CHAPTER 9: TROUBLESHOOTING 9-23
ALPHA ST320 S2
3. FACTORS AFFECTING PERFORMANCE
3.1. Installation
The installation is a very important phase that, if neglected, could seriously impede the operation of the
bar feed system.
The distance between the bar feed system and the lathe influences greatly
the quality of the guiding. The further the bar feed system is from the spindle -
and therefore, away from the clamping system - the larger the non-guided
part of the bar will be.
It is essential that the mounting of the bar feed system is done in accordance
with the instructions indicated in Chapter 3: Setting into operation.
The guiding channel of the bar feed system serves, by definition, to guide the
bar outside the lathe. Although the bar rotates in an oil bath inside the
guiding channel, the alignment of the channel with the axis of the spindle
must be perfect.
It is essential that the alignment of the bar feed system is done in accordance
with the instructions indicated in Chapter 3: Setting into operation.
In some cases, the length of the spindle may influence the quality of the
guidance.
3.2. Gap between the guiding elements and the bar
The best results are obtained when the bar is guided with precision (2 mm). The greater the reduction of
the clearance between the bar and the tube, the greater the rotation speeds will be.
When the clearance between the bar and the tube becomes too great, a rupture of the oil film occurs
which results in the reduction of the rotation speeds permitted.
3.3. Gap between the spindle and the bar
W
hile the rear of the bar is maintained by front rest of the bar feed system and the front by the collet or
the chuck of the lathe, it is possible for the portion of the bar inside the spindle to oscillate, if the
clearance is too great.
It is, therefore, highly recommended to install reduction liner inside the spindle. Please contact your LNS
SA dealer for further information.
To Next Page
Loading...
