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Realizing outstanding motion accuracy with high rigidity and
load capacity—High-Accuracy Series high-performance linear
guides, HA Type and HS Type

Trends toward higher performance and enhanced quality of electronics equipment and precision instruments have been
accelerating. At the same time, demand has been growing for highly precise production systems that manufacture such
equipment and instruments. NSK strives to always stay ahead of competition by providing the industry with products
that keep pace with trends and needs of the times. Part of these products are the high-performance linear guides, High-
Accuracy Series. The innovative design makes full use of NSK’s world-class proprietary technologies to achieve high
motion accuracy, high rigidity and high load capacity while reducing frictional resistance.
The High-Accuracy Series is available for machine tools such as machining centers and high-precision lathes, as well as
for high-precision instruments for manufacturing semi-conductors and liquid crystal displays, among other applications,
all of which are required to meet the ever-increasing demand for higher accuracy. These linear
guides are therefore well-suited for a broad variety of machinery and equipment that are
expected to deliver high-level performance.

Features

1. High motion accuracy

High motion accuracy is achieved in both narrow and wide ranges by
adopting ultra-long ball slides and optimum design features for the ball
recirculation component.

2. Ball passage vibration reduced to one-third
of our conventional models

Tests show ball passage vibration has been reduced to one-third of our
conventional models, dramatically improving table straightness.

3. Installation of rail with greater accuracy

Increased counterbore depth of the rail mounting hole reduces rail
deflection, which is caused by bolt tightening when fixing the rail to the
base component, to 50% or less. This feature restrains the pitching
motion of ball slide whose frequency matches to the mounting hole pitch.
In addition, the length of mounting hole pitch has been reduced by one-
half of the conventional models, so the rail can be more accurately
installed in position.

4. High rigidity and load capacity with lower friction

High rigidity, high load capacity and low friction are achieved by
increasing the number of balls.

5. Compact design

Reduced body size enables more compact machinery.

Table 1 Examples of High-Accuracy Series applications (based on actual results)

Application Adverse effects from ball passage vibration Advantages of High-Accuracy Series
Machining center, grinding
machine, dicer, and slicer Poor finish of worked surface ● Ultra-long ball slides control posture changes in
Coater (linear motion type) bearing which may be caused by ball passage
Uneven coated surface of resist vibration and rail waviness.
Plastics processing equipment Flaw nearly twice as large as ball diameter
in pitch occurs in worked surface ● Optimum design of ball recirculation components
High-precision table Deterioration in motion accuracy of table enables the ball to move smoothly and restrain
ball passage vibration.

● Deep counterbore of mounting hole for rail
contributes to reducing possible rail deformation
and restricting ball slide pitching motion.

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