grübler counts 3(6 − 1) − 2(7) = 1 and the rank of the Jacobian measures 1. Two of the six links must carry three joints; they are shaded. Here they share a joint, which makes this a Watt chain. That adjacency is the entire classification, and it is read off the graph rather than off the picture.
Where it is used
- The solver was refusing a quarter of the sweep Drawn wrongly
- Six bars, and what the extra dyad buys Linkages
- A dwell made from a curve Linkages
- What has to be solved together The chain before the lengths
- Seven lengths and a hundred corners As built
- The flattest dwell is not the longest The paths points trace
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