Spinstand S-1701A

  • Improved dynamic characteristics result in shorter settling times.
  • Micropositioning system with positioning repeatability1 of 1 µInch.
  • Software controlled skew angle conversion without track repositioning.
  • Easy conversion between head (HGA) and head stack (HSA) testing.
  • Field convertible between clockwise and counter clockwise rotation .

Guzik S-1701A Micro Positioning Spinstand is dynamically improved over its predecessors 1701MP and 1701CF. It is equipped with a patented closed loop positioning system consisting of a piezo substage and precision optical scales with 0.04 µInch resolution.

This results in track positioning repeatability of 1 microinch and track profile measurements with effectively zero hysteresis. This capability is a requirement in MR-Head testing and high TPI track profile and track interference analysis.

S-1701A provides software controlled skew angle adjustment through a patented3 software controlled mechanical configuration. Since the head gap is located in the center of a rotational system, skew angle control is accomplished by rotating the head around the head gap. In this manner the skew angle can be changed up to 45 while remaining on the same track.

The unique capability of changing skew angles while remaining on track allows the user to perform a variety of measurements, including track profile analysis on a previously written track at varying skew angles. This unique measurement can produce a comb-shaped single-track profile plot.

Through a very simple mechanical conversion, S-1701A can be used for either head (HGA) or head stack (HSA) testing.

Features

  • Settling time improved by 50% compared to 1701MP and 312MP.
  • Simultaneous and synchronous rotary and linear stage movements provide correct skew angles at all positions on the disk.
  • Universal Micro Positioning Spinstand equipped for HGA, HSA, and Disk testing.
  • Positioning repeatability of 1 µInch with optical scale resolution of 0.04 µInch.
  • Software controlled skew angles of *45*.
  • Optional clockwise (mirror) head loader allows testing bottom heads on the top.
  • Interchangeable Head Stack (HSA) fixture can be designed to custom specifications.
  • Interchangeable "Z-height" adapters, HGA mounting fixtures, and spindle chucks (disk sizes from 1.3" to 3.5").
  • Air bearing spindles available with programmable speeds 100 - 20,000 RPM.
  • Optional optical alignment system available for head gap alignment within .001 Inch to the center of the rotary system.
  • Table top unit.

Positioning Mechanism

Linear Position Repeatability and Local Positioning Accuracy: ± 0.4 µInch typical, ±1 µInch maximum
Absolute Positioning Accuracy Over the Entire Linear Travel : ± 8 µInch typical
Linear Scale Resolution: 0.04 µInch
Hysteresis: Closed loop system, no hysteresis
Skew Angle Range: ± 45 degrees, software programmable
Skew Angle Resolution: 1 minute of arc. Physical Size: 24" x 12" x 18"
Weight: 175 lbs
Power: 110 VAC ±15% 50/60 Hz, 3 A approximately
Power: 230 VAC ± 15% 50/60 Hz, 2 A approximately

Environmental

Operational: 15° C to 40° C, 90% maximum relative humidity, with no condensation

Air Bearing Spindle

Interchangeable Spindle Chucks: 1.3", 1.8", 2.5", 3.5" available
Motor: Brushless DC, programmable, 100 RPM - 20,000 RPM
RPM Jitter: 0.005% typical
Acceleration: 0 - 10,000 RPM in approximately 3.25 seconds with 3.5" disk mounted
  • 20 MHz signal was written on the track.
  • The amplitude of the read signal was measured at 10 µIn increments across the track in both forward and backward directions.
  • The resulting Track Profile Plot displays forward, backward, and average results of this measurement. This demonstrates 1 µInch positioning accuracy and zero hysteresis of the Guzik S-1701A spinstand.

  • After a band erase, 20 MHz signal was written on the track at -15° skew angle using a Guzik S-1701A spinstand.
  • The skew angle of the head gap was changed to 15°
  • Track Profile at this skew angle was measured ON THE SAME TRACK at 5 µI increments. This measurement was performed in both the forward and backward directions. The resulting comb-shaped single-track profile plot displays the amplitude interference introduced by the angle between the magnetic transitions on the track and the head gap.

    • Settling time is 4.5 ms for a 50 µInch movement (settling tolerance is 1 µInch).