IS 2949: Engineering metrology - Plain V-blocks for inspection purposes

16 Pages·1992·1.4 MB·English

by  Bureau of Indian Standards

इंटरनेट मानक
Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a practical regime of right to
information for citizens to secure access to information under the control of public authorities,
in order to promote transparency and accountability in the working of every public authority,
and whereas the attached publication of the Bureau of Indian Standards is of particular interest
to the public, particularly disadvantaged communities and those engaged in the pursuit of
education and knowledge, the attached public safety standard is made available to promote the
timely dissemination of this information in an accurate manner to the public.
“जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ”
Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru
“The Right to Information, The Right to Live” “Step Out From the Old to the New”
IS 2949 (1992): Engineering metrology - Plain V-blocks for
inspection purposes [PGD 25: Engineering Metrology]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”

SI 9492 : 1992
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?VT %mp - fs!rf+
( TTF w*r;5‘ )
Indian Standard
ENGINEERINGMETROLOGY-
PLAINV-BLOCKSFORINSPECTION
PURPOSES- SPECIFICATION
( Second Revision )
~~~
tsriF tnirpeR TSUGUA 1997
UDC 15’117’135

@ SIB 1992
BUREAU OF INDIAN STANDARDS
KANAM ,NAVAHB 9 RUDAHAB HAHS RAFAZ MARG
WEN IHLED 110002

February 1992 Price Group 5
gnireenignE ygolorteM lanoitceS ,eettimmoC ML 05
FOREWORD
sihT‘ nzidrJ dradnatS ( droceS noisiveR > was detpcda yb the uaeruB fo naidnI Standards, retfa
the tfard dezilanif yb eht gnireenignE ygolorteM lanoitceS eettimmoC had neeb devorppa yb eht
thgiL lacinahceM gnireenignE noisiviD .licnuoC
sihT standard was yllanigiro dehsilbup ni 1964 dra its tsrif noisiver was thguorb tuo ni 1974.
The eettimmcc elbisnopser rof noitacilbup fo this standard dediced ot ekat up dnoces noisiver
fo this standard ot edulcni elbuod skcclb-V and ot align ti htiw NID 2274 : 1981 skcolb-V‘ rof
noitcensni ,sesourun Dnised ,’stnemeriuaer issued vb sehcstueD Jnstitut riif gnumroN ( ynamreG .)
rojamihf sthgilhgih fo this noisiver :era .
a) NID 2274 : 1981 sevig sliated fo skcolb-V rof noitcepsni sesoprup .ylno sihT standard is
thus tnaem rof skcolb-V rof ri noitceps sesoprup .ylno
b) ehT lanigiro standard dedulcni owt sedarg desab no lairetam .noitacificeps edarG B
dedulcni ni reilrae standard deificeps tsac nori skcolb-V hcihw era ton desu rof noitcepsni
sesoprup atd ecneh yeht era deteled ni this .noitide esehT yam eb derevoc yb etarapes
standard.
lc owT selgna fo ,eeV that is 0OS and lC8” era nevig ni this standard. nI noitidda ot eeV elgna
fo 90” hcihw is llit won tsomla ylevisulcxe ,desu 108” is osla deificeps ecnis 108” is -irtemoeg
yllac suoegatnavda ot .esu roF ssendnuor stset 108” is lufesu rof tsomla all mrof snoitaived
and all yllacitcarp gnirrucco mrofinu evaw rorre nac eb deifitnedi ( gnitpecxe 9 dedis mrofinu
evaw rorre .) suhT a laiceps ecnacifingis is dehcatta ot eht eeV elgna 108” rof gnitset
sselertnec dnuorg .stnenopmoc
)d eerhT sedarg fo skcolb-V era ,deificeps desab no .seicarucca
)e ecniS eht standard is tnaem ylno rof skcolb-V rof noitcepsni ,sesoprup sliated fo spmalc era
nevig ni xennA A.
)f elbuoD level elgris evoorg skcolb-V era .dedulcni
g) secnareloT rof suoirav sretemarap evah neeb deificeps as rep NID q/22 : 1981.
