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Cranfield
Precision OGM

ultra-precision freeform optical grinding

The ultra-precision freeform grinding of large optics requires a machine that can offer ultimate stiffness, thermal stability and the flexibility to meet the needs of your application. The Cranfield Precision OGM delivers on all counts.

large optical component Grinding

If you’re looking for a machine capable of ultra-precision freeform grinding of large optics, you’ve come to the right place. The OGM is used to produce freeform mirrors used in extreme ultra-violet semiconductor lithography, as well as mirrors for space telescopes.

Check out our Cranfield Precision OGM flyer to learn more.

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    Advanced software solutions

    The Cranfield Precision OGM is equipped with our MöbiusCAM software. This software performs the computations required to generate associated machine commands and brings additional precision and flexibilty to the machine. Furthermore, this standalone software allows you to select from a number of surface definitions and operations, including:

    • Spheric, aspheric and freeform mode
    • Spiral and raster grinding path modes
    • Edging: circular boundary
    • Edging: non-symmetrical edge profiling
    • Chamfering
    • Light weighting
    • On-machine metrology

    Innovative system to meet your specifications

    The Cranfield Precision OGM also features our minimal hysteresis, and patented vertical axis counterbalance. This innovative system enables us to hold tight specifications, minimize form errors and sub-surface damage.

    additional features

    A number of design features enable us to meet the specific demands of these challenging industries, which include:

    • Hydrostatic bearings for very high stiffness and damping, enabling ultimate precision
    • Twin linear motors, eliminating backlash and ensuring complete control
    • FEA optimized base and bridge
    • 2,500 rev/min work spindle (5,000 RPM optional)
    • 60 rev/min 800 Nm rotary table
    • Direct drive work spindle and rotary table
    • In-situ measuring probe
    • Secondary spindle for I/D & O/D grinding and light-weighting
    • Wheel dressing station

    specifications

     OGM 1200OGM 1600OGM 2500
    MACHINING CAPACITY  

    Max. diameter

    1,200 mm

    1,600 mm

    2,500 mm

    Max. workpiece height capacity

    200 mm

    600 mm

    800 mm

    Max. workpiece mass

    1,200 kg

    1,600 kg

    2,000 kg

    Y AXIS (HORIZONTAL WORKPIECE TRAVEL)  

    Axis stroke

    1,430 mm

    2,000 mm

    2,200 mm

    Min. command resolution

    0.05 μm

    0.05 μm

    0.05 μm

    Max. linear motor force (continuous)

    1,640 N

    1,640 N

    1,640 N

    Max. working feed rate velocity

    3,000 mm/min

    3,000 mm/min

    3,000 mm/min

    Z AXIS (VERTICAL GRINDING WHEEL INFEED)  

    Axis stroke

    275 mm

    455 mm

    655 mm

    Min. command resolution

    0.05 μm

    0.05 μm

    0.05 μm

    Max. working feed rate velocity

    3,000 mm/min

    3,000 mm/min

    3,000 mm/min

    C AXIS (COMPONENT WORK TABLE)  

    Axis rotation (continuous)

    +/- 360°

    +/- 360°

    +/- 360°

    Max. axis velocity

    60 rpm

    60 rpm

    60 rpm

    Encoder resolution

    0.0001°

    0.0001°

    0.0001°

    S1 GRINDING SPINDLE  

    Spindle speed (standard spindle)

    100 - 3,055 rpm

    100 - 3,055 rpm

    100 - 3,055 rpm

    Theoretical stiffness (radius and axial)

    950 N/μm

    950 N/μm

    950 N/μm

    Rated spindle power (continuous)

    20 kW

    20 kW

    20 kW

    Dimensions  

    Dimensions (W x D x H)

    2,180 x 6,000 x 3,050 mm

    2,600 x 7,550 x 3,850 mm

    3,600 x 8,750 x 4,100 mm

    Machine weight

    30,000 kg

    40,000 kg

    55,000 kg

     OGM 1200OGM 1600OGM 2500
    MACHINING CAPACITY  

    Max. diameter

    47"

    63"

    98.4"

    Max. workpiece height capacity

    7.9"

    23.6"

    31.5"

    Max. workpiece mass

    2,646 lb

    3,527 lb

    4,409 lb

    Y AXIS (HORIZONTAL WORKPIECE TRAVEL)  

    Axis stroke

    56.3"

    78.7"

    86.6"

    Min. command resolution

    0.05 μm

    0.05 μm

    0.05 μm

    Max. linear motor force (continuous)

    1,640 N

    1,640 N

    1,640 N

    Max. working feed rate velocity

    118 in/min

    118 in/min

    118 in/min

    Z AXIS (VERTICAL GRINDING WHEEL INFEED)  

    Axis stroke

    10.8"

    18"

    25.8"

    Min. command resolution

    0.05 μm

    0.05 μm

    0.05 μm

    Max. working feed rate velocity

    118 mm/min

    118 mm/min

    118 mm/min

    C AXIS (COMPONENT WORK TABLE)  

    Axis rotation (continuous)

    +/- 360°

    +/- 360°

    +/- 360°

    Max. axis velocity

    60 rpm

    60 rpm

    60 rpm

    Encoder resolution

    0.0001°

    0.0001°

    0.0001°

    S1 GRINDING SPINDLE  

    Spindle speed (standard spindle)

    100 - 3,055 rpm

    100 - 3,055 rpm

    100 - 3,055 rpm

    Theoretical stiffness (radius and axial)

    950 N/μm

    950 N/μm

    950 N/μm

    Rated spindle power (continuous)

    20 kW

    20 kW

    20 kW

    Dimensions  

    Dimensions (W x D x H)

    7’ x 20’ x 10’

    8.5’ x 24.8’ x 12.6’

    11.8’ x 28.7’ x 13.5’

    Machine weight

    66,138.7 lb

    88,185 lb

    121,254 lb