Kinematics polar coordinates kinetics plotter

 Particle Kinetics: Normal-Tangential, Polar, Cylindrical Coordinates; Solving Accelerating 3D System

Kinematics  polar coordinates kinetics  plotter 

https://en.wikipedia.org/wiki/Geometry

Plane Curvilinear Motion - Polar Coordinates

http://www.conceptualdynamics.com/files/krb/krb_gen_ep2.htm

Using a Development Platform with an STM32 Processor to Prototype an Inexpensive 4-DoF Delta Parallel Robot