A Scotch-Yoke is a mechanism that changes rotary motion at its input to linear motion at its output. The input rotates with constant angular speed. The output reciprocates with Simple Harmonic Motion. The kinematic-chain is:
(Closure - Review the Change Dyad Closure tool - you may need to use it when the Dyad builds the first time!).
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The video shows a Scotch-Yoke.
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We must add 2 Parts and 3 Joints (Top Tip: Add the 'Output' Part and Joint first). DYAD: Part The output of the Scotch-Yoke is a Sliding-Part
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DYAD: Part
The two Parts are Blue Parts |
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Dyad: Joint 3 between Part 1 & Part 2 This joint is a vertical slide-joint (the slot) between the two new Parts Preparation for Joint 3 – draw a vertical line to give the direction of the 'slot'
This image shows the Vertical Line in the Part-Editor. |
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Add Joint 3: the Slide-Joint This image shows the vertical Line
MechDesigner completes the Dyad to Add the Slide-Joint The Part-Outlines become green to indicate the kinematic-chain is kinematically-defined. Note: The Part If you prefer the Part to be in the other direction: Add the Line Cycle the mechanism (ALT+C on your keyboard). |
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This is the kinematics of a 'Scotch-Yoke'. It has a:
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