LNS QUICK SIX S2, Инструкция по эксплуатации

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CHAPTER 4: OPERATION 39
MOVE S2
There are different kinds of collets that are more or less effective:
a) Simple cone collet
The bar is held over about 350°, over a length
from 0.5 to 7 times the diameter.
Efficiency : good to very good
b) Bi-conical collet
Clamping over 1 or 2 x 350°, over an approximate
length of 1.2 times the diameter.
Efficiency : very good to excellent
c) Double cone collet
The double cone clamp has the great advantage
of holding the bar at two points separated by
about 1.5 the diameter, with a clamping 2 times
350° over about 0.5 times the diameter.
Efficiency : excellent
With this type of clamping, one should be very careful given that in many cases the bar is held only at
three points, thereby greatly increasing the risk of vibration.
Frequent errors and possibilities for improving the effectiveness of the clamping grip.
a) Hard grips
Wrong : The radius of the grip is greater than
the radius of the bar.
The jaws press against only 3 points at
120°.
Correct : Modify the centers of the jaws to obtain
2 times 6 support clamping points at
60°.