Dyads do not change the number of Degrees-of-Freedom of a kinematic-chain. If the kinematic-chain has Green Part-Outlines before you add the Dyad, it should have Green Part-Outlines after To show you how to add this Dyad, we have two design cases.
There are two Slide-Joints and one Pin-Joint in the PRP Dyad, and two Parts. I follow a consistent three-step procedure: General Three-Step Procedure to add a Dyad
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CASE 1: |
CASE 2: |
Examples |
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Preparation: Two Kinematically Defined Parts:
Note: Line |
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Step 1: New Parts Add two Parts. |
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Step 2: 'Outer' Joints Add the two 'outer' Joints (R-R Joints). In this case, a:
The two Joints are the two 'outer' Joints of the Dyad: P-P |
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Step 3: 'Inner' Joint Add the 'inner' Joint (-R-). In this case, join the two new parts together with a Slide-Joint The Kinematic-Chain becomes Kinematically Defined Note: The orientation of the Parts in a Dyad with a Slide-Joint are a function of the +X-axis direction of the Lines in each Part. |
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Kinematics-Tree Shows the original Rocker or Slider, plus the new PRP Dyad. |