Lead screw lifting machines utilize a screw-nut transmission mechanism for achieving linear motion, which is a common setup. It is challenging to achieve a perfect fit between the screw and nut without any clearance. Particularly after a period of use, wear can exacerbate the gap, affecting the normal operation of the equipment. Therefore, it is very necessary to pay attention to eliminating the clearance between the screw and nut during the equipment maintenance process.

Displacement compensation is commonly used for error compensation in single-axis precision.

Compensation for the axial movement of the screw lifting jack: Firstly, measure the perpendicularity error and direction position of the bearing locating face on the main shaft and the center line of the main shaft; then measure the face circular跳动 error of the thrust bearing and its high point position, and shift the high point of the bearing locating face so that it can be assembled with the low point of the thrust bearing face circular跳动, thereby reducing the axial movement error.

2. Compensation for radial circular跳动 in screw jack: For components mounted on the shaft, such as gears, worm gears, etc., measure the radial circular跳动 values at the outer circumference of the components and the shaft at the component mounting location. Determine the positions of the high points separately. During assembly, adjust the high points of both to be 180° apart, to partially offset the radial circular跳动 errors. When assembling roller bearings, align the high points of the shaft neck with the low points of the radial circular跳动 of the bearing inner hole at the same position. To reduce the radial circular跳动 at the front end of the screw jack main shaft, position the large radial circular跳动 points on both front and rear bearing locations on the same axial plane side of the main shaft centerline, ensuring the front bearing error is less than the rear bearing error.