)h ehT noitanimreted fo segnar rof eceipkrow retemaid dca fo eht ngised noisnemid is enod
rednu noitisoppuserp that a yrotcafsitas laitnegnat gnitaes fo eht eceipkrow ni kcolb-V is

assumed taking otni noitaredisnoc yra egde .gnipols ehT egde epols egrar and eht evoorg

noisnemid erew denimreted ylralucitrap rof eht ycarucca edarG 0 htiw tcepser ot mumixam
elbissop eceipkrow retemaid .egcar
gnitset ,skcclb-V ynam cisat selpicrirp and sdohtem era elbissop os that ylno eno
j) Fcr
dchtem tonnac eb deficcps rof ra y .retemarap ylnO eno dohtem is nevig ni xennA B and
is detcirtser ot larereg stnemetats and enc elpmaxe .ylro tI is ton eht ylno deificeps dohtem
rof gniyfirev an etairporppa .retemarap yraM stnenopmoc era dedulcni ni eht -erusaem
.strem ,revewoH rof gnitaulave sesoprup ti nac eb detats that tnaveler ecnarelot lliw ton
eb dedeecxe fi yna noitcerid is detset gridrocca ot this elpmaxe and is devresbo less than ro
lauqe ot deificeps .ecnarelot
. -
IS 2949 : 1992
Indian Standard
ENGINEERING METROLOGY -
PLAIN V-BLOCKS FOR INSPECTION
PURPOSES - SPECIFICATION
( Second Revision )
1 EPOCS SI .oN Title
1501 sdohteM rof srekciV -drah
1.1 sihT standard srevoc eht stnemeriuqer fo ( traP 1 ) : 1984 ness tset rof cillatem
skcolb-V ot eb desu as laudividni skcolb-V ro ni slairetam : traP 1 VH 5 ot
pairs rof noitcepsni .sesoprup ehT standard VH 100 ( dnoces revision )
osla sevig ?ht snoisnemid fo spmalc ot eb desu
7018 lacinhceT ylppus snoitidnoc
htiw .skcolb-V
( traP 1 ) : 1983 rof seguag : traP 1 lareneG
1.2 esU fo skcolB-V 8000 lacirtemoeG gnicnarelot no
( traP 1 ) : 1985 lacinhcet drawings : traP 1
secnareloT fo mrof -neiro
skcolb-V rof noitcepsni esoprup era ylbareferp
,noitat noitacol and tuo-nur
desu rof ,gningila gnikram and gnitset fo
and etairporppa lacirtemoeg
lacirdnilyc and depahs-V .seceipkrow
snoitinifed ( first revision )
2 SECNEREFER 3 ERUTALCNEMdN AND SNOITINIFED
3.1 ehT erutalcnemon detartsulli ni .giF 1,
ehT gniwollof naidnI Standards era yrassecen gnola htiw snoitinifed nevig ni 3.1 ot 3.7 shall
stcnujda ot this standard: .ylppa
SKNALF OF EEV SKNALF OF EEV

SINGLE VEE. SINGLE VEE
SINGLE GROOVE V-BLOCK DOUBLE GROOVE V -BLOCK
C3L’BLE VEE SlttrJLE C_QOOVE V-BLOCK
IS 2949:1992
3.2 Matched Pair 4 DESIGN AND TYPE OF V-BLOCK
Two ’skcolb-V fo eht emas lanimon ezis and emas 4.1 Design
edarg fo .ycarucca
4.1.1 tnereffiD designs as nevig woleb era
:elbissop
3.3 Working Sorfaces
Flanks fo ,seeV ,esab dne ,secaf pot secaf and )a With 1 eeV ro 2 seeV gnicaf eno ,rehtona
edis secaf fo .kcolb-V
)b elgna-V fo 90” ro ,”SOI and
3.4 Geometrical Tolerances )c With ro tuohtiw edis and tnorf secaf as
tcatnoc .secafrus
snoitirr8c shall eb as rep SI 8000 ( traP 1 ) :
4.2 Type of V-Block
3.5 Matching Tolerance skcolb-V yam evah elgnis ro elbuod eeV and
elbacilppA ot dehctam skcolb-V .ylno tI is eht elgnis ro elbuod sevoorg as rep .giF 1.
