It starts from a planetary mechanism that generates hypocycloids and it is completed with an RPP dyad, so that transfer functions are generated, i.e. races along the x and y directions. Different hypocycloids (normal, elongated, shortened) are generated and transfer functions are established for these cases. The obtained curves and transfer functions are discussed, establishing some conclusions. All study includes various range of lengths for the cinematic links so the important and interesting trajectories are found. The related transfer functions can be used in a diversity of applications. These findings are useful for special devices for automatic lathes, horizontal forging machines, textile machinery, and kinetic art.

In the paper we study the construction and functioning of a saw mill, empirically built in 1930th by a craftsman peasant in Sibiu area. The saw mill has a gear mechanism which allows actuation with animal traction, a rod-crank mechanism that ensures the cutting motion and a mechanism for self - advance of the wood to be cut. Kinematic analysis it is made, proving the ingenuity of the craftsman who has achieved a functional saw mill, whose advance motion is well correlated with the cutting motion. Different kinematic schemes and numerous charts are given, emphasizing the creativity of the craftsman, who empirically found the correct sizes for the mechanism’s elements