Operation
Version 1.0.1 dated 2017-11-16
Page 38
Translation of the original instructions
TX6222
GB
T
X
6222
_GB
_4.
fm
OPTIMUM
M A S C H I N E N - G E R M A N Y
®
Spare chucks must be designed for the maximum rotational speed of the machine, the permis-
siblechuck speed must be marked on the chuck. The minimum distance to the machine bed
must not be less than 25 mm.
WARNING!
Do not clamp any workpieces that exceed the permitted chucking capacity of the lathe
chuck. The clamping force of the chuck is too low if its capacity is being exceeded. The
clamping jaws may loosen.
Only use lathe chucks designed for the speed of the machine.
Do not use lathe chucks with an external diameter that is too large.
CAUTION!
When clamping workpieces or assembling heavy weight lathe chucks and rests,
reasonable stress loads on the operator or assembler may be exceeded.
4.11.1 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.
4.11.2 Influencing factors that significantly impact the tensioning force
Clamping jaw centrifugal force
To calculate the required tensioning force for processing a workpiece, the centrifugal force of
the clamping jaws must be taken into account.
Recommended threshold values when lifting and carrying loads
Reasonable load in kg and frequency of lifting and carrying
Occasionally
More frequently
Age in years
Women
Men
Women
Men
15 - 18
15
35
10
20
19 - 45
15
55
10
30
above 45
15
45
10
25
Formula:
Fc
Centrifugal force in N
m
Mass in kg/set
rs
Centre of gravity distance to the centre of the chuck in
metres
n
Speed min
-1
r
0
Centre of gravity distance to the clamping jaw
