wherein the linear rail slide block assembly component consists of a fixed rail A, a fixed rail B, a floating rail, a dust cover, a motor fixed plate, a bearing fixed plate, a slide block, a screw-nut with flange, a ball screw, a coupling, a bearing and a motor; the fixed rail A and fixed rail B are symmetrically arranged; after ultra-precision grinding, the working plane A of fixed rail, the working plane B of fixed rail, the assembly plane A of fixed rail and the assembly plane B of fixed rail have submicron plane accuracy; the fixed rail A and the fixed rail B are fixed on the adapter plate; the assembly plane A of fixed rail is closely assembled with the rail plane A of adapter plate, and the assembly plane B of fixed rail is closely assembled with the rail plane B of adapter plate; the slide block is located between two fixed rails, the working plane A of slide block is closely assembled with the working plane A of fixed rail, the working plane B of slide block is closely assembled with the working plane B of fixed rail, and the intersection line of the two working planes of fixed rails is parallel to the top plane of the slide block; the working plane C of slide block is closely assembled with the working plane A of floating rail, and the working plane D of slide block is closely assembled with the working plane B of floating rail; three through holes for installing probe are designed on the flank of the longer side of the slide block; after installing the probe, it can be used to measure the helix deviation of left-hand, right-hand involute helicoid or involute cylindrical surface; each through hole for installing probe corresponds to the top plane of the slide block, which is used to install the set screw with positioning ball; the inductor micro-displacement probe can be fixed by the structure of through holes and screw holes to prevent the inductor micro-displacement probe from swinging up and down; the screw-nut, flange and embedded oil nozzle are installed in the flank of the shorter side of the slide block, and one through hole for installing oil nozzle is processed on this flank; one oil hole is processed on the working plane A of slide block and the working plane B of slide block respectively, and the oil hole is connected with the through hole for installing oil nozzle; the oil can be evenly distributed between the working plane A of slide block, the working plane B of slide block and the PTFE rail soft belt to realize lubrication; the motor fixed plate is fixed at one end of the two fixed rails and the bearing fixed plate is fixed at the other end of the two fixed rails; the dust cover is fixed on the vertical plane A of fixed rail and the vertical plane B of fixed rail; the set screws with positioning ball are installed in the screw holes of dust cover; the floating rail is fixed on the top plane of slide block, and the posture of the floating rail is adjusted with the connection of set screws with positioning ball to control the press force applied by the floating rail to the slide block; the bearing is installed at the shaft end of the ball screw; the axis of the ball screw is parallel to the intersection of the working plane A of slide block and the working plane B of slide block; the motor drives the ball screw to rotate, then the slide block move in a straight line; during the movement of slide block from one end of two fixed rails to the other, use an altimeter to measure the height of the top plane of slide block; if there is a difference in the height value, grinding an area corresponding to the working plane A of fixed rail and the assembly plane A of fixed rail with a larger height value, so as to adjust the top plane of slide block to be at the same height;

the inductor micro-displacement probe consists of a ball probe, an inductance micrometer measurement rod, and a probe extension rod for connecting the two parts; the installation height of inductor micro-displacement probe is a fixed value, and the height value of the measuring point is the installation height of the working plane of generating rails; the measurement direction of inductor micro-displacement probe is the normal direction of the flank of the gear helix artifact When the slide block moves along the two fixed rails, the motion track of the inductor micro-displacement probe is a straight line, which is parallel to the intersection of the working plane A of fixed rail and the working plane B of fixed rail, the included angle with the axis of gear helix artifact is the base circle helix angle, and the motion track of the measuring point is the contact line of the flank of gear helix artifact;

the linear rail slide block assembly component is fixed on the dividing table with the adapter plate; after ultra-precision grinding, the rail plane A of adapter plate, the rail plane B of adapter plate and the assembly plane of adapter plate have submicron plane accuracy; the adapter plate is fixed on the dividing table, and the assembly plane of adapter plate is closely assembled with the dividing table; the dividing table can realize the high-precision indexing of the linear rail slide block assembly component according to the specific angle of any base circle spiral angle; the dividing table is used to drive the rotation of linear rail slide block assembly component, which can adjust the angle between the intersection line of the working plane A of fixed rail and the working plane B of fixed rail and the axis of the gear helix artifact, and realize the helix deviation measurement of the gear helix artifact with arbitrary base circle helix angle;

the helix artifact rolling component consist of the base-circle plates, a gear helix artifact and the multi-ball axle sleeves, the cross washers, the plain washers are respectively assembled on both shaft ends of the gear helix artifact; the gear helix artifact is installed between the inner holes of the two base-circle plates with a locking nut.