A guide module for making a movement plane, comprising: - a rotation unit rotatable about a longitudinal axis (Z); - a ball mounted on the rotation unit by means of a respective actuation pin in a rotatable fashion relative to the rotation unit about a transversal axis (X), perpendicular to the longitudinal axis (Z), the transversal axis (X) being fixed relative to the rotation unit , wherein the rotation unit has a tubular shape, extending around the longitudinal axis (Z) and defining an inner space (V) in which are at least partly housed the ball and the respective actuation pin ; - a first actuator acting on the rotation unit to move the rotation unit in an adjustable fashion about the longitudinal axis (Z); - a second actuator acting on the actuation pin of the ball for moving the ball about the transversal axis (X); and - a transmission unit rotatable about the longitudinal axis (Z) and having, at a relative first end, a first ring gear meshing with a transmission pinion rotationally integral with the actuation pin , the second actuator acting on the transmission unit for rotating the first ring gear about the longitudinal axis (Z), the transmission unit also comprising at or close to a relative second end opposite the first, a second ring gear meshing with an actuation pinion on which the second actuator acts; characterized in that the second ring gear is defined by a row of radial teeth facing towards the longitudinal axis (Z); wherein the rotation unit has, in a relative portion opposite or distal from the actuation pin of the ball , a respective row of guide teeth meshing with a shaft of the first actuator and defined by radial teeth facing towards the longitudinal axis (Z); and wherein the first and second actuators are mounted in side-byside configuration and aligned along the longitudinal axis (Z), each of the first and second actuators comprising a respective actuation pinion rotatable about a parallel axis and offset relative to the longitudinal axis (Z). - a rotation unit rotatable about a longitudinal axis (Z); - a ball mounted on the rotation unit by means of a respective actuation pin in a rotatable fashion relative to the rotation unit about a transversal axis (X), perpendicular to the longitudinal axis (Z), the transversal axis (X) being fixed relative to the rotation unit , wherein the rotation unit has a tubular shape, extending around the longitudinal axis (Z) and defining an inner space (V) in which are at least partly housed the ball and the respective actuation pin ; - a first actuator acting on the rotation unit to move the rotation unit in an adjustable fashion about the longitudinal axis (Z); - a second actuator acting on the actuation pin of the ball for moving the ball about the transversal axis (X); and - a transmission unit rotatable about the longitudinal axis (Z) and having, at a relative first end, a first ring gear meshing with a transmission pinion rotationally integral with the actuation pin , the second actuator acting on the transmission unit for rotating the first ring gear about the longitudinal axis (Z), the transmission unit also comprising at or close to a relative second end opposite the first, a second ring gear meshing with an actuation pinion on which the second actuator acts; characterized in that the second ring gear is defined by a row of radial teeth facing towards the longitudinal axis (Z); wherein the rotation unit has, in a relative portion opposite or distal from the actuation pin of the ball , a respective row of guide teeth meshing with a shaft of the first actuator and defined by radial teeth facing towards the longitudinal axis (Z); and wherein the first and second actuators are mounted in side-byside configuration and aligned along the longitudinal axis (Z), each of the first and second actuators comprising a respective actuation pinion rotatable about a parallel axis and offset relative to the longitudinal axis (Z). <EOS>