LNS QUICK LOAD SERVO III MI - Page 85

CHAPTER 7: OPERATION 7-9
QUICK LOAD SERVO III MI
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 centres of the jaws to obtain 2 times 6
support clamping points at 60 degrees.
3.3. Lathe – barfeed adaptation
3.3.1. Spindle reduction tubes
The efficiency of the bar guiding while in rotation in the lathe is determined by the clearance between the
spindle bore 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 (Ø of the
bar + 1 mm), but should always be larger than that of the diameter of the feeding pusher.
For inserting and removing the spindle reductions, move the bar feed system using the retraction device
(see CHAPTER 6, section 7. RETRACTION for further information).
Spindle reduction tubes are available from LNS, upon request.
60°
1/3 1/3 1/3
120°