10 CHAPTER 1: BASIC NOTIONS
MOVE S2
To obtain a perfect insertion inside the collet of the bar feeder, the bars must be chamfered concentrically
(at the rear) at 30°. At the feeding process, it is recommended to deburr the bar at the front, to avoid
possible catching during the introduction of the bar inside the spindle.
To prevent mixing the oil from the feeding process and the cutting oil from the lathe, it is recommended to
put a plug in the rear of the tubes to be machined (see the start up manual).
Round and hex bars are relatively easy to guide. Square bars or those with special profiles increase the
risk of breaking the oil film.
Performances may vary, depending on the material machined, the length of the bar, etc. To obtain
optimum output, the bars must be straight.
If the torsion of the bars exceeds 0.5 mm/m, performance will automatically be reduced in regards to
speeds of rotation while vibrations will increase accordingly. In this instance, the quality of the guidance is
not the cause.
In general, the difficulty increases with the specific weight of the bar. Steel bars are relatively easy to
guide.
Because of their great flexibility and specific weight, brass bars are relatively difficult to guide at high
speeds. Aluminum bars are very easy to guide.
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