Mitutoyo LGK Series Instruction manual

Foreword
To obtain the highest performance and the longest service life from your
Linear Gage, carefully read this manual thoroughly prior to setup and
operation. After reading this manual keep it near the Linear Gage for quick
reference. The specifications of this gage and the description in this
manual are subject to change without prior notification.
Safety Precautions
To ensure operator safety, use the instrument in conformance with the
directions and specifications given in this User’s Manual.
Precautions for Use
Carefully avoid the following attempts to protect the instrument from failure
and malfunction.
IMPORTANT
Do not apply sudden shocks including a drop or excessive force to the
linear gage.
Do not disassemble or modify the gage.
Do not use and store the gage at sites where it is exposed to direct
sunlight or at extremely hot or cold sites.
To use the gage highly accurately, avoid sites where the temperature
will change abruptly.
Absolutely do not apply an electric engraver to the gage. The high
voltage may damage electronic parts. Also, do not use the gage at sites
where it is subject to large electronic noises.
Do not exert load on the spindle in the perpendicular direction and do
not twist the spindle.
Do not clamp the stem too tightly, since the spindle will not move
smoothly.
Do not apply excessive tension to the cable or do not bend it forcibly.
To perform stable measurement, allow at least 10 minutes after turning
on the power.
Do not set up the origin point at either end of the stroke.
If the gage is used in combination with other instruments, the maximum
performance could not be obtained depending on environmental and
operating conditions. Take those conditions into consideration prior to
use.
The functions and performance will not be guaranteed, if the gage is
used in other conditions than those specified.
Take sufficient damage-preventive processing (safety measures),
should this gage have been at fault.
Caution
Please be careful enough when handling the knife edge or blade
type contact point, since there is a possibility of injury at exchange
and use.
Electromagnetic Compatibility (EMC)
This product complies with the EMC Directive. Note that in environments
where electromagnetic interference exceeds EMC requirements defined in
this directive, appropriate countermeasures are required to assure the
product performance.
1. Name and Dimension of Each Part
2. Mounting the Gage
(1)To mount the gage on another instrument or a fixture, clamp the φ8 stem.
(2)It is recommended to use a slotted holder or a split bushing for the mount
structure.（Recommended tightening torque in Example 1：4.0 to 5.0kgf･cm）
IMPORTANT
Absolutely avoid pressing the stem directly
with set screws. (The built-in bearing may
be damaged.)
Mount the gage so that the spindle is
directed perpendicular to the measured
surface. If the gage is mounted at an angle
to the measured surface, an error may be
generated in measurement results.
3.PrecautionsinProtectingtheGagefromDustandWater
IMPORTANT
The output connector plug (counter side) is not protectivestructured. Install
the gage at aplace where it is not splashed directly with water or oil.
If the cable covering is broken, liquid will penetrate into the gage inside
due to capillary phenomenon. This will cause damage to the gage.
Immediately repair the cable.
Be greatly careful not to damage the rubber boot due to chips, etc. If
the rubber boot is damaged, dust-proof and water-proof function will be
deteriorated. Immediately replace or repair the rubber boot.
The materials including rubber which are used for the rubber boot and
other sealing parts are not universal against diversified coolants and
chemicals. If those parts deteriorate unusually, consult the nearest
Mitutoyo Service Center.
Each part of the gage is sealed up, and therefore must not be
disassembled. If any part is disassembled, the rated performance will
not be obtained. Do not absolutely disassemble the gage.
4. Specifications of Gage Output Signals
１） Output connector：RM12BPE-6PH (Hirose)
２） Pin assignment
３） Output signal level
φＡ、φＡ、φＢ、φＢ（TTL line driver AM26LS31 or equivalent）
４） Input connector and recommended input circuit
Suitable connector：RM12BRD-6S (Hirose)
①Stem
②Rubber boot
③Spindle
④Contact point
⑤Signal cable
⑥Output connector
unit：mm
Ｍ９．５×０．５
３０
φ ８
０
－０．００９
８２．７
Thrust stem
mounting screw
Ring of discriminating
a model
Cable length ２ｍ
φ １２
１０．６ or more（stroke）
３１．９
⑤
RM12BPE-6PH
（Hirose）
①
②
③
⑥
④
１４
6.5
７３．１
１２５．５
cross section
cross section
②
①
①
Notch position
（９０°with respect to tap）
φ８
unit：ｍｍ
Ｍ４×０.７thru
・Example 2.
・Example 1.
Ｍ４×０.７thru
４.５drill, ７.５countersink,
４.４deep
１０
２０
７.５
＋０.０２０
＋０.００５
７.５
１５
６
６
１５
１５
１
１６
φ１０
７.５
１５
＋０.０２０
＋０.００５
②Split bushing
１
１５
φ８
＋０.０２０
＋０.００５
φ１０
０
－０.０１５
Error=Ｌ０-Ｌ１
θ
※
：Power supply to thegage head
Power voltage:5V(4.8V to 5.2V)
Ripple voltage:200mVp-p or less
Current consumption:120mA max.
Linear Gage LGK series
Ｎｏ．９９ＭＢＣ０８１Ｂ②
ＳｅｒｉｅｓＮｏ．５４２
Pin No.
Signal name
１
＋５Ｖ
２
φＡ
３
φＢ
４
φＡ
５
ＧＮＤ
６
φＢ
※
１
２
３
４
６
５
φＡ，φＢ
φＡ，φＢ
Recommended input circuit
ＬＧＫ output circuit
２６ＬＳ３２ or equivalent
３３ｐＦ
５１Ω
ＧＮＤ
＋５Ｖ
ＧＮＤ
＋５Ｖ

contact point
Rubber boot
(Ａ)
(Ａ)
KeyWay
Spindle
Stem
５） Output signal chart
This Linear gage outputs two patterns of waveform signal shown below.
