The reasons why the axial clearance of main shaft cannot be adjusted and correct installation method of thrust ball bearing.

Two thrust ball bearings are installed at the tail of the lathe spindle, as shown in the figure. Due to the large axial load when machining parts, on the other hand, the lubrication conditions of thrust ball bearings 3 and 4 outside the spindle box are poor, so they are easy to be damaged. After replacing the thrust ball bearing, it is often found that the axial clearance of the main shaft cannot be adjusted to meet the technical requirements. As long as the main shaft rotates for a few minutes, it will be found that the front and rear of the main axle box smoke; If the clearance adjustment is larger, the parts cannot be processed; Therefore, there are repeated disassembly and assembly of the main shaft, and even misjudge the deformation of the main shaft.

1. Principal axis   2. Adjusting nut   3. Thrust ball bearing (loose ring)   4. Thrust ball bearing (tight ring)   5. Bearing cover   6. Bearing   7. Headbox   8. Spacer 9. Thrust ball bearing (tight ring)   10. Thrust ball bearing (loose ring)

Incorrect installation of thrust ball bearing of lathe spindle

1. Reasons why the axial clearance of main shaft cannot be adjusted

(1) When replacing the thrust ball bearing, people ignore the difference between the elastic ring of the thrust ball bearing (the inner hole of the loose ring is 0.2mm larger than the inner hole of the tight ring) and the role and installation position of the elastic ring.

(2) When installing the thrust ball bearing, do not check the installation position of the elastic ring, install it on the main shaft casually, install the tightening ring 9 on one side of the spacer 8 and the tightening ring 4 on one side of the bearing cover 5; When the nut 2 is adjusted, the spindle moves along the axial direction to make the axial movement clearance of the spindle meet the technical requirements. When machining parts, the tightening rings 4 and 9 rotate with the spindle. Under the action of axial cutting force, the tightening ring 9 is tightly pressed on the end face of the spacer 8, the two contact surfaces generate friction, the temperature rises sharply, the lubricating oil quickly loses its lubrication and heat dissipation, the surfaces at both ends wear quickly, and a large amount of oil smoke is generated in the spindle box from the front and back of the spindle.

2. Correct installation method of thrust ball bearing

It can be seen from the figure that the wrong installation of thrust ball bearing will seriously damage the accuracy of machine tool spindle and cause unnecessary waste of manpower. Therefore, when installing the axial thrust ball bearing, we only need to exchange the position of the loose ring 3 and the tight ring 4, and the loose ring 3 is close to the bearing cover 5; Exchange the position of the loose ring 10 and the tight ring 9 to make the loose ring 10 close to the spacer 8; Adjust nut 2 to change the axial clearance of the main shaft; The loose rings 4 and 9 will not rotate with the main shaft, and the end faces of bearing cover 5 and spacer 8 will not be worn.

More about ITS Thrust Ball Bearing:

ITS thrust ball bearing top quality brand has guaranteed production and highly active management. A ball thrust bearing is a particular type of rotary ball bearing. Like other ball bearings, they permit rotation between parts, but they are designed to support a high axial load while doing this (parallel to the shaft). Higher speed applications require oil lubrication.

ITS main products are ball bearings, roller bearings, mounted units, linear bearings, stamping bearings, plastic roller bearings and automotive hub units, which are widely used in automotive aftermarket, mining & construction, agriculture, machine tool, household equipment, etc. ITS bearings enjoy good reputation for their steady and reliable performance through these complicated and tough application fields.

The ITS team has been engaged in Manufacturing bearings and international trade for more than 20 years. We always focus on the top quality bearing markets all over the world. The guaranteed production and highly active management has brought us competitive advantage in price and service. ITS Customer Service team has the expertise in bearing manufacturing and is available round the clock. We promise that ITS only provides top quality products with the best price and the most professional service! We sincerely invite all of you to cooperate with us.