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High capacity
High Capacity Air Bearing Spindle

Seagull's High Capacity Air Bearing Spindle blends strength and beauty in combining stronger/stiffer air films that are used efficiently to support demanding applications including servo writing with twenty or more disks.  A zero cogging motor and the capability of 30,000 RPM provides shorter processing times and higher throughput.  Please refer to the Seagull white paper for additional information and testing results.

Features as shown:

1) 2.95"od cartrige construction (mounting flange not shown)
2) Long Stainless Steel rotor thermally optimised for peak performance)
3) Air film stiffness matched to rotor stiffness
4) Center mounted zero cogging motor for exceptional motion control
5) Close coupled 1024 optical encoder for solid velocity feedback control
6) Evacuation Ring standard for exceptional particulation control
7) Filter provided for clamp circuit protection (see at right)
8) Crashproof Stainless Steel Construction

Spindle specifications (high capacity)
Speed (max) 30,000rpm
Axial rotational error (repeatable) <20 µ in
Axial rotational error (non-repeatable) <1 µ in
Radial rotational error (repeatable) <20 µ in
Radial rotational error (non-repeatable) <1 µ in
Maximum Axial load 90 lbs
Maximum Radial load (dual plane) 84 lbs
Maximum Radial load (single plane) 42 lbs
Axial stiffness 80,000 lbs/inch
Radial stiffness (dual plane) 800,000 lbs/inch
Radial stiffness (single plane) 400,000 lbs/inch
Angular stiffness 3,200,000 in-lbs
Polar inertia (spindle only) .028 oz-in-sec²
working air gap .00023± .00004

High cap cross section