As one of the core components of each transfer machine, the spindle must be in more stringent conditions such as high humidity, dust, and large temperature difference in order to meet the requirements of high-precision machining, and continue to maintain a stable working state.

The main shaft of the transfer machine manufacturer is a hollow step shaft. The inner hole is made of long rod material. When the top is removed, it goes through the steel bar. It can also be used for pneumatic, electric and hydraulic clamping devices. The taper hole of the front shaft of the spindle is 90mm for mounting the upper sleeve and the front top. Sometimes it is also possible to install a mandrel, using the friction with the cone to directly drive the mandrel to achieve the rotation of the workpiece, and the position of the spindle taper hole is the processing hole.

For the clearance adjustment operation between the spindles of CNC lathes, we can roughly follow the following steps:

(1) Loosen the locking screw on the front nut.

② Tighten the adjusting nut, because the inner ring of the bearing is very thin, the inner hole is the same as the spindle cone, and the taper is 112°, so the inner ring moves to the right side of the spindle cone. Therefore, when the inner ring is moved axially, it creates radial elastic expansion, regulates the radial clearance or preload of the bearing, and locks the screw on the nut after the adjustment is complete.

The radial runout of the transfer machine directly affects the roundness and concentricity of the machined surface, while the axial runout affects the flatness and pitch accuracy of the machined end face. When the runout of the main shaft exceeds the allowable value, the runout of the main shaft can reach the allowable value only by properly adjusting the clearance between the front supports. If the radial runout still does not meet the requirements, the rear bearing should be adjusted.

The spindle of the CNC lathe is lubricated by the front and rear supports, and the lubricating oil is supplied by the lubricating oil pump. The lubricating oil is fully lubricated through the oil inlet hole of the bearing, and takes away the heat generated by the bearing during operation. In order to avoid oil accumulation, groove sealing is adopted at the front and rear support positions. Annular groove is provided on the outer surface of the front nut and the back support sleeve, and the groove has a zigzag cross section. In the CNC lathe spindle rotation, due to the role of centrifugal force, the oil will be thrown along the inclined plane (towards the direction of the box) into the oil tank on the flange, the oil flows through the return hole to the bottom of the box, and then flows back to the left leg of the bed in the oil pool.

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