Methods of depositing hardfacing material portions of earth-boring tools may involve supporting at least a portion of an earth-boring tool in a holder of a workpiece positioner, the holder being movable in at least a third plane. A location of a surface of the at least a portion of the earth-boring tool may be determined utilizing at least one sensor. The workpiece positioner, the sensor, and a torch positioner comprising a hardfacing torch movable in at least a first plane perpendicular to the third plane and a second plane parallel to the third plane may be controlled utilizing a programmable control system to cause the torch positioner to oscillate the hardfacing torch in the second plane while selectively causing the workpiece positioner to move the holder in the third plane and causing the torch to deposit hardfacing material on the surface.