CHAPTER 9 : MALFUNCTIONS 9 - 3
TRYTON 112 CNC
1.4 Material
1.4.1 Bars
To obtain a perfect insertion inside the collet of the bar feed system, the bars must be
chamfered concentrically (at the rear) at 30o. 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.
1.4.2 Tubes
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.
1.4.3 Profiled material
Loading shaped bars requires the installation of adapted components which are available on
demand. Please ask your local LNS representative for advice.
1.4.4 Straightness of the bars
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.
1.4.5 Composition of the material
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 of aluminum are very easy to guide.
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