1. Assembly of Rolling bearings

(1) No contamination in the bearing position before the bearing is assembled.

(2) When assembling the bearing, a layer of lubricating oil should be applied to the surface of the mating part, and the end of the bearing without a model number should face inward, that is, against the shaft shoulder.

(3) Special pressing tools should be used when assembling the bearings. Direct hitting methods are strictly prohibited. The magnitude, direction and position of the force applied when the bearing is assembled should be appropriate. The protective frame or rolling elements should not be stressed. Force to ensure that the end face is perpendicular to the shaft.

(4) The end face of the inner ring of the bearing should generally be close to the shaft shoulder (shaft clamp). After the outer ring of the bearing is assembled, the contact between the bearing cap of the positioning end and the gasket or outer ring should be even.

(5) After the rolling bearing is installed, the rotation of the relative moving parts should be flexible and light. If there is jamming, the cause of the problem should be checked and analyzed and the corresponding treatment should be made.

(6) In the process of bearing assembly, if the hole or shaft fit is found to be too loose, the tolerance should be checked; when the bearing is too tight, the rough assembly should not be forced, and the cause of the problem should be checked and analyzed and dealt with accordingly.

(7) The axial clearance of single-row tapered roller bearings, angular contact thrust bearings, and two-way thrust ball bearings is in accordance with the drawings and process requirements during assembly.

(8) For bearings using grease and their mating surfaces, proper amount of grease should be injected after assembly. For bearings whose working temperature does not exceed 65℃, ZG-5 grease can be adopted according to GB491-65 "Calcium-based Grease"; for bearings whose working temperature is higher than 65℃, it can be adopted according to GB492-77 "Calcium-based Grease" ZN-2ZN-3 grease.

(9) The temperature rise of ordinary bearings during normal operation should not exceed 35℃, and the maximum temperature during operation should not exceed 70℃.

2. Assembly of Linear Bearing 

(1) Before assembly, grease should be applied inside the bearing.

(2) When the bearing is pressed into the support seat, a special installation tool should be used to press against the end face of the outer ring, and it is not allowed to directly hit the bearing to avoid deformation.

(3) The fit of the bearing and the supporting seat must meet the tolerance requirements. Too tight will cause interference fit between the guide shaft and the bearing, which will damage the bearing; too loose will make the bearing unable to be fixed in the supporting seat.

(4) When the guide shaft is installed into the bearing, it should be inserted gently in the center. If it is inserted slantingly, the ball will fall off and the cage will deform.

(5) When the bearing is installed in the supporting seat, it is not allowed to rotate. Forcibly rotating it will damage the bearing.

(6) It is not allowed to use a set screw to directly tighten the outer ring of the bearing, otherwise it will be deformed

3. Assembly of Linear guide

(1) The installation part of the guide rail must be free of dirt, and the flatness of the installation surface must meet the requirements.

(2) When there is a reference edge on the side of the guide rail, it should be installed close to the reference side. If there is no reference side, ensure that the sliding direction of the guide rail is consistent with the design requirements. After the guide rail fixing screws are tightened, check whether the sliding direction of the slider is deviated. Otherwise it must be adjusted.

(3) If the sliding block is driven by a transmission belt, after the transmission belt and the sliding block are fixed and tensioned, the transmission belt must not be inclined, otherwise the pulley must be adjusted to make the driving direction of the transmission belt parallel to the guide rail.