Table of contents
3QLCLM
Edition: 04/2014
31
Attention:
The length of the draw tube has to
be arranged so that
the setting dimension "E" is obtained in the
position shown.
Dimension "E" is the measured distance
between the contact surface of the power
chuck and the back edge of the register
diameter in the chuck piston (chuck piston
of the power chuck in the right hand
position).
Secure the draw tube
in the piston rod of the
actuating cylinder with
Loctite 242!
Chuck type
3QLCLM
-->
160
200
250
315
400
Setting dimension "E" + 0.2
mm
-->
6.1.4 Fitting and alignment of the draw tube
The high spindle speeds necessitate accurate balancing of the rotating parts. An imbalance in the chuck
body will cause free centrifugal forces when the spindle rotates; these centrifugal forces can cause
vibrations which have a negative effect on the product quality. Since the centrifugal forces per unit of
weight increase with the square of the spindle speed, the demands on the precision of balancing
increase with increasing speed of the parts.
For this reason, the lathe spindle, the actuating cylinder, the power chuck, the cylinder flange, the chuck
mounting flange or adapter plate and the draw tube must be balanced.
The power chuck is balanced dynamically, whereby any imbalance is corrected by screwing balancing
weights into the chuck body and the balance quality G = 2.5 to 4.3 (depending on chuck size) in
accordance with VDI 2060 (or DIN ISO 1940) is observed. Cylinder flanges or chuck mounting flanges
delivered by us and the draw tube are also balanced. The actuating cylinder is therefore balanced
dynamically in two planes, whereby any imbalance is corrected by screwing balancing weights into the
cover and the cylinder body of the actuating cylinder and the balance quality G =2.5 in accordance with
VDI 2060 (or DIN ISO 1940) is observed.
Right hand stop
Draw tube length L = A + B + C + D
– E – F
