Static mechanical compliance
Material elasticities and their effect on workpiece accuracy: Understand them correctly and
know how to respond in real-world practice
NEW
Overview
Background
TF
EA
+M
Every material has a certain elasticity.
Depending on the orientation and
load, these affect the accuracy of machining in different ways. The figures
and data shown here provide information on the values to be expected.
T1
Optimization options
MOT / KAB
WMS / CNC
T2
/ T3
If the static stiffness is insufficient, the
following may help:
+ Error compensation in the axis
direction affected
+ Use of lighter clamping means
+ Retrofitting a counter bearing in
the case of a TF rotary table
+ Changing the machining strategy
0° position
90° position
RFX/LFX
Static mechanical analysis
General
accessories
Workpiece
clamping
Using FEM analyses, the compliance
in P8 (see figure at right) was calculated in the respective configuration for
all T-type rotary tables listed below.
The deflections in the X- and Y-directions are negligible. The table below
shows the deflection in the Z-direction.
Depending on the workpiece weight,
this information can be used to determine the approximate compliance.
Compliance for load in P8 in Z-direction (approximate values)
Condition: Rotary table is mounted in the specified manner and both axes are clamped with 6 bar compressed air.
Technology /
engineering
µm/kg
T1-507510
T1-510520
T1-520520
TF-507510
TF-510510
TF-510520
82
fix
–0.030
–0.021
–0.024
–0.093
–0.099
–0.050
0°
90°
fixX
fixX1
vario
varioX varioX1 varioX2 varioXA
fix
fixX
fixX1
vario
varioX varioX1 varioX2 varioXA
–0.029
–0.035 –0.052 –0.070
–0.100 –0.140
–0.080 –0.120 –0.180
–0.034
–0.026 –0.041 –0.054
–0.061 –0.098
–0.057