Spinstand V2002

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Crashproof XY-Positioning to protect spindle
  • Piezo actuator with ±0.012 µInch (±0.3 nm) positioning accuracy
  • Supports Embedded Servo Revision 2 and 3
  • Positioning repeatability* of 0.05–0.11 µInch (1.3–2.8 nm) Peak-to-Peak deviation of track profile slope
  • Non-Repeatable Runout* (NRRO) in Servo mode 0.04-0.07 µInch (1.0-1.8 nm), 1 sigma
  • Disk center coordinates measurement with 0.4 µInch (10 µm) accuracy in less then 2 sec
  • Mounting both up-facing and down-facing heads from the top
  • Separate mounting platforms for the up facing and down facing heads
  • Controlled by PC via high-speed USB 2.0 interface

    • Guzik Technical Enterprises introduces a new model – Guzik V2002 XY-positioning spinstand. The spinstand uses the X and Y coarse positioning stages actuated by linear motors and the micropositioning stage actuated by the piezo element aligned with X coordinate axis to place the tested head on the specified track. WITE32 software converts the requested track number and skew angle into X and Y coordinates.
    Guzik V2002 spinstand is created for testing Head Gimbal Assemblies (HGA), Head Stack Assemblies (HSA), Head A Assemblies (HAA), as well as for the media testing.

    * Typical parameter value

     
      Crash-Proof Design  

    Guzik V2002 is a crash-proof spinstand due to the new patent pending design of the Head Loading Mechanism HLM-V2002. The arms of the V-shaped HLM-V2002 are rotated 45 degrees in respect to the X and Y coordinate axes of the spinstand. Such geometrical configuration and the mechanical limit on the movement along the Y axis set the working area over the lower quadrant of a media (see Figure 1). This prevents the cartridge from the collision into the spindle/media when the mechanical parameters of the spinstand or the head geometry are specified incorrectly in the software.


    Figure 1: Working Area of HLM-V2002

    		  
      Micropositioning in Servo and Non-Servo Modes  

    Guzik V2002 spinstand can use one of the two following modes for the head positioning:

    • Non-servo mode, when the actuation is done by a piezo element with the feedback from the glass linear scale.
    • Embedded servo mode, when the actuation is performed by the piezo element, with the feedback from the servo bursts written on the same track with the data signal. These bursts are located at the beginning of every sector. Guzik V2002 spinstand supports sector sampling rates up to 50 kHz (20 µs).

    Using the servo mode assures the high positioning repeatability. The head suspension and some spinstand parts expand when temperature changes during the measurements. The embedded servo eliminates the positioning errors caused by this thermal expansion. The spinstand in the servo mode also suppresses low-frequency vibrations transmitted from the floor.
    The track profile repeatability observed on the Guzik V2002 spinstand in the servo mode is 0.05 – 0.11 µInch (1.3 – 2.8 nm). The typical non-repeatable runout (NRRO), measured as 1 sigma of the Position Error Signal (PES) from the servo bursts, is 0.04-0.07 µInch (1.0-1.8 nm). Repeatability and NRRO significantly depend upon the particular head and media used but are consistent for the same head type. The data above was obtained using the 80 Gbit/Inch2 product.

    		  
      New Linear Scale Interpolator  
    Guzik V2002 spinstand features a new linear scale interpolator developed at Guzik Technical Enterprises. The spinstand with 2 µm period glass scales and the interpolator has the measurement accuracy ±0.012 µInch (±0.3 nm).  
      New Features  
    Guzik V2002 spinstand performs software controlled alignment for each tested head. The alignment procedure takes two seconds and measures the position of the disk center with accuracy 0.4 µInch (10 µm). The results can be improved by averaging. The procedure increases the accuracy of track and skew angle positioning. As a result, Guzik V2002 spinstand achieves a higher accuracy of WROffset, Writer Width, and Reader Width measurements.
    There are no head amplifier boards on the cartridges for Head Loading Mechanism HLM-V2002. The new cartridge design integrates a simple board with the head connector. The head amplifier boards were removed from the cartridges and installed on the swinging platforms of HLM-V2002 without sacrificing electrical performance.
    Guzik V2002 spinstand can be used for head (HGA, HAA) testing and, after a simple mechanical conversion, for headstack (HSA) testing. Guzik Technical Enterprises offers field upgradeable toolings for specific HGA, HAA, and HSA designs.    		  
      Features and Specifications**:  

    Air Bearing Spindle

    • Motor: Brushless DC, programmable 100 RPM - 20,000 RPM
    • Interchangeable Spindle Chucks: 1.0", 1.8", 2.5", and 3.0”/3.5" available
    • RPM Jitter: 0.005% typical
    • Acceleration: 0 - 10,000 RPM in approximately 3.25 sec with 3.5" disk mounted
    • Balancing: Included as standard
    • Shroud: Included as standard

    Coarse Positioning Mechanism

    • Actuator Type: X and Y linear motors
    • Movement Type: Simultaneous dependent XY trajectory movement
    • Skew Angle Control: Software controlled skew angles

    Micro-Positioning Mechanism

    • Micro-Positioning Encoder Type: Heidenhain glass scale encoder and embedded servo
    • Servo Revision: Supports Revision 2 and 3
    • Actuator Type: Piezo Element
    • Local Micro-Positioning Accuracy of Glass Scale within Piezo Range: ±0.012 µInch (±0.3 nm)
    • Position Repeatability: 0.05 – 0.11 µInch / 1.3 – 2.8 nm typical, measured as maximum deviation of the track profile slope in servo mode (7200 RPM, 80 Gbit/Inch2 heads)
    • Non-Repeatable Runout: 0.04-0.07 µInch / 1.0-1.8 nm typical, 1 sigma (7200 RPM, 80 Gbit/Inch2 heads)
    • Hysteresis: Closed loop system, no hysteresis

    Head Loading Mechanism

    • HGA, HAA, and HSA tooling
    • Tooling can be designed to custom specifications

    Spinstand Electronics

    • Separate Control Box and Spinstand Frame for electrical and mechanical noise reduction
    • Control Box Type: SCB V2002 control box
    • Connection to PC: USB ver. 2.0 with data transfer rates up to 480 Mbit/s

    Physical

    Spinstand Control Box
    Size: 32" x 19" x 17" Size: 18" x 18" x 8"
    Weight: 256 lbs Weight: 36 lbs

    Operational

    • Environmental: 15° C to 40° C, 90% maximum relative humidity, with no condensation, clean room environment
    • Power Supply: 110 VAC ±15% 50/60 Hz, 3 A approximately
      230 VAC ±15% 50/60 Hz, 2 A approximately
    • Air Supply: 95 PSI minimum

    ** Specifications are subject to change without notice

    		  
      Performance Measurements:  

    The Track Profile Plot on Figure 2 demonstrates the typical 0.05 – 0.11 µInch positioning repeatability of the Guzik V2002 spinstand. Signal was written on the track and the amplitude of the read signal was measured at 0.6 µInch (15 nm) increments across the track. The measurements were repeated 50 times in forward direction, and 50 times in backward direction.


    Figure 2: Normalized Track Profile Plot (50 Runs Forward + 50 Runs Backward)