CHAPTER 9: MALFUNCTIONS 9-11
ALPHA 552
2. FACTORS AFFECTING PERFORMANCE
2.1. Installation
The installation is a very important phase that, if neglected, could seriously impede the operation of the
barfeed system.
The distance between the barfeed system and the lathe influences greatly the
quality of the guiding. The further the barfeed 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 barfeed system is done in accordance
with the instructions indicated in Chapter 3: Setting into operation.
The guiding channel of the barfeed 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 barfeed 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.
2.2. 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.
2.3. Gap between the spindle and the bar
While the rear of the bar is maintained by front rest of the barfeed 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.
To Next Page
Loading...
