GeoGebra | Linkage for Drawing an Approximate Square
25Earlier 2D draft. • GeoGebra | Linkage for Drawing an App...
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^^^ If the link is expired, check the latest video and try that one.
Cyan bar is the input. Red pen is the output, and can be placed either above or below the pantograph without obstruction.
Bars of the same color are equal in length. The orange and yellow bars are equal in length.
Dimensions:
Length of cyan bar = 1.125 * sqrt(2)
Length of purple L bar = 6 + 6
Length of dark blue bars = 2
Length of light blue bars = 4
Length of yellow and orange bar = sqrt(5)
Length of green bars = 2 + 1.5 * sqrt(2) [End that is 2 long is connected to the yellow and orange links; end that is 1.5 * sqrt(2) long is connected to the brown bars]
Length of brown bars = 2
Length of bright pink bars = 3
Length of light pink bars = 1.5
Sidenotes:
In the original animation, I used a length of 5.5 + 5.5 for the purple bars, however they go through the red sliders. Adding 1 unit longer should hopefully fix that issue.
In the original animation, I used a length of sqrt(2) for the cyan bar, however using 1.125 * sqrt(2) is actually a much better approximation for a square.