CHAPTER 9: TROUBLESHOOTING / MAINTENANCE 93
TRYTON 107/112
b) Soft grips
Wrong: The radius of the jaws is greater than
the radius of the bar. The jaws press against only
three points at 120 degrees.
Correct: Modify the centers of the jaws to obtain
2 times 6 support clamping points at 60 degrees.
1.12. Liaison bar feeder - lathe
1.12.1. Spindle reduction tubes
The efficiency of the bar guiding while in rotation in the lathe is determined by the clearance between the
spindle reduction tube and the rotating bar. The greater the clearance is, the more frequent the vibrations
are.
Using reduction tubes helps to decrease this clearance. Guiding is thus improved, but, in addition, the
insertion of the bar into the clamping device of the lathe is made much easier.
The inside diameter of the reduction tubes should be chosen in terms of the diameter of the bar (diameter
of the bar + 1 mm), but should always be larger than that of the diameter of the feeding pusher.
Spindle reduction tubes are available from LNS, upon request.
1.13. Shaped bars (hex and square)
To load shaped bars, the feeder must be fitted with the appropriate gripping jaws.
It is possible to install a bushing, inside the clamping device, with the same inside profile (+ 0.2 mm) as the
bar.
The rear of this collet and the front of the bars should be flat.
During the loading cycle, a slight rotation of the spindle (about 30 RPM) is desirable.
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