ISO 3599 Vernier Caliper

8/19/2019 ISO 3599 Vernier Caliper

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INTERNATIONAL

TANDARD

rso

3599-1976

E)

Vernier

allipers

eading

o

0,1

and

0,0b

mm

1 SCOPE ND FIELD

OF APPLICATION

This lnternational

tandard pecif ies

he most important

dimensional, unctional

and

quality

characterist ics

f

vernier

call ipers eading

o

0,i and 0,05

mm, with

a

maximum range

of

1

000 mm. Methods or

testing

he

accuracyof the instrumentsare given in an annex. for

general

nformation

nly.

NOTE

-

These vernier

callipers

are also commonly known

as l/10

and l/20 vernier

call¡pers respectively-

2 NOMENCLATURE

ND DEFlNITIONS

2.1

For the nomenclature

or

vernier

all ipers.

ee

igures

1 a n d 2 .

2.2 e¡¡ot

of

measurement:.The

algebraic difference

between

he measured izeand he true size.

2.3 measuring

uncertainty

The

error

margin

corresponding

o the ¡nherent

rrors f

measurementf a

vernier

all iper.

t

¡sdefined

sbeing qual

o

f

2 s; .e. or

a normal

distr ibution

of the

readings

n

the instrument,

about95

% of readings

il l not deviaterom

the mean

ize

(true

value)

by more han

twice he standard

eviation

.

3 SPECIFICATION

3-l Design eatures

3.1.1 Measuring anges

For recommended

easuringanges,

ee able1.

3.1.2

Material

The main

parts

of the call iper hall

eof

good

quality

steel

(plain

arbon teel

r stainlessteel).

3.1.3

Beam

The beam

shallbe longenoughor

the sliding

aw

assembly

not

to overhang when

measuring

at

the

end of

the

measur¡ngange.

3,1.4

Jaws

For

the minimum

projection

f the

aws,

-¡n,

see able1.

The

maximum

projection,

-"",

shall e equal o

one-third

of the

measuringange

ut with

a maximum

f

200

mm.

The

sliding

aw

shallbe

a

good

sliding it

along he

beam n

order

o

permit

ine

adjustment

o

be made.

The

slider

hal lbe

provided

with

a suitable lamp

so hat t

may be effectively

clamped o the

beam

without altering

the

setting.

For

the

minimum

length

of the faces

f or internal

measurement

/-¡n),

see able

1.

The

jaws

may

be

provided

with knife

edges

as shown

in

figure

2.

The

nominal

combined

width

of the

jaws

for

internal

measurementhallbe 0*. 5, 10 or 20mm. The faces or

internal

measurement

except

he knife-edge

aces)

hall

be

of cylindricalorm

with a radius

ot exceeding

ne-half

f

their

combined

idth

(see

gure1).

3.1.5

Depth-measuring

evice

The vernier

call iper

may be

provided

with

a

depth-measuring

lade

which ¡s

connectedo

the slider

nd

allows

he measurement

f depthswith reference

o

the end

face

of the beam

see

igure

2} .

3.1,6

Sca/es

The beamshallbe graduatedn mill imetres nd he length

of the scale hall

e at

least

qual o

the measur¡ngange

f

the call iper

lus

he ength

f the vernier.

The ength

of th e vernier

calemaybe

9,

19

or 39

mm

(see

figures

,

5 and6).

The scale inesof

both the

beamand he vernier hall

be

sharp,

learand

perpendicular

o th e edge

f t he beam

nd

their

hicknesshal l

e

not lessthan

,08

mm

andnot more

than0,2

mm.

The numbering

n the beamand he vernier

hal l

be such

that

he scaleseasy

o

read.

'

For

aws

w¡th knife

edges.

767



:

tso 3599-1976

E)

The distancebetween

he

graduated

ace of the beam

and

the

edgeof the

graduated,

evelled

ace

of the

vernier hall

not exceed ,3 mm

(see

gure ).

4 ACCURACY

4.1

Measuringuncerta¡nty

The

permissible

easuring

ncerta¡nty

n micrometres

t

t

2

s. as

given

n table

2, is calculated

rom

the

following

formula

t

(50

+

0 ,1

¿)

where

L is any

measuredength,

n mil l imetres,

ithin the

measuring

ange.

4.2

Measuring

aces

With the

slider lamped

o

the beam t

any

pos¡tion

ith¡n

the

measuring

angeof

the calliper,

he

faces or external

measurement

hall

be

flat to w¡thin 10¡rm

per

100mm

over

heir ength.

heyshall e

parallel

o within

20l]m

per

100

mm over

heir ength.

