Geometry of Gaudi-inspired screw for differential drive mechanism

A novel differential screw drive mechanisms for 2-dof (one-rotational and one-translational) drive system is proposed in this paper. The proposed screw is named as Gaudi-inspired screw, because the shape of the screw is similar to the double helix columns by Antoni Gaudi. Kinematics, geometry, and prototyping the Gaudi-inspired screw is introduced in this paper. Firstly, kinematics about differential screw drive mechanism, including the Gaudi-inspired screw, is introduced. The Gaudi-inspired screw is overlapped helix of the right and left helix of a square. Geometrical characteristics and shapes of the cross sections of the screw are discussed in detail. Plans for making the screw and the nuts by 3D printing, cutting, form grinding, wire-cut EDM and die-sink EDM are introduced. The Gaudi-inspired screw and the nuts were prototyped by 3D printing and by cutting.