25
Technical Information
Detector
head
Radius: 50mm or larger
Fixing
Fixing
Flexible cover
Radius: 100mm or larger
Detector
head
Signal cable layout
It is important to keep in mind the following points when deciding on the
layout scheme for signal cables.
When the cable is fixed
The radius of curvature of the signal
CABLE¬MUST¬BE¬LARGER¬THAN¬MM
Resonance point of Linear Scale
Each object has a natural frequency, depending on its shape, length, and the
type of material. The Linear Scale frame is not an exception. It has its natural
frequency and thereby resonates at a certain frequency. In general, this will
not cause a problem, since a machine tool and the Linear Scale frame have
different natural frequencies under normal machining conditions. However,
should the natural frequency of the machine tool body and the Linear Scale
COINCIDE¬THE¬FOLLOWING¬COUNTERMEASURES¬CAN¬BE¬TAKEN
¬)NCREASE¬RIGIDITY¬OF¬THE¬MOUNTING¬BRACKET¬FOR¬THE¬SCALE
2. Add a mid-support to the middle of the scale to shift its resonance point
higher.
3. Mount the Linear Scale at a place where vibrations from the machine tool
cannot be easily transmitted.
4. Limit the machine process conditions to be within a specific range in
which the natural frequencies of the machine tool and the scale do not
coincide.
Other considerations
The signal cable is durable enough to withstand repeated bending up
to approximately 2 million times (when the bending radius is limited to
MORE¬THAN¬MM ¬7HEN¬REPEATED¬BENDING¬EXCEEDING¬ ¬MILLION¬TIMES¬IS¬
expected, the signal cable should be considered as a consumable part. In
such a case, carrying a spare cable will allow immediate replacement when
necessary and so minimize machine downtime.
Note
) It is important to ensure that the signal cable does not interfere with, and is not chafed by, any part of the
machine.
When the cable is movable
When the detector head is the
moving element, it carries the signal
cable with it during operation. Take
care, in such a case, that the radius
of curvature of the signal cable is not
SMALLER¬THAN¬MM¬AND¬EXCESSIVE¬FORCE¬IS¬NOT¬APPLIED¬TO¬THE¬CABLE¬)T¬IS¬A¬
GOOD¬IDEA¬TO¬PROTECT¬THE¬CABLE¬WITH¬A¬mEXIBLE¬SUPPORT¬COVER
Air supply components
Note
) Replace air filter
①
and the elements of mist separator
②
and micro-mist separator
③
once a year or if a change
in pressure at differential pressure gage
⑥
¬REACHES¬-0¬
APPROX¬KGCM
2
).
The air supply components listed in the
table at left can be used to supply air to
linear scales on 3 to 4 axes. If air is supplied
TO¬LINEAR¬SCALES¬ON¬MULTIPLE¬AXES¬ATTACH¬mOW¬
regulating valve
⑤
¬DIRECTLY¬TO¬AN¬AIR¬INLET¬ON¬EACH¬SCALE¬EITHER¬-¬TAPPED¬
holes on both sides of each scale).
Air filter
2 Mist separator
3 Micro-mist separator
4 Regulator
Flow regulating valve
6 Differential pressure gage
7 Pressure gage
Scale
main unit
Detector
head
Rubber seal
15mm or less
Apply silicone grease to the
overall length with a soft, lint-free cloth
Greasing
Linear Scale evaluation methods
s¬4ESTING¬WITHIN¬THE¬OPERATING¬TEMPERATURE¬RANGE
Testing has proven that there is no abnormality of functions and signals when
the Linear Scale is used within the specified operating temperature range.
s¬4EMPERATURE¬CYCLE¬DYNAMIC¬CHARACTERISTICS ¬TEST
Testing has proven that there is no abnormality when the Linear Scale is
used under the condition where the ambient temperature continuously
changes within the specified range.
s¬6IBRATION¬TEST¬3WEEP¬TEST
Testing has proven that the Linear Scale functions without abnormality
when subject to vibration within the frequency range 30Hz to 300Hz at a
maximum acceleration of 3g.
s¬.OISE¬TEST
¬ )N¬ACCORDANCE¬WITH¬THE¬%-# ¬$ IRECTIVES¬%. !
s¬#RATE¬$ROP¬4EST
¬ )N¬ACCORDANCE¬WITH¬THE¬HEAVY¬EQUIPMENT¬DROP¬TEST¬*)3: ¬SPECIlED¬IN¬
the JIS standard.
Maintenance of dust-proof seals
In order to maintain and extend the life of the dust-proof rubber seals, it
is recommended that a small amount of silicon lubricant be applied to the
contact area between the rubber and the detector head once a year.
Constructional features of the Linear Scale
Joint Structure of Detector
A ball joint structure is employed at the contact area between the detector
head and the slider (sensor unit) inside the scale. This arrangement prevents
the slider movement from deviating from the
normal moving directions when the detector
head is slightly misaligned transversely, thus
providing a normal scale reading and increasing
mEXIBILITY¬IN¬THE¬SCALE¬INSTALLATION¬)N¬ADDITION¬
this structure is highly rigid and therefore has
excellent durability.
Water-proof Connector
A waterproof/splash-proof connector is used to enable separation of the
signal cable. Thus, installation and maintenance of the Linear Scale can be
EASILY¬PERFORMED¬4HE¬SIGNAL¬CABLE¬ON¬THE¬!4¬CANNOT¬BE¬SEPARATED
Conduit armored type signal cable
The signal cable is protected by the conduit system. Its exterior is made of
stainless steel, which is corrosion-resistant and withstands continuous use.
Unique rubber seals
The slider is shaped to glide smoothly through the
rubber-seal opening – almost like the keel of a boat
through water.
Excellent splash- and dust-proof rubber-seal structure
The rubber seals are made of a strong, special urethane, and wires are
inserted in these seals to improve the splash-proofing and dust-proofing of
THE¬SCALE¬!4 ¬ONLY
Sensor
Joint bar
Spring
Detector head
