
OPTIMUM
M A S C H I N E N - G E R M A N Y
Operation
Version 1.0.1 dated 2015-05-27
Page 41
Original operating instructions
TU3008 | TU3008V
GB
4.12.3 Speed information, maintenance recommendations, reference speed in accordance
with DIN 6386
The reference speed is the number of rotations, at which the mathematical centrifugal force
with the corresponding jaw design correlates with the greatest tensioning force when the
machine is at a standstill. The reference speed applies for jaws mounted inside in tiers,
whereby they must not protrude past the outer diameter of the chuck.
At the determined reference speed, 1/3 of the tensioning force which is available when the
machine is at a standstill, is available for clamping the workpiece. The prerequisite is that the
clamping chuck is in proper working order.
In general, the labels on the clamping jaws and lathe chuck (perm. speed, max. turning diame-
ter, ...), the information in the respective lathe chuck operating instructions and, for special
jaws, the additional information on the respective drawing must be observed.
The workpieces must be clamped firmly and securely onto the lathe before they are machined.
The clamping force should be strong enough to ensure that the workpiece is moved correctly,
but not so tight that it is damaged or deformed.
WARNING!
Do not clamp any work pieces that exceed the permitted chucking capacity of the lathe
chuck. The clamping force of the lathe chuck is too low if the clamping range is
exceeded. The clamping jaws may loosen.
4.12.4 Three-jaw lathe chuck Ø 160 mm
Hand-activated, centrically clamping three-jaw lathe chuck with spiral ring and clamping jaws
that are tiered both inside and outside.
Recommended rotational speed for clamping jaws graded internally, flush with the
external chuck diameter
on the lathe chuck,
or in the operating
instructions for the
lathe chuck
minimum clamping force of all jaws reached with a lathe chuck key when lathe
chuck is at a standstill
31 KN
GB
160 mm
maximum admissible clamping diameter d12
for clamping jaws assembled with internal grading
160 mm
maximum admissible clamping diameter d6
for clamping jaws assembled with external grading
68 mm
minimum clamping diameter d5
for clamping jaws assembled with external grading
3 mm