Controlling the polar coordinates of an object 2

Point A of the pink object (a slider) is determined by the distance r from a fixed point O and the angle φ from a fixed direction Ox.
The orange motor controls the distance r.
The violet motor controls the angle φ.
Blue line in the last scene of the video is the trajectory of point A.
Pros: both motors are grounded. The change of one coordinate does not affect the other.
Cons: too many parts and the height of the whole mechanism is large.

STEP files of this video:
https://www.mediafire.com/file/7rjun3nnkfug9lt/ControlPolarCoordinates2STEP.zip/file
Inventor files of this video:
https://www.mediafire.com/file/cpinu7xqblxsx5t/ControlPolarCoordinates2Inv.zip/file

Видео Controlling the polar coordinates of an object 2 канала thang010146