Specifications

What is Magnescale?
A scale is mainly used for machine tools and detects the
position of a component such as the stage to which it is installed.
Feeding back position information from the scale eliminates errors caused
by the following and enables more precise machining to be accomplished.
In order to maximize the performance of the scale mounted on a
machine tool, it is vitally important to keep a scale signal constant.
Magnescale
®
possesses environmental resistance against contamination
by condensation or oil, which makes the signal unstable causing signal errors.
Thus, Magnescale
®
is suitable for high-precision position detection.
Thermal
expansion of a
ball screw
Pitch
error of a
ball screw
Backlash
The advantage of scales
Mounting allowance
Magnescale is constructed so
that the sensor for signal
detection slides along the guide
in the scale with bearings to
detect the position. Therefore, it
can perform stable,
high-precision detection even in
the presence of a positional
deviation of the scale or head
caused by installation or
disagreement in parallelism with
the machine guides.
Vibration and impact
resistance
Magnescale primarily uses
ferrous members as the housing
material to protect the detector
section, thereby realizing the
high vibration resistance and
impact resistance characteristics.
In the SR80 series, furthermore,
it employs multi-point fixation
construction in addition to the
housing with high rigidity,
achieving the industry’s top
class vibration resistance and
impact resistance.
Thermal characteristics
Magnescale have the same
linear expansion coefficient as
that of cast iron used for the
structure of general machine
tools. Therefore, it exhibits the
same behavior as the
equipment in which it is
installed even in environments
where temperature changes,
making very stable control
possible. In particular, the SR80
series scales can be installed in
close contact with the
equipment; heat exchange with
the equipment is effectively
achieved, enabling them to
attain consistent accuracy even
in an environment in which
temperature changes occur.
Resistant to condensation
and oil
Magnescale employs the
magnetic detection principle,
thus far less affected by the
condensation or oil problems
inherent in machine tools and
making stable and high
precision operation possible in
severe environments.
Scale construction
The magnetic signal detection
sensor is supported by a
bearing, maintaining a
non-contact status with respect
to the scale material. This
bearing runs on the guide
incorporated in the scale and
detects the equipment’s
traveling distance. Therefore,
the sensor has very small
sliding resistance, enabling the
scale to be used even for
equipment with small driving
force. Moreover, the use of a
specially constructed sealing
structure helps to prevent dust
and dirt from entering inside the
scale. In addition, air purging
the scale provides further
protection.
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