OUTSIDE MICROMETERS - Knowledge Sharing Centre€¦ · OUTSIDE MICROMETERS Education Pack Mitutoyo Belgium · Hogenakkerhoekstraat 8 · 9150 Kruibeke · Belgique · Tél. + 32 (0)

OUTSIDE MICROMETERSEducation Pack

Mitutoyo Belgium · Hogenakkerhoekstraat 8 · 9150 Kruibeke · Belgique · Tél. + 32 (0) 3 254 04 44 · Fax : + 32 (0) 3 254 04 45 · [email protected] · www.mitutoyo.be Mitutoyo Nederland BV · Wiltonstraat 25 · 3905 KW Veenendaal · Nederland · Tel. +31 (0)318-534911 · [email protected] · www.mitutoyo.nl © MITUTOYO / BE 0815 PRE9004_2 (2)

Application

DefinitionMicrometer for external measurements (EN ISO 3611)"Measuring instrument which gives the evaluation of a dimensional quantity of an external feature of a workpiece on the basis of movement of a spindle with a measuring face, moving relatively to a material measure and an anvil, with the movement generated by a screw thread."(1)

One hand operation with QuantuMike, a ratched thimble micrometer. This is a micrometer with a 2 mm spindle pitch, offering movement four times as fast as a standard micrometer with 0.5 mm spindle pitch.

Application IP65 micrometer in a machine tool.

Application in a micrometer stand. Keeps both hands free for operating the micrometer and positioning the workpiece.

StandardEN ISO 3611Geometrical product specifications (GPS) – dimensional measuring equipment: Micrometers for external measurements – design and metrological characteristics

How to Read an Analog MicrometerMicrometer with standard scale (graduation: 0.01 mm)

The thimble scale can be read directly to 0.01 mm, as shown above, but may also be estimated to 0.001 mm when the lines are nearly coincident because the line thickness is 1/5 of the spacing between them.

®

Measuring facesAnvil

Frame

Spindle

Sleeve

Fiducial line

Fast drive with ratched

ThimbleThimble scale

Sleeve scale

Spindle clamp

Thermally insulating plate

Measuring facesAnvil

Frame

Spindle Spindle clampSleeve Thimble

Ratchet

DIGIMATIC output connector

ZERO (Incremental mode) / ABS (Absolute mode) setting button

Display reading HOLD button

Thermally insulating plate

Origin button (ABS-Zero)

0 545

40

35

30

(1)

(2)

(1) Sleeve scale reading 7.00 mm(2) Thimble scale reading 0.37 mm

Micrometer reading 7.37 mm

Note: 0.37 mm (2) is read from the thimble scale where it intersects the fiducial line.

Fiducial line Fiducial lineThimble line Thimble line

Approx. +1 μm Approx. +2 μm

Type One-handed operation Remarks

Ratchet stopUnsuitable Audible clicking operation causes micro-shocks

Ratchet thimbleSuitable

Audible operation providesconfirmation of constant measuring force

(c) From below thefiducial line

(b) Looking directly atthe fiducial line

(a) From above thefiducial line

(c)

(b)

(a)

Sleeve

Thimble

Look directly at the fiducial line when taking a reading against the thimble graduations. If the graduations are viewed from an angle, the reading will be incorrect due to parallax error.

High accuracy micrometer Enabeling 0.1 μm resolution measurement. This microme-ter is ideal for applications like highly accurate measure-ments with a handheld tool.

Zero setting of analog micrometer If the error is ≤ ±0.01 mm. Clamp the spindle and use the key spanner to turn the sleeve with the fiducial line to zero position of the thimble.

IP65 level Is recommended for shopfloor environment. It has ex-cellent resistance against water and dust enabeling the micrometer to use in machining situations that include splashing coolant fluid.

Fast drive with ratchet stop Ratched thimble

To promote consistent and accurate measurement, it is recommended that the ratchet mechanism is used (if fitted) so that the measuring force is held constant. Operating the ratchet three times between finger and thumb is sufficient.

Type Picture Application Remarks

Point micrometerExtremely high surface pressure

3-8 N measuring forceCarbide or hardened steel tip

Spline micrometerHigh surface pressure

5-10 N measuring force

Blade micrometerHigh surface pressure

5-10 N measuring forceNon-rotating spindle

Dedicated Micrometers (Sample Assortment)

Calibration For micrometers gauge blocks or gauge block combinations should be selected. Refer to EN ISO 3611, the following gauge blocks are suitiable for micrometer thread pitches of 0.5 mm and 1 mm.