ecnereffid ni thgieh evoba eht esab fo eht
4.2.1 epyT Al htiw elgnis eeV and edis and dne
skcolb-V ot eht pot srednilyc gnitcatnoc raen eht
secaf as tcatnoc .secafrus
mottob dca raen eht pot fo eeV secafrus -ser
ylevitcep fo owt dehctam skcolb-V ( ees .giF 2 .) 4.2.2 epyT A2 htiw owt seeV and edis and dne
secaf as tcatnoc .secdfrus
3.6 Minimum and Maximum Size of Work-
4.2.3 epyT lB htiw elgnis eeV and edis and dne
pieces
secaf ton dednetni as tcatnoc .secafrus
The muminim and mumixam sretemaid fo
lacirdnilyc w eceipkro that nac eb -ommocca 4.2.4 epyT 2B htiw owt seeV and edis and dne
detad no eht kcolb-V ( ees .giF 2 .) secaf ton dednetni as tcatnoc .secafrus
3.7 Axis of V-Block roF designs fo kcolb-V fo epyT lB and ,2B
the
ehT enil fo noitcesretni fo eht senalp fo sknalf edis and tnorf secaf era ton dednetni as tcatnoc
fo .eeV .secafrus
MUMINIM AID FO
ECEIPKROW
\

GNIHCTAM :ECNARELOT ECNEREFFID NI ,Z AND 2Z
MUMIXAM PID FO
ECEIPKROW\
GNIHCTAM ECNARELOT = ECNEREFFID NI ,Z AND ZL
2
FIG. MATCHING TOLERANCEO F MATCHED V-BLOCKS

2
IS 2949 : 1992
5 GRADES OF V-BLOCKS in IS 7018 traP( 1 ) : 1983.
skcolB-V shall eb fo eerht ,sedarg ,yleman 6.2 ssendraH
edarG 0, 1 and 2.
skcolb-V shall eb denedrah ot hardness eulav fo
6 MATERIAL AND HARDNESS 650 f 100 VH [ ees SI 1501 ( traP 1 ) : 1984 1.
6.1 skcolb-V shall zb edam morf elbatius ytilauq 7 DIMENSIONS
fo leets detceles morf eht sedarg fo sleets nevig snoisnemiD shall eb as nevig ni selbaT 1 ot 4.
Table 1 Dimensions of Type Al and Bl V-Blocks, V-Angle cx = 90”
( Clauses 7 and 2.11 )
llA snoisnemid ni .sertemillim
a
END
ECAF = = _-z-z-z--.Z---_-x-l-=
_----- __--_-zz===-
-

htdiw‘ htg;eL Height Groove Dimensions Diameter of Workpiece
1 r--hh _-Y h c-_6-,_ --1 11, r--- ro-F----- edarG 0 h--_ roF-_-_- sedarG-~ 1 dna 2
~___h--_C _---__c
Min Max
Min Max Min Max
40 50 40 25.292 1.2 24 2.6 41.0 4 40
40 75 40 24.726 1’5 24 3.5 42.0 6 40
40 100 40 24.726 2.2 24 4.4 42.2 7 40
50 150 45 26.191 2.9 25 5.4 52.1 8 50
70 200 55 28,483 3.1 27 6.7 73.0 10 70
85 250 65 33.180 3.8 32 7.7 88.0 11 85
100 300 75 37,877 4.5 36 8.7 ‘02.9 12 100
NOTES
1 ehT tsellams retemaid fo eceipkrow rof hcihw a kcolb-V yam eb desu si deniatbo morf eht evoorg htdiw
‘6%’ gnikat otni noitaredisnoc eht ecnatsid ’s‘ gnidrocca ot 8.3 dna eht ecnarelot fo yrtemmys ,t fo eht
.evoorg
2 ehT erugil si evitacidni fo snoisnemid ylno dna seod ton yficeps ngised .serutaef
1) ,h si eht laciteroeht noisnemid rof eht thgieh fo eht senil fo noitcesretni fo eht gnitnuom secafrus gnikat otnI
noitaredisnoc eht mumixam eceipkrow ,retemaid eht lanoitcurtsnoc noisnemid dna eht ecnatsid .’s‘ roF h,,
ereht si on ,ecnarelot tpecxe taht ti llahs eb derusne taht hs is retaerg naht h,.
