| Crash-Proof
Design |
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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
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| Micropositioning
in Servo and Non-Servo Modes |
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| 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. |
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| New
Linear Scale Interpolator |
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| 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). |
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| 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. |
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| 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
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| 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)
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