Controlling the polar coordinates of an object 3

OA = OB
The geometry of the mechanism ensures that it is always ON = OM.
The point M of the red object (slider) is determined by the distance r from the fixed point O (OM) and the angle φ from the fixed direction OA (angle AOM).
The yellow motor controls the angle φ by rotating the yellow bar.
The pink motor controls the distance r through a nut screw drive.
Two short jade bars are required to prevent instability of the mechanism when the beige bars are perpendicular to the OA or the yellow bar.
The red line is the trajectory of point M.
For this mechanism:
Pros: both motors are grounded. The change of one coordinate does not affect the other.
Cons: too many parts and limited range of r and φ.
This video is made based on an invention of Mr. Arglin Kampling:
https://youtu.be/aCbaNZJBqrA

Inventor files of this video:
https://www.mediafire.com/file/js2rr13v1q5z44w/ControllingPolarCoordinates3Inv.zip/file

Видео Controlling the polar coordinates of an object 3 канала thang010146