Specifications

60
The use of a thrust stem allows a gage head to
be mounted securely and easily just by drilling
a ø9.5mm hole (or ø18mm for ø15mm stems)
in a plate approximately 10mm thick (see page
33). A dedicated (optional) wrench is available
that fits the wrench-seat at the top of the stem
for holding the gage while the clamping nut is
tightened with a spanner. Ensure that no force
or torque is applied to the cable during this
operation, otherwise damage may be caused.
(4.5)
7.5
15
30
6
A
A-A' section
A-A' section
ø4.5, ø7.5 depth 4.4
16
15(9)
A'
M4x0.7
Unit: mm
Unit: mm
ø8H7
+0.015
0
+0.015
0
7.5
(4.5)
15
30
15
A
A'
M4x0.7
15 (9)
15 (9)
10
20
ø10h7
Slit set at 90 degrees
to setscrew
Example 1
Example 2
ø8h7
+0.0115
0
ø10h7
0
-0.015
1
1
2
2
Quick Guide to Precision Measurement
Before using the gage head
About exporting
• M
itutoyo products are subject to Appended Table 1 of the Export
Trade Control Ordinance. In order to export relevant products, an
application may be required for an export license.
Avoid installing the gage in locations where:
• The gage will be exposed to dir
ect sunlight, or where the ambient
temperature may drop below 0°C or exceed 40°C.
•
The relative humidity may drop below 20%RH or exceed 80%RH, or
where a sudden change in temperature may cause condensation.
•
The gage would be subject to corrosive gas, or where combustible
materials are placed nearby.
•
The gage is subject to air containing significant amounts of dust, salt or
iron powder.
•
The gage is subject to direct vibration or shock.
• The gage may come in contact with splashed water, oil or chemicals.
(The gage system components are not designed for protection against
water, oil or chemical attack, except for the gage unit.)
•
Electronic noise is likely to affect the gage.
Conformance to EC Directive (89/336/EEC)
All Linear Gage series (gage head and display unit) conform to
EN55011:1992, EN50082-2:1995, EN61000-4-2, ENV50140,
ENV50204, ENV50141 and EN61000-4-4.
Preventing electrical interference
• Bundling the sensor cable with high-voltage lines or power lines
may cause the gage to malfunction. The sensor cable run should be
completely separate.
Power supply to the display unit
• If a generic switching r
egulator is used, provide grounding via the
frame’s ground terminal or ground terminal of the power supply.
•
If a malfunction occurs due to superimposed noise on the power-supply
line, use a DC-regulated power supply that incorporates an isolation
transformer.
About grounding
• Avoid sharing the frame ground (F.G.) terminal of this unit with
the high-power line grounding but separately connect it to Class 3
Grounding.
Handling precautions
• This pr
oduct is a precision measuring instrument. Avoid dropping or
otherwise subjecting it to impact.
•
The spindle of the gage head is connected to the body via a spring.
Be careful not to pull the spindle in the extending direction or rotate it
with force. Doing so may cause permanent distortion and damage to
the spring.
•
The gage is shipped with a standard contact point (901312 or 900032
for the inch version of the LGS) installed on the spindle. This contact
point can be replaced with a different type that best suits the shape of
workpiece. (See page 36.)
When installing or removing a contact point, place the wrench provided
on the catch in order to keep the spindle from rotating. Then grip the
contact point with pliers to install or remove it.
When gripping the contact point with pliers, insert a piece of felt or
other soft packing between the jaws and the point to protect it from
damage.
Gage head mounting precautions
The illustrations below highlight the mounting precautions that should
be observed when a gage head or counter is used.
All models of gage head
• Mount the gage on a fixtur
e or stand by using its stem only.
• Be careful not to over-tighten the stem. Doing so may cause problems
in gage operation.
•
Never fasten the gage by placing the tip of a screw directly against the
stem.
• Never fasten the gage by any section other than its stem.
• Mount the gage in such a way that its stem is in line with the direction
of measurement required. If installed at an angle to this direction,
measurement errors will occur.
•
Be careful not to exert force on the gage via the cables. Exercise due
care especially when using an additional extension cable.
Examples of the plain-stem mount
• T
he recommended clamping torque is 0.4 to 0.5Nm. Over-tightening the
stem clamp will prevent smooth movement of the spindle. Ensure the
spindle can move freely after clamping.
LGK, LGF and LGD models