Here is the preview url to copy
+

https://www.fivesgroup.com/preview
Skip to main content

Cranfield
Precision TTG

ultra-precision
freeform optics
grinding

With high stiffness, damping, and thermal stability built in, the Cranfield Precision TTG is the ultra-precision aspheric and freeform optics grinding solution. Engineered specifically for speciality optics and molds, medical and aerospace components.

Unique patented highly symmetric machine configuration

The Cranfield Precision TTG benefits from a symmetric machine configuration that gives you the utmost flexibility and precision in freeform optics grinding. 

To further optimize stiffness, the rotary axes have large hydrostatic thrust bearings mounted directly on the machine base. This gives highly stiff, damped axes an excellent bearing ratio in all directions for ultimate precision and repeatability.

Check out our Cranfield Precision TTG flyer to learn more.

Download

 

    Optimal flexibility

    To ensure you get the most operational capabilities out of your investment, we have also engineered this machine for optimum functional flexibility. It is capable of optical grinding and diamond turning with very low sub-surface damage, micro-milling and pre-polishing, all on the same platform.

    In addition, the Cranfield Precision TTG 350 has the capacity to produce components up to 350mm in diameter.

    Precise and flexible

    The Cranfield Precision TTG achieves precision grinding of complex freeform surfaces thanks to the precise interpolation control of the two rotary turret axes. These axes work in combination with the linear axis and the rotary component workhead.

    In addition, our advanced software package, MöbiusCAM, brings further precision and flexibility to the machine. The software is designed to facilitate programming for ultra-precise optics grinding and on-machine metrology.

     

    process options include:

    • Plunge mode: Plano, spheres (concave / convex)
    • Generate mode: concave / convex aspheres, spheres
    • Freeform mode: Surface generation
    • Edging: Circular boundary
    • Edging: Non symmetrical edge profiling
    • Chamfering: (circular boundary)
    • Coring
    • Flat Milling
    • Scooping
    • Slicing and dicing
    • Prism cutting/grinding
    • Milling
    • Diamond turning
    • Hard turning
    • Pre-polishing

    EXCEPTIONAL THERMAL STABILITY

    The Cranfield Precision TTG is designed for thermal stability from the ground up. Even the machine base is thermally isolated.

    This focus is carried all the way through the machine’s design, and then further enhanced by the temperature-controlled hydrostatic bearing oil. In turn, this ensures the optimum working temperature of the machine components at all times.
     

    specifications

     
    Grinding capacity

    Max. grinding diameter (OD)

    350 mm

    Linear axis stroke

    150 mm

    Max. workpiece weight

    25 kg

     

    TOOL SPINDLE TURRET

    Swivel range

    +/- 135o

    Turret bearing

    Hydrostatic

    Max. number of spindles

    4

    Grinding spindle bearings

    Air

    Max. wheel Ø

    140 mm

    Max. wheel width

    12 mm

    Wheel surface speed

    100 m/sec

    Max. grinding spindle power

    16 kW

    Max. grinding spindle speed

    80,000 rpm

     
     
    WORK SPINDLE TURRET

    Swivel range

    +/- 135o

    Turret bearing

    Hydrostatic

    C-axis

    Hydrostatic (air option)

    Workhead speed

    1 - 3,000 rpm

    Linear axis travel (infeed)

    150 mm

     

    Dimensions

    Machine dimensions (W x D x H)

    1,800 x 1,950 x 2,500 mm

    Machine weight

    3,500 kg


     

     
    Grinding capacity

    Max. grinding diameter (OD)

    13.8"

    Linear axis stroke

    5.9"

    Max. workpiece weight

    55 lb

     

    TOOL SPINDLE TURRET

    Swivel range

    +/- 135o

    Turret bearing

    Hydrostatic

    Max. number of spindles

    4

    Grinding spindle bearings

    Air

    Max. wheel Ø

    5.7"

    Max. wheel width

    0.5"

    Wheel surface speed

    328 ft/sec

    Max. grinding spindle power

    16 kW

    Max. grinding spindle speed

    80,000 rpm

     
     
    WORK SPINDLE TURRET

    Swivel range

    +/- 135o

    Turret bearing

    Hydrostatic

    C-axis

    Hydrostatic (air option)

    Workhead speed

    1 - 3,000 rpm

    Linear axis travel (infeed)

    5.9"

     

    Dimensions

    Machine dimensions (W x D x H)

    5.9' x 6.4' x 8.2'

    Machine weight

    7,716 lb