Block allocation2.5 mm 15 mm5.1 mm 17.6 mm7.7 mm 20.2 mm

10.3 mm 22.8 mm12.9 mm 25 mm

(1) EN ISO 3611 (2010)

Parallax Error

Measuring Force Control

DIGITAL AND DIAL INDICATORSEducation Pack


DefinitionElectronic digital-indicator gauge (EN ISO 13102)"Measuring instrument in which the axial displacements of a plunger are obtained by a transducer and converted into an electronic signal by suitable electronic means and transmitted to a physically integrated digital display."(1)

Mechanical dial gauge (dial indicator) (EN ISO 463)"Measuring instrument in which the axial displacements of a plunger are transmitted and magnified by suitable mechanical means to a pointer which rotates in front of an analogue circular scale.It may also be provided with a revolution-counting de-vice, e.g. in which a pointer rotates in front of a scale which indicates the number of revolutions of the pointer or the axial displacement of the plunger."(2)

Application

Multifunction digital indicator in a gauge stand

Dial

Limit indicatorScale graduation

Bezel

Revolution counting device

Pointer

Scale

Contact element

Plunger (or spindle)

Stem

Bezelclamp

Measuring face

DIGIMATIC output connector

Contact element

Plunger (or spindle)

Stem

Measuring face

Display

Data output or hold button/ on-off button

Protection cap

StandardEN ISO 13102Geometrical product specifications (GPS) – dimensional measuring equipment: Electronic digital indicator – design and metrological characteristics.

EN ISO 463Geometrical product specifications (GPS) – dimensional measuring equipment: Dial gauges – design and metrological characteristics.

Mounting an IndicatorMounting method Example

Clamping the stem directly with a screw

Clamping the stemby split-clamp fastening

Lug mounting

8 mm or more

M6 screw

Plain washer

Instructions of Application

Correct mounting: To maintain a minimum measuring circuit (prevent applied forces), the dial indicator should be clamped as close as possible to the stand column.

Should the workpiece be approx. 1 mm larger than nominal dimensi-on, the part is assessed as good if the smaller pointer is ignored.

Fault-free identification of rejects. If the workpiece is appr. 1 mm lar-ger or smaller the pointer goes to the red area of the dial.

One Revolution Dial Indicator

Spindle lifting lever Spindle lifting knop

Spindle Lifting Function

Spindle lifting cable

Dial indicator with bore gauge measuring inside diameter

ABS preset (ABS-Zero)/ Zero (incremental mode)

Parameter setting e.g. counting direction,

tolerance function

Tolerance Judgment

Spindle lifting handle

Calibration It is recommended to use an gauge calibration equipment (I-Checker) with software sup-port. The calibration should evaluate the performance of the indicators within the measuring range using both directions of displacement of the plunger.

Bi-directional (multi-revolution) Balanced (multi-revolution) Balanced (one revolution)

Different DialsScale graduation: 0.01 mm

Scale graduation: 0.001 mm

Standard scale spacing Double scale spacing Balanced (multi-revolution)

Measurement value and tolerance judgment

Enlarged display of the tolerance judgment

NG Okay

(1) EN ISO 13102 (2012) (2) EN ISO 463 (2006)

-NG

-NG

Go

Go

+NG

+NG

Tolerance judgment with pointer and limit indicators

Go +NG

Tolerance judgment ± NG / GO red / green LCD backlight

+NGGo

GAUGE BLOCKSEducation Pack


Application

Advantages of Ceramic Gauge Blocks1. Corrosion restistantAnti-corrosion treatment is not required when handled normally (i.e.with fingers), resulting in simple maintenance and storage.2. No burrs caused by dents, ect.Since the CERA Blocks is very hard, it will not scratch and is highlyresistant to burrs. If a burr is formed, it can easily be removed with aceramic deburring stone (Ceraston).3. Abrasion resistantCERA Blocks have 10 times the abrasion resistance of steel gauge blocks.

Perfect Wringing of Gauge Blocks

DefinitionGauge blocks are used for setting and calibrating measuring instruments and are the most important means for connection to the length unit meter at company level. They embody a certain length with a high degree of accuracy – hence the term material measure.

50

mm

xxxx

xx

1.8

xxxxxx

StandardEN ISO 3650Geometrical product specifications (GPS) - length standards - gauge blocks

CERA Block

20000

0.2

0.4

4000 6000 8000

Wear Resistance of Different Materials

4. Dimensionally stableCERA Blocks are free from dimensional change over time.5. Sizes clearly markedBlack characters, indicating the nominal length, are inscribed by laser and are clearly visible against the white surface of the block. 6. Non-magnetic nature prevents steel swarf contamination7. High wringing forceSuperior flatness and surface finish provides maximum wringing force.8. Closest expansions coefficient to steelThe thermal expansions coefficient of a CERA Block is quite similar tothat of a steel gauge block.