The

faces or internal

measurement

hall

be

parallel

o

w¡thin

10

gm

over their

length, and

the

permissible

tolerance

or their combined width

{see

3.1.4)

shall

b e : * 3 0 ¡ l m

0

The

measuring

aces hallhave

diamond

yramid

ardness

number

f not lesshan

-

700

HV

for

plain

carbon

teel;

-

550

HV

for

stainless

teel.

4,3 Scale

ines

In

any

one nstrument,

he

h¡ckness

f a ll scale

ines n the

main

scale and

verniershall

not differ by

more

than

0.03mm.

5

TABLES

5.1

Dimensionsf

vernier

all ipers

TABLE 1

5.2

Measuringuncertainty

Dimensions

in mill¡metres

External

measllringEngs

Minimum

pro¡ection

of

jaws

Jmin

M¡n¡mum ongrth

of

facss

o¡

interna

measuromenl

/m¡n

O o 135

0 to

160

O

o

200

O o 250

Oto 300

0 ro 500

0

ro

750

Oto 1

O0O

35

40

50

50

60

80

80

10 0

o

o

8

10 .

1 0

1 5

1 5

20

TABLE 2

Measuredsngth

L

Measur¡ng

ncorla¡nty

a r i 2 s ( 9 5 % )

mm

,/m

0

1 00

200

300

400

500

600

700

800

900

1 000

r 5 O

t 6 O

i 7 0

É 8 0

+ 9 O

i

1 00

i

1 1 0

120

1 30

i

140

É 1 5 0

768



Vernier scale

rso

3599-1976

E)

Fine

ad jus tment

c lamp

F¡ne adjustment screw

Fine ad ius tment nu t

Combined

width

for ¡nternal measurement

S l¡d ¡ng

aw

F I G U R E

0 5 1 0

FIGURE

5

-0,1

vernie¡

of

langrth

19 mm

NOTE

-

The

illustrations

are d¡agrammat¡c

only and are

no t

9 l 0 f l 1 2 1 3 l ¡ 1 5 1 6 1 t t l

,1,, , ,1,, , ,1ur,1,, , ,1,, ,¡1,, , ,1,, , ,1,, , ,1,, , ,1,, , ,1,, , ,1 '

Knife-edge

faces or ¡nternal measulement

F I G U R E

9 t 0 i l t 2 1 3

,1,,,'1,,,,1,,,,1,,,,1,,,,1,,,,1,,,,1',,'1,,,,1,,,,1,,,,1,,,,1,,

E

E

CÐ

X

E

3,

(r Scale

,

,

r

l , ' , ' , ¡ , , , 1 , r ,

,

I |

|

'

r

'

1 "

"

|

" ' f ì - \

O

I ¡ O

I

lO

\Vernierscale

FIGURE

4

-

0,1

vernier of

length

9

mm

FIGURE

6

-0,05

vernier

of

longrth

39

mm

¡ntended to

show details of des¡gn.

769



__

1

j

I

4

rso

3599-1976

E)

A N N E X

METHODSOF TEST

4.1 MEASURING

UNCERTAINTY

The

inherent rrorsof measurementf a vernier all ipermay be checkedwith

gauge

lock combinationsf

known

size.

chosen o cover

a numberof

points

both over range f the instrumentand hat of the vernier.

The measuring

aces

f the

gauge

locks hall e

placed

etweenhe

aws,

nd he outsidemeasuringaces f the call iper hall

bechecked

t

three

points.

4.2 MEASURING

FACES

4.2.1 Flatness

The flatness

f the

faces

or external

measurement ay be

checked

by applyinga

"knife

edge"

straightedge,

r by another

appropriatemethod.

4.2.2

Parallelism

The

parallelism

f the faces or e xternalmeasurement

ay

be

checkedby inserting

auge

blocksbetween

hem

at d¡fferent

points

of the

aws

and at different measured

engths y

varying

he sizes f the

gauge

locks.

The

parallelism

f the

faces or

externalmeasurement hall not be affected

by clamping he slider.This may be checked y

leaving narrow

gap

betweenhe measuringaces

ndobservinghis

gap

whenclampinghe

slider.

The

parallelism

f the

faces

or internal

measurement ay be checked y

means

f

a micrometer. o

ensure

hat the

radius

s

not too large,he combined

aws

maybe checked ith a

plain

ing

gauge

f 5 , 10 or 20 mm diameter. sapplicable.

4.2.3 Scale ines

The thickness

f the scale ines may be checked

by

direct measurement

ith a microscopeitted with

a micrometric

evice.

770

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ISO 3599 Vernier Caliper