ISO 3599 Vernier Caliper
Transcript of 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
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:
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
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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
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__
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