LNS GT 326-E, Инструкция по эксплуатации, Страница: 146 / 218

9 TROUBLESHOOTING GUIDE
9 - 31
GT 326-E
9.5 FACTORS AFFECTING PERFORMANCE
9.5.1 Installation
The installation is a very important phase that, if neglected, could seriously impede the operation
of the bar feed system.
Distance 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.
Alignment 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.
Spindle length In some cases, the length of the spindle may influence the quality of the
guidance.
9.5.2 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.
9.5.3 Gap between the spindle and the bar
While 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 as indicated in the
start-up manual.