SLC 202

Efficient centering of precision optics



Efficient centering can add significant value to your precision optics without raising costs per lens noticeably. We have accomplished this goal with a flexible and very accurate solution – the SCHNEIDER SLC 202 centering machine.

Resting on very stable 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 202 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. Freely defined lens contours are easily accomplished by using the SCHNEIDER Centering Technology software SCT.

Solid foundation
The SLC 202 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 measuringtechnique.

SCHNEIDER’s proprietary wear-free precision clamping bells 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 bells 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 202.

Dual processing
The special CNC double slide technique allows the two-tool processing of the lens like rough and fine grinding. Popular use of this feature also includes simultaneous contour and recess processing. 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 202 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 non-symmetric 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.

Data communication
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 202.
The Spheroline® SLC 202 centering machine is the perfect addition to the Spheroline® SLGgrinding and SLP polishing machines.

With the Spheroline® SLC 202 centering machine you have the quality solution for your daily production requirements.

Technical Data

measuring accuracy

W-axis: +/- 0.001 mm

number of axes

6 (X1, X2, Z1, Z2, W, C)

positioning and repeat accuracy

C-axis: +/- 4"

positioning and repeat accuracy

X1-, X2-, Z1-, Z2-axis: +/- 0.001 mm

feed rate

X1-, X2-, Z1-, Z2-axis: 0.01 - 7500 mm/min

working range machine

Ø (10) 30 - 200 mm

tool spindle connection with clamping chuck

SK 30

speed range tool spindle

2000 - 3500 min-1

centering spindle connection

top: 25 x 42 HD

bottom: 25 x 42 HD

speed range centering spindle

with C-axis: 1 - 140 min-1

without C-axis: 5 - 250 min-1

grinding wheels

Ø max. 180 (210) mm

power requirement

23 kW max.

compressed air supply

6 bar (90 psi) min.


about 2500 kg (5512 lb.)

dimensions without control panel (width x depth x height)

1560 x 2030 x 1250 mm (62 x 80 x 50 inches)


  SLC 202
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