Linear Gage LGK series

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.

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）

Ｍ４×０.７ thru

７.５

１６

１

Ｎｏ．９９ＭＢＣ０８１Ｂ②

ＳｅｒｉｅｓＮｏ．５４２

１５

７.５ unit：ｍｍ

Safety Precautions

To ensure operator safety, use the instrument in conformance with the directions and specifications given in this User’s Manual.

・Example 1.

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

Cable length ２ｍ

⑤

φ １２

Ring of discriminating

a model

Thrust stem mounting screw

Ｍ９．５×０．５

①

０

－０．００９

３０

②

③

RM12BPE-6PH

（Hirose）

⑥

④ unit：mm

① Stem

② Rubber boot

③ Spindle

④ Contact point

⑤ Signal cable

⑥ Output connector

・Example 2.

②

①

φ ８

＋０.０２０

＋０.００５

①

φ １０

＋０.０２０

＋０.００５ cross section

２０

１０

４.５ drill, ７.５ countersink,

４.４ deep

１５

７.５

Ｍ４×０.７ thru

②Split bushing

φ １０

０

－０.０１５

φ ８

＋０.０２０

＋０.００５

θ

１

Notch position

（９０°with respect to tap） cross section

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

Error=Ｌ０-Ｌ１ generated in measurement results.

3. Precautions in Protecting the Gage from Dust and Water

IMPORTANT

 The output connector plug (counter side) is not protective structured. Install the gage at a place 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

１ Pin No. Signal name

２

５

１ ＋５Ｖ ※ ※ ：Power supply to the gage head

３

６

２

３

４

５

φＡ

φＢ

φＡ

ＧＮＤ

Power voltage:5V(4.8V to 5.2V)

Ripple voltage:200mVp-p or less

Current consumption:120mA max.

４

６ φＢ

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)

ＬＧＫ output circuit Recommended input circuit

φ Ａ，φ Ｂ

３３ｐＦ

φ Ａ，φ Ｂ ５１ Ω

＋５Ｖ ＋５Ｖ

２６ＬＳ３２ or equivalent

ＧＮＤ ＧＮＤ

５） Output signal chart

This Linear gage outputs two patterns of waveform signal shown below.

When designing an input circuit, error detection function must be prepared.

(1) Real-time pulse output (When the spindle is pushed in,φA precedes φB) phase Ａ

Phase Ｂ

Ｔｒ（MIN） → １ μ ｍ/０．５μ ｍ/０．１μ ｍ（Resolution）

① Output condition : Spindle movement speed ≦ Response speed ※１

Output signal’s minimum edge interval : Tr ※２

③ Output delay ※３

: Maximum 2.5

μs

(2) Error output phase Ａ

Phase Ｂ

Ｔ e（MIN）

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

※２

）Response speed : See specifications.

※３

）Minimum edge interval, pulse width : See specifications.

）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

KeyWay using the key spanner.

Key spanner

(for replacing contact points)

(Standard accessory: 538610) 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.

Stem ( Ａ ) ( Ａ )

Spindle KeyWay Rubber boot contact point

(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

Order No.

Model

542-156

LGK-110

542-157 542-158

LGK-0510 LGK-0110

Measuring range

Resolution

Color of ring of discriminating a model

10mm

1 μm

Green

0.5

μm

Blue

0.1

μm

Gold

Accuracy(at 20℃)

Quantizing error

(1.5+L/50)

μm ※1

±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

Response speed

(0.8+L/50)

μm

Photoelectric transmission linear encoder

1500mm/s 1500mm/s 400mm/s

Output method

Signal type 90°phase differential square wave

(Compatible with RS422A)

Differential square wave pitch 4

μm

2

μm

0.4

μm

Minimum edge interval,

Minimum pulse width

Contact point

Tr : 0.4

μs

Te : 0.4

μs

Tr : 0.2

μs

Te : 0.2

μs

Tr : 0.2

μs

Te : 0.2

μs

φ3 carbide ball (Thread: M2.5 x 0.45)

Stem diameter

Bearing type

φ8

Stroke ball bearing

Protection level

Output cable length

Standard accessory

CE marking

IP66

2m (directly wired from the gage)

Operating temperature(Humidity) 0 to 40℃ (20 to 80%RH, with no condensation)

Storage temperature(Humidity) -10 to 60℃ (20 to 80%RH, with no condensation)

Key spanner for contact point replacement

(No.538610)

EMC Directive:EN61326-1

Immunity test requirements :Clause 6.2 Table2

Emission limit :Class B

※1:L=Measured length in mm

7. Optional Accessories (must be purchased separately)

P a r t n a m e O r d e r N o .

Extension cable(5m) No.902434

Extension cable(10m) No.902433

Rubber boot

Thrust stem

★

Tightening nut

★

Dedicated spanner

★

 Example use of thrust stem

NOTE

Extension cable(20m)

To use the thrust stem, the above three kinds of Optional accessories

(

★

-marked) are required.

No.902432

No.238772

No.02ADB681

No.02ADB682

No.02ADB683

Thrust stem

Ｎｏ．０２ＡＤＢ６８１

φ ９.５

０

－０．０１５

Mounting nut

Ｎｏ．０２ＡＤＢ６８２

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

Fixture width

Ｌ:6 to 10.5mm

Thrust stem and Mounting nut dimension

１３.２５ 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.

Mitutoyo Corporation

20-1, Sakado 1-Chome, Takatsu-ku,

Kawasaki-shi, Kanagawa 213-8533, Japan