CHAPTER 9: MALFUNCTIONS 9-14
ALPHA 538/552
2. FACTORS AFFECTING PERFORMANCE
2.1. Installation
The installation is a very important phase that, if neglected, could seriously impede the operation of the
bar feeder.
Distance The distance between the bar feeder and the lathe influences greatly the
quality of the guiding. The further the bar feeder 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 feeder is done in accordance with
the instructions indicated in Chapter 3: Setting into operation.
Alignment The guiding channel of the bar feeder 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 feeder 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
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 bar feeder 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...
