Linkage for 180 deg. oscillation 4a

Input: red crank of full rotation.
Output: pink crank performing 180 deg. oscillation.
This feature cannot be achieved using only a four-bar link.
It is developed from the Chebyshev Lambda Linkage (pink, green and blue links).
Red crank and yellow bar act like a slider-crank mechanism of a virtual runway (green line).
This video was made based on
https://youtu.be/BueUBcyq-po
Thanks to the video creator for providing the linkage dimensions.
- Part lengths:
Red: 2a
Green: 2.5a + 2.5a
Blue: 2.5a
Pink: a
Yellow: b, where b has any value.
- Base dimensions:
Horizontal distance from A to B = b
Vertical distance from A to B = 4a
Horizontal distance from B to C = 2a

STEP files of this video:
https://www.mediafire.com/file/4zummqg17sk76p3/Linkage180Oscillation4aSTEP.zip/file
Inventor files of this video:
https://www.mediafire.com/file/wmdt4smketqlhgf/Linkage180Oscillation4aInv.zip/file

Видео Linkage for 180 deg. oscillation 4a канала thang010146