Instrument Bearings
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The
instrument bearing normally takes the form of single row deep groove ball
bearing. Miniature bearings carry the largest sizes. They usually have
precise and critical tolerance, radial clearance and lubrication
requirements that should never be deviated from. Even the smallest changes
can yield differing results with instrumentation. They have a low uniform
operating torque, limited vibration and controlled contact angles.
Instrument bearings are used in gyro motors, gimbals, gear-heads,
differentials, data encoders, potentiometers, tape guides and idlers, tape
capstans, and flow meters. All applications require low operating torque.
Thus, instrument bearings generally have lightweight retainers and open race
curvatures for minimum contact area. Instrument bearings do not fail from
metal fatigue but change in the level of operating torque that affects
instrument performance.
The construction of these bearings enables them to carry moderate radial
and thrust loads. Miniature bearings are also available flanged, or
unflanged. To ensure optimal speed and load carrying capacity factors like
ring material, design, shields and seals, cage, radial play, and lubricant
should be minutely considered.
Proper selection of a bearing cage is critical for load, speed and
temperature requirements. The design of instrument ball bearings are
critical in determining their load-carrying capability and maximum operating
speed. Radial play is the free internal radial looseness between the balls
and the races with no load applied to the bearing in any direction. This is
necessary to accommodate differential thermal expansions and to control
axial play and deflection.