3

CERA Block

2

1

19

20 21 22 23

1817

-1

-2

-3

Temperature Characteristics of Different Materials

9. Highly resistant to dropping and impactThe CERA Block material is one of the toughest ceramics. It is extremlydifficult to crack a CERA block in normal use.

Based on 1 mm steps

1st pick 1.0062nd pick 1.323rd pick 1.54th pick 25th pick 20

506th pick 30Total 55.826

Completed gauge block

stack 55.826 mm

Grade and ApplicationThe grades specify the metrological characteristics (grades of accuracy). The following table can be used to select the gauge block grade according to usage (specified by EN ISO 3650, BS4311, and JIS B 7506).

Applications GradeWorkshop use • Mounting tools and cutters 2

• Manufacturing gages• Calibrating instruments

1 or 2

Inspection use • Setup of measuring devices 1 or 2• Checking the accuracy of gages• Calibrating instruments

0 or 1

Calibration use • Checking the accuracy of gauge blocks for workshop• Checking the accuracy of gauge blocks for inspection• Checking the accuracy of instruments

K or 0

Reference use • Checking the accuracy of gauge blocks for calibration• For academic research

K

MaterialProperty

CERA Block(ZrO2)

Steel (Fe)

Carbide (WC-Co)

Hardness (HV) 1350 800 1650

Building up a StackWhen building up a stack (e.g. 55.826 mm) don’t pick the big blocks first by working on the first digit. That way is harder and you may run out of combinations.Work from right to left by obtaining the last digit first. The last digit in this case is 6, so pick 1.006 mm. Work through the rest of the dimension by picking the largest blocks that fit the next digit(s), as shown.

CertificatesILACThe International Laboratory Accreditation Cooperation is an international cooperation of laboratory and inspection accreditation bodies. The member bodies signed the ILAC Mutual Recognition Arrangement (MRA) which guaran-tees a cross approval of certificates from accredited laboratories from other countries. Signatories to the ILAC arrangement are almost all European countries.

JCSSMitutoyo gauge block sets can be delivered with a JCSS certificate of calibration (Japan Calibration Service System). A JCSS certificate of calibration is comparable with e.g. DAkkS, COFRAC, RvA or UKAS certificate of calibration. According to ILAC, this calibration result may be accepted internationally.

Checking the accuracy of measuring tools

nom

inal

lengt

hno

min

al len

gth

Setup of measuring devices

Measuring faces

Calibrating measuring instruments

• Wringing should always be performed in a clean placeon a soft pad - if gauge blocks slip from your hand,they will not be damaged.

• Wipe off the oil film from the gauge blocks using a softcloth and petroleum ether.

• After this “rough” cleaning the surfaces are cleanedwith a cosmetic brush rinsed with petroleum etherand then “blown free” with an air blower.

• Never use alcohol or common benzine for cleaning;common benzine contains too many impurities andalcohol always has aqueous components which maycause corrosion.

• Best-suited for wiping gauge blocks are microfibercloths.

• Check the cleaned gauge blocks for rust and scratches.• If there are any burrs on the measuring surface remove

them carefully using a special ceraston for gaugeblocks. Move the dry gauge block over the cerastonexerting very low pressure.

• In case the measuring surfaces are in good condition,but wringing is still difficult, you may wipe them withmedical cotton wool - its oily components willprovide a fine film thus improving the grip of themeasuring surfaces.

Wringing Two Thick Gauge Blocks

Bring the two measuring faces into contact with each other at right angles.

While applying a small amount of force, gently turn one gauge block on the other. You will feel the two blocks stick together.

air blowerpetroleum

ether

cosmetic brush

cotton wool

microfiber cloth

ceraston

Step 2

Step 1

Step 3 Slide one gauge block over the other so that the sides of the blocks are flush with each other.

MaterialProperty

CERA Block(ZrO2)

Steel (Fe)

Carbide (WC-Co)

Coefficient of thermal expansion (10-6/K)

9.3 ± 0.5 10.8 ± 0.5 5.5 ± 1.0

This is a clear advantage: The gauge blocks should have a coefficient close to that of the measuring instrument itself. Otherwise there would be an error due to different amounts of thermal expansions, e.g. under workshop conditions.

Difference in dimension (μm)

Temperature (C)

Differences in the dimension between some materials and steel that are obtained when measuring testpieces witha length of 100 mm at each temperature.

Tungsten carbide

Tungsten carbide

SteelAbrasion loss

(μm)

Amount of travel (m)

Documents

OUTSIDE MICROMETERS - Knowledge Sharing Centre€¦ · OUTSIDE MICROMETERS Education Pack Mitutoyo Belgium · Hogenakkerhoekstraat 8 · 9150 Kruibeke · Belgique · Tél. + 32 (0)