SUA 125 NUMERIC
34200003 TOS a.s. 02/2011
49
is located on the left hand side end of bed. It is very important for turning because the rotary motion is transmitted by
means of its front end with spindle flange to the workpiece.
The forces arrising from workpiece mass and turning (machining process, cutting process) are taken up in it.
Spindle bearing is formed with bearings in headstock.
The forces applied to work spindle are transmitted on the headstock body:
- in radial direction by means of double-row roller bearings of the NNK range in precision design of P 51.
- in axial direction by double raw angular contact bearings 23 4436 B in accuracy SP (UP).
The spindle bearing is adjusted by the manufacturer. When maintenance of the lathe is carried out in accordance with
this Manual there is no need to adjust the spindle bearing for several years. As far as a running clearance in spindle bearing
and undesirable spindle vibrations are occurred it is necessary to adjust it again. The re-adjusting of the spindle bearing
should be made according to the chapter „Service“. The setting method of the bearing is mentioned in this Manual.
Service for adjusting of work spindle bearing of lathe
If the running clearance in radial bearings of the work spindle is occured and lathe vibrations in turning increase, the bearing
prestressing of work spindle must be done.
If the ball races of the front radial bearing are worn-out and exceeds 0,01 mm, there is no use taking up the clearance of the
inner race on the work spindle taper. The required accuraccy of this bearing is unwarranted and it must be replaced.
Procedure for measuring of radial clearance in front and rear work spindle bearing and fixing the change of
dimensions of distance rings in accordance with the SKF Directive.
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