Sarrus Linear Axis Mark II

thingiverse

This second prototype features a Sarrus linkage type linear axis, utilizing hinged joints for linear motion. The objective is to develop a linear bearing for an x-y cartesian assembly without relying on long metal rods, resulting in a 3D printer that can produce more of its own components. Notably, the top armature has four holes aligning with patterns on end pieces, enabling one axis to mount onto two others at right angles. The drive system consists of a DC motor from an inkjet printer and a timing belt sourced from the same device. A skate bearing is employed within a flexure plate style mount to tension the belt, while an optical quadrature encoder provides feedback. Hinges are crafted with 1/16" brass rods as hinge pins, and reamed holes for pin insertion. Frank Davies shares a stl file (all_parts.stl) illustrating the completed assembly, along with individual stl files within a .zip for printing purposes. The estimated printing time is approximately 30 hours, requiring pieces such as pulley plates, belt plates, motor plates, end pieces, armatures, spines, hinge plates type A, and hinge plates type B.