3
IS 9492 : 2991
"801
Table 2 Dimcosions of Types Al and Bl V-Blocks, V-Angle o =
( sesualC
7 and 11.2)
llA snoisnemid ni .sertemillim
htgneL thgieH evoorG snoisnemiD retemaiD fo eceipkroW ’
I ~-_-_h____r _____._h__--.---r _
7-*---‘ ab h roF edarG 0 roF sedarG 1 ?-dna
M/n h3 h4u.x r__h_--, t--- h___>
hIin Max hfifl MCIX
30 30 30 12.124 0.9 22 2.1 31.3 4.5 30
40 50 40 30.989 1.2 30 3.3 41.3 5 40
40 75 40 30’519 1.7 30 4.7 0.34 8 04

04 0Cl 04 915’03 3’2 03 7.5 0.34 9 04
05 051 54 383.33 3.4 23 6.7 0.35 11 05
07 002 55 485.83 7.3 73 4.9 1.17 41 07
58 052 56 183.54 4.3 44 5.01 1.98 51 58
001 003 57 871.2‘ 9.4 15 5.11 1.101 61 001
NOTES
1 ehT tsellamS dlameter of workpiece for which n kcolb-V yam cb desu si dcnintbo morf eht groove width
a& taking into consideration the distance ‘s’ according to 8.3 dna eht ecnarelot fo yrtemmys ,f fo eht
.evoorg
2 ehT erugif si evitacidni fo cnoisnemid ylno dna dots not yficepS design features.
1) /I, js the theoretical noisnemid rof eht ,lch th,*‘ fo eht lines of intersection of the mounting secafrus gnikat otni
noitaredisnoc eht mulnixam cccipkrow ,rcrcmailt chl ~l;nOitClrrlsnoc dimensions and the distance ‘s’. roF 11~.
ereht si on ,ecnarelot tpecxe .taht ti llahs cb derusne tl:ht 3fI si retaerg naht 1)~.
IS 2949 : 1992
Table 3 Dimensions for Types A2 and B2 V-Blocks, V-Angle a = 90”
( Clauses 7 and 11.2 )
All dimensions ni .sertemillim
.
_==---_-=rz_ ----- pjqq=-
- -IlltsJAt
-----------
------_-__-_
[/IF
Width htgnleL thgieH Groove Dimensions Diameter of Workpiece ‘d’
b, --r y--h y--_h---> (-_---_----h-_-_ ----7
Mill rh ,h ba h, roF edarG 0 roF Grades 1 and 2
Max (.--_*_-~ r------_y
Mitl Max niM Max
40 50 40 32.363 1.2 31 2.6 21.0 4 20
40 75 40 31.798 1.5 .31 3.5 22.1 6 20
40 100 40 31.798 2.2 31 4.4 22.1 7 20
50 150 50 40.030 2.9 39 5.4 27.1 8 25
70 200 70 55.858 3.1 54 6’7 37.9 10 35

85 250 85 67.322 3.8 66 7.7 48.0 11 45
100 300 100 80.555 4’5 79 8.7 52.9 12 50
NOTES
1 ehT muminim retemaid fo eceipkrow rof hcihw a kcolb-V yam eb desu si deniatbo morf eht evoorg htdiw
b, gnikat otni noitaredisnoc ecnatsid ’s‘ sa rep 8.3 dna eht ecnarelot fo yrtemmys ,t fo eht .evoorg
2 ehT erugif si evitacidni fo snoisnemid ylno dna seod ton yficeps ngised .serutaef
1) ,h si eht laciteroeht noisnemid rof eht thgieh fo eht senil fo noitcesretni fo eht rellams eeV :;:;nikat
noitaredisnoc eht mumixam eceipkrow ,retemaid eht lanoitcurtsnoc snoisnemid dna eht ecnatsid .’s‘
0
ereht si on ecnarelot tpecxe taht h, si retaerg naht hh.
5