A worm drive having a worm and a worm wheel , including: a plurality of meshing assemblies (9a,...,9n) formed about the worm wheel , each meshing assembly (9a,...,9n) comprising a ball (13a,...,13n) and a cup (11a,...,11n), wherein each cup (11a,..., 11n) comprises a socket for receiving a portion of the ball (13a,...,13n), wherein each ball (13a,..., 13n) has a surface area portion that faces outwardly from its respective cup (11a,..., 11n) so as to present a spherical face to the worm , wherein each cup (11a,..., 11n) is orientated and aligned toward the worm , wherein each cup (11a,..., 11n) is orientated and aligned at an acute angle (θ 3 ) relative to a circumference of said worm wheel , wherein the acute angle (θ 3 ) allows a superior line of force to be transmitted from the worm to the worm wheel , wherein a cup centre line of each cup (11a,...,11n) is inclined towards a track of the worm to maximize thrust force off the worm in one rotational direction; wherein the worm comprises first and second threads that define the track there between and that proceed from a shank end to a tip end , the first and second threads presenting a concavely tapering side profile from the shank end to the tip end , wherein the concavely tapering side profile of the worm complements the meshing assemblies (9a,...,9n) of a peripheral portion of the worm wheel ; and wherein the pitch angles of the first thread and the second thread decrease from the tip end to the shank end and the diameters of the first thread and the second thread increase from the tip end to the shank end , whereby portions of the spherical faces of the balls (13a, ... ,13n) mesh with the concave track that run between the first and second threads and are free to rotate thereby reducing shear forces between the worm and the worm wheel in use. a plurality of meshing assemblies (9a,...,9n) formed about the worm wheel , each meshing assembly (9a,...,9n) comprising a ball (13a,...,13n) and a cup (11a,...,11n), wherein each cup (11a,..., 11n) comprises a socket for receiving a portion of the ball (13a,...,13n), wherein each ball (13a,..., 13n) has a surface area portion that faces outwardly from its respective cup (11a,..., 11n) so as to present a spherical face to the worm , wherein each cup (11a,..., 11n) is orientated and aligned toward the worm , wherein each cup (11a,..., 11n) is orientated and aligned at an acute angle (θ 3 ) relative to a circumference of said worm wheel , wherein the acute angle (θ 3 ) allows a superior line of force to be transmitted from the worm to the worm wheel , wherein a cup centre line of each cup (11a,...,11n) is inclined towards a track of the worm to maximize thrust force off the worm in one rotational direction; wherein the worm comprises first and second threads that define the track there between and that proceed from a shank end to a tip end , the first and second threads presenting a concavely tapering side profile from the shank end to the tip end , wherein the concavely tapering side profile of the worm complements the meshing assemblies (9a,...,9n) of a peripheral portion of the worm wheel ; and wherein the pitch angles of the first thread and the second thread decrease from the tip end to the shank end and the diameters of the first thread and the second thread increase from the tip end to the shank end , whereby portions of the spherical faces of the balls (13a, ... ,13n) mesh with the concave track that run between the first and second threads and are free to rotate thereby reducing shear forces between the worm and the worm wheel in use. <EOS>