Screw liftThe screw nut drive is one of the most common mechanisms to achieve linear motion.It is difficult to achieve no gap between the lead screw and the nut.Especially after a stage of use, due to wear and tear, the gap will increase, affecting the normal operation of the equipment.Therefore, in the process of equipment maintenance, it is very necessary to pay attention to eliminating the gap between the lead screw and the nut.
Shift compensation is often used for single-term precision error compensation.
1.Screw liftCompensation for axial movement: First, measure the perpendicularity error of the bearing positioning end face on the main shaft and the center line of the main shaft and its direction position; then measure the end face circular runout error of the thrust bearing and its highest point position, and finally make the bearing positioning end face. The highest point is displaced so as to fit together with the lowest point of the circular runout of the thrust bearing end face, which can reduce the amount of error in the axial play.
2.Screw liftCompensation of radial runout: For parts assembled on the shaft, such as gears, worm gears, etc., the radial runout value of the part on the outer circle and the shaft at the assembly of the part should be measured first, and the highest point should be determined respectively. Location.During assembly, move and adjust the highest point of the radial runout of the two so that they are in a direction that differs by 180° to offset part of the radial runout error.When assembling the rolling bearing, the highest point of the radial circular runout of the journal and the lowest point of the radial circular runout of the inner diameter of the rolling bearing can be installed at the same position.In order to reduce the radial runout value at the front end of the main shaft of the lead screw elevator, the maximum radial runout points generated at the front and rear bearings can be located on the same side of the main shaft centerline in the same axial plane, and the error value of the front bearing can be set. Less than the error value of the rear bearing.