Flexibility and precision – previously hard-to-combine attributes in centering and edge processing of large optics – have become reality with the SCHNEIDER SLC 302 centering machine.
Resting on a very stiff cast iron base, two independently controlled processing slides enable a wide range of useful processing combinations. Rough and fine grinding, serial or simultaneous processing of simple or sophisticated contours and recesses – you name it, the SLC 302 will do it in a single run.
The fully automated clamping of the lenses is quickly accomplished by using the unique CNC controlled differential clamping technology. And, freely defined lens contours are easily accomplished by using the SCHNEIDER Centering Technology software SCT.
The SLC 302 builds on a solid design: The high-precision centering spindles together with the very accurate guiding system and the sophisticated clamping technology rest on a cast-iron housing.
The industrial PC controller system in conjunction with the quality-defining AC servo drives enable high precision and excellent dynamics for the centering process. Using a comprehensive technology library, the geometry and technology software brings flexibility to the operation.
A CNC-controlled clamping technique guarantees a sensitive, fully automatic clamping of the lens with minimal setup times by using differential measuring technique.
SCHNEIDER’s proprietary wear-free precision clamping chucks come with an optimized geometry and surface structure enabling the previously impossible: to clamp the lenses in the clear aperture. The centering spindles are centered with extraordinary accuracy and run even and concentrically. This enables outstanding results at comparably low centering angles.
The clamping chucks are quickly changed via hydro expansion chucks. Consequently, setup times are minimized. This process is fully supported by the sophisticated technology package of the SLC 302.
The special CNC double slide technique allows the simultaneous two-tool processing of the lens. This feature increases the productivity of various processes including simultaneous rough and fine grinding of contours and recesses. Even challenging centering jobs are accomplished quickly and precisely by using double processing capability.
Sophisticated centering technology
Full advantage of the capabilities of the SLC 302 is accomplished by use of various, intelligent software and hardware features:
SCHNEIDER Centering Technology (SCT)
software, allows for freely defined lens contours using built in geometrical modules.
With the integrated technology library, the optimal process steps are selected and illustrated in the graphical menus, enabling easy entry of the geometrical and process parameters.
The Clamping Control contains the CNC-controlled bell-clamping technology. This automatic process control minimizes the setup times. A re-setup of the clamping configuration can be done by loading the corresponding file which contains all relevant clamping parameters like clamping speed, clamping force and clamping position.
The Align Control consists of an integrated interactive laser measuring system to measure and control the centering error. This feature includes a user menu to analyze the centering error and tilting angle, taking the refractive index and the clamping configuration into consideration. The centering error tolerance field is monitored and feeds back to the centering process. Also the zero position is corrected automatically.
The Truncation Control enables CNC-controlled contour processing of non-rotationally symmetric edge geometries for the production of truncations, rectangles, and polygons. Rotationally symmetric and nonsymmetric edge geometries are produced in one working cycle. The corresponding parameters are entered via the dialog menu in the Cartesian coordinate system.
CT Control technology is used for adjustments of the lens geometry according to center thickness deviations and for checking the center thickness according to the predefined tolerance.
The system interfaces to an Ethernet network connection enabling efficient data exchange for setup, data storage and service.
A graphical user interface assists the operator for an easy and fast communication with the SLC 302.
The Spheroline® SLC 302 centering machine is the perfect addition to SCHNEIDER’s Spheroline® SLG 301 grinding and SLP 301 polishing machines.
With the Spheroline® SLC 302 centering machine you have the quality solution for your daily production requirements.
- High centering accuracy
- Simultaneous use of two tools
- Very large working range with one set of tools
- Flexible production of small batches
- Accurate and sensitive CNC controlled clamping
- High repeatability even for restored processes
- Sophisticated process control package
- Computer-assisted setup
- Intelligent analysis system
- Graphical user interface
- Intelligent remote diagnostics
- Central lubrication
working range machine
Ø (10) 30 - 300 mm
number of axes
6 (X1, X2, Z1, Z2, W, C)
X1-, X2-, Z1-, Z2-axis: 0.01 - 7500 mm/min
positioning and repeat accuracy
X1-, X2-, Z1-, Z2-axis: +/- 0.001 mm
positioning and repeat accuracy
C-axis: +/- 4"
W-axis: +/- 0.001 mm
tool spindle connection with clamping chuck
speed range tool spindle
2000 - 4500 min-1
centering spindle connection
top: 25 x 42 HD
bottom: 25 x 42 HD
speed range centering spindle
with C-axis: 1 - 400 min-1
without C-axis: 5 - 730 min-1
Ø max. 180 (210) mm
max. 23 kW
compressed air supply
6 bar (90 psi) min.
2500 kg (5512 lb.)
dimensions without control panel (width x depth x height)
1560 x 2030 x 1250 mm (65 x 82 x 53 inches)