Fast Tool Servo

fast tool servo 5000
  • FTS 5000 +


    FTS systems provide a rapid method to fabricate freeform surfaces including: light management micro-structures, toric optics, and mechanical features in contact lenses, lens arrays and laser collimators. FTS cutting is typically 10-15 times faster than other servo tool cutting methods (e.g. XZC machining).

    With the FTS 5000 Precitech is once again defining the state of the art of ultra-precision machining. It addresses the emerging needs of many new markets, including Head-up-displays (HUD) and Virtual Reality (VR).

    Five millimeters of travel and an unprecedented peak acceleration of 40 g’s are a combination unmatched in the industry. This translates into significantly faster production of higher-complexity parts.

    At the same time the FTS 5000 tractor fits in a compact package the size of a standard tool holder, saving machine space. It integrates seamlessly with current Precitech machining centers.


    Benefits
    • Make parts 3x faster than competitive products with unprecedented peak acceleration of 40 g’s
    • Save valuable tool space with compact footprint (equal to a standard tool holder)
    • Expand your product portfolio with 5 mm of travel
    • Ease of use enabled by seamless integration with the machine controller via the FastCom III controller

    Key Specifications
    Typical performance Surface roughness < 4 nm Sa
    Form accuracy < 0.3 μm P-V
    Peak acceleration 400 m/sec2 (40 g's)
    Continuous acceleration 250 m/sec2 (25 g's)
    Travel 5000 μm
    Typical acceleration 2000 μm @ 100 Hz
    1000 μm @140 Hz
    250 μm @ 280 Hz
    100 μm @ 440 Hz

    Dynamic Step Response Control (DSRC)

    Traditional fast tool servos will become unstable and fault at command steps greater than 20 µm. Exclusively available on the FTS 5000, DSRC increases the size of the allowable step command to up to 350 µm. It also drastically decreases response time to a step change in velocity, which is common in lens array applications.

    DSRC off full fast tool servo

    Position in response to a 10 and 17 μm step change with DSRC off. Note the rapid (~0.2 ms) settling time for the 10 µm step and the onsetting of instability at the 17 µm step.


    DSRC on full fast tool servo

    Position in response to a 10, 17, and 350 µm step change with DSRC on. Note the elimination of the 17 µm step instability and the stable response for the 350 µm step.

  • FTS 70/35 +


    The FTS 35 has 35 μm of usable stroke and a maximum operating frequency of 1 kHz. The FTS 70 has a 70 μm stroke and a max operating frequency of 900 Hz. Tool movement is actuated by a piezo ceramic device and position feedback is provided by capacitive gage at 0.5 nm resolution. The FTS 70/35 use “one to one” piezo movement to tool movement technology with high stiffness flexures maximizing tool moment stiffness.


    Key Specifications
    Model FTS 70 FTS 35
    Travel 70 µm ≈ 100 Hz 35 µm ≈ 140 Hz
    Peak Acceleration 3000 m/s2 5000 m/s2
    Typical Form  < 0.3 µm PV < 0.2 µm PV
    Typical Finish < 3 nm Sa < 2 nm Sa
    Servo Band Width 900 Hz 1000 Hz
    FastCom Control System
    Operating System Windows 7
    DSP Sharc ADSP
    Typical Position Command Update Rate 20 - 35 kHz
    D to A Converter 18 bit ultra-low noise
    Update time jitter < 50 ns
    GUI Windows based UPx style
    Two Optional Packages
    Fiducial Library - programming objects defining the cutting path for frequently used fiducial (alighnment) marks
    20th order aspheric lens arrays with blend zones and on-the-fly tool compensation
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