Whendesigning an input circuit, error detection functionmust be prepared.
(1) Real-timepulseoutput(Whenthespindleis pushedin,φA precedesφB)
①Output condition : Spindle movement speed ≦Response speed※１
②Output signal’s minimum edge interval : Tr※２
③Output delay※３: Maximum 2.5μs
(2) Error output
①Output condition : In the conditions below, the gage turns to the error
status and outputs the special pattern shown in the
above.
Response speed※１ ＜Spindle movement speed
When suffering electric noise or physical shock.
②Output minimum pulse width : Te※２
※１）Response speed : See specifications.
※２）Minimum edge interval, pulse width : See specifications.
※３）Output delay : The time required for the output to catch up with
the spindle position.
６） Cable extendible length
The cable can be extended up to 20m using the extension cable
(optional).
IMPORTANT
Since error output can not be used as the counting data, the error
condition must be detected in the input circuit.
It is recommended to use a counter IC which can count 5Mcps
(1.25MHz in square wave signal) or higher.
If the gage cable is close to the power line for other instruments, the
gage may malfunction. Connect the gage cable as apart from the
power line as possible.
If the gage is connected with other counter than Mitutoyo made, allow
at least 0.2 second after the gage is turned on, then reset the counter.
5. Maintenance
１） Replacing the contact point
Fit the supplied key spanner in the keyway of the spindle, then detach
or attach the contact point by pinching it with, etc.
IMPORTANT
If torque is applied to the sensor
inside through the spindle, damage
or malfunction in the sensor may
result. Be sure to fix the spindle
using the key spanner.
２） Replacing the rubber boot
Preventive replacement before being damaged is recommendable.
(The rubber boot is available as an optional accessory.)
(1) Remove the old rubber boot, then eliminate the dust and dirt in the
grooves (part A) or the stem and spindle.
(2) Insert a rubber boot between the stem and contact point, directing
the greater inside diameter end to the stem.
(3) Apply a small amount of silicone adhesive to the grooves (part A),
and seal both ends of the rubber boot.
IMPORTANT
If the adhesive is applied to the spindle slider, the spindle will not slide
properly. Great care must be exercised.
6. Specifications
7. OptionalAccessories (must be purchased separately)
Example use of thrust stem
NOTE
To use the thrust stem, the above
three kinds of Optional accessories
(★-marked) are required.
If the thrust stem and tightening nut
are used, the gage mount fixture
needs only a φ9.5 hole to be drilled,
and also the gage can be mounted
firmly and easily.
IMPORTANT
Before mounting the thrust stem, be sure to secure the stem using the
dedicated spanner (No.02ADB683). Excessive force applied between
the gage body and stem may cause damage to the gage.
NOTE
The dedicated spanner (No.02ADB683) and M9.5 x 0.5 screw are used
only for mounting the thrust stem. Do not use them for other purposes.
phase Ａ
Ｔｒ（MIN）→１μｍ/０．５μｍ/０．１μｍ（Resolution）
Phase Ｂ
Ｔe（MIN）
phase Ａ
Phase Ｂ
Order No.
542-156
542-157
542-158
Model
LGK-110
LGK-0510
LGK-0110
Measuring range
10mm
Resolution
1μm
0.5μm
0.1μm
Color of ring of discriminating
a model
Green
Blue
Gold
Accuracy(at 20℃)
(1.5+L/50)μm※1
(0.8+L/50)μm
Quantizing error
±1count
Measuring force
Contact point downward
0.8N or less
Contact point horizontal
0.75N or less
Contact point upward
0.7N or less
Positional sensor
Photoelectric transmission linear encoder
Response speed
1500mm/s
1500mm/s
400mm/s
Output method
Signal type
90°phase differential square wave
(Compatible with RS422A)
Differentialsquarewavepitch
4μm
2μm
0.4μm
Minimum edge interval,
Minimum pulse width
Tr : 0.4μs
Te : 0.4μs
Tr : 0.2μs
Te : 0.2μs
Tr : 0.2μs
Te : 0.2μs
Contact point
φ3 carbide ball (Thread: M2.5 x 0.45)
Stem diameter
φ8
Bearing type
Stroke ball bearing
Protection level
IP66
Output cable length
2m (directly wired from the gage)
Operatingtemperature(Humidity)
0to40℃(20to80%RH,withnocondensation)
Storagetemperature(Humidity)
-10to60℃(20to80%RH,withnocondensation)
Standard accessory
Key spanner for contact point replacement
(No.538610)
CE marking
EMC Directive:EN61326-1
Immunity test requirements :Clause 6.2Table2
Emission limit :Class B
※1:L=Measured length in mm
Part name
Order No.
Extension cable(5m)
No.902434
Extension cable(10m)
No.902433
Extension cable(20m)
No.902432
Rubber boot
No.238772
Thrust stem ★
No.02ADB681
Tightening nut ★
No.02ADB682
Dedicated spanner ★
No.02ADB683
Fixture width
Ｌ:6 to 10.5mm
Thrust stem
Ｎｏ．０２ＡＤＢ６８１
Mounting nut
Ｎｏ．０２ＡＤＢ６８２
（３０.４）
１４.５
５
４
Ｌ
φ９.５
０
－０．０１５
Thrust stem and Mounting nut dimension
１２
１３.２５
(Standard accessory: 538610)
Key spanner
(for replacing contact points)
KeyWay
Mitutoyo Corporation
20-1, Sakado 1-Chome, Takatsu-ku,
Kawasaki-shi, Kanagawa 213-8533, Japan