IS 4897: Deviations on untoleranced dimensions and mass of steel castings

15 Pages·1994·1.5 MB·English

by  Bureau of Indian Standards

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“The Right to Information, The Right to Live” “Step Out From the Old to the New”
IS 4897 (1994): Deviations on untoleranced dimensions and
mass of steel castings [MTD 14: Foundry]
“!ा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”

IS 7984 : 1994
qTn&nTm
( TJ’h?T;g )
d?WTT
Indian Standard
SNOITAIVED ON DECNARELOTNU
SNOISNEMID AND MASS FO LEETS SGNITSAC
( Third Revision )
<
First Reprint FEBRUARY 1997
UDC 669.14 - 141 : 621-753-1

@ BIS 1994
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
January 1994 ecirP puorG 5
leetS sgnitsaC lanoitceS ,eettimmoC MTD 17
DROWEROF
sihT naidnI dradnatS ( drihT noisiveR ) saw detpoda yb eht Bureau fo naidnI ,sdradnatS retfa eht
tfard dezilanif yb eht leetS sgnitsaC lanoitceS eettimmoC dah neeb devorppa yb eht lacigrullateM
gnireenignE noisiviD .licnuoC
sihT dradnats saw tsrif dehsilbup ni 1968 dna yltneuqesbus desiver ni 1976 dna 1986. ehT tneserp
noisiver si ylniam ot etaroprocni yllanoitidda eht elbacilppa gninihcam secnawolla dna eibissimrep
tfard ( repat ,j os sa ot ekam ti a evisneherpmoc ,dradnats gnirevoc at eno ecalp all stcepsa -ceffa
gnit eht snoisnemid fo leets .sgnitsac
yllamroN secnarelot era deificeps rof all tnatropmi snoisnemid no eht gnireenigne .sgniward ehT
snoitaived deificeps ni siht dradnats etaler ot decnarelotnu snoisnemid fo dcnihcamnu dnas dna
llehs dedluom .sgnitsac rehtuF gninihcam secnawolla era ot eb dedda rof edistuo snoisnemid dna
detcartbus rof lanretni .snoisnemid esehT gninihcam secnawolla dluohs ton eb ssel naht eht
muminim gninihcam htped ,yrassecen sulp eht evitagen noitaived ni eht esac fo edistuo -nemid
snois dna eht evitisop noitaived ni eht esac fo lanretni .snoisnemid
nI eht noitaraperp fo siht ,dradnats ecnatsissa sah neeb devired morf eht gniwollof :snoitacilbup
)i DC/OSI 8062 gnitsaC - metsyS fo lanoisnemid secnarelot dna gninihcam .’secnawolla
)ii hcezC dradnatS NSC 014470 ycaruccA‘ .’dradnats
noitnettA fo eht resahcrup si detivni ot eht tcaf taht ebissimrep snoitaived no decnarelotnu
snoisnemid yrav gnidneped nopu rehtehw eht denrecnoc leets gnitsac sevlovni llehs gnidluom ro
enihcam gnidluom ro dnah ;gnidluom os osla eht elbissimrep gninihcam ecnawolla dna .tfard
trapA morf gniwollof eht lufesu mron fo gniyficeps secnarelot sa llew sa elbissimrep secnawolla
no all tnatropmi ,snoisnemid eht resahcrup si desivda ot osla etalupits ni eht gniward ro ni eht
yriuqne dna eht ,redro eht ssalc fo lanoisnemid ,snoitaived gninihcam secnawolla dna tfard taht
eh dluow ekil ot eb dewollof taht si rehtehw ssalc ,Al 1 ro 2.
sl 7984 : 4991
Indian Standard
DEVIATIONS ON UNTOLERANCED
DIMENSIONSANDMASSOF STEEL CASTINGS
( Third Revision )
2.1.2
1 SCOPE Overall Dimension
1.1 sihT standard srevoc eht :gniwollof ehT tsegral elbarusaem noisnemid fo a gnitsac
ro a ralucitrap trap fo a gnitsac ni hcihw eht
1.1.1 elbissimreP snoitaived no eht decnarelotnu lanimon noisnemid is .detacol ehT llarevo
snoisnemid and mass fo sand and llehs dedluom noisnemid is ot eb deredisnoc ni a enalp lamron
leets castings ( ees selbaT 1 ot 7 .) tI stsisnoc fo ot eht lanimon noisnemid ( ees xennA A .)
eht gniwollof 3 sessalc fo :snoitaived
Class AI snoitaiveD rof leets castings -lovni
2.2 Types of Dimensional Deviations
gniv llehs gnidluom
Class 1 snoitaiveD rof leets castings -lovni 2.2.1 evitisoP noitaived is eht ecnereffid neewteb
gniv enihcam gnidluom eht mumixam elbissimrep noisnemid and eht
lanimon .noisnemid
Class 2 snoitaiveD rof leets castings -lovni
gniv hand gnidluom
2.2.2 evitageN noitaived is eht ecnereffid
1.1.2 gninihcaM secnawolla that yam eb neewteb eht muminim elbissimrep noisnemid
dedivorp no secaf hcihw era tcejbus ot and eht lammon .noisnemid
tneuqesbus gninihcam ( ees selbaT 8 and 9 .)
1.1.3 elbissimreP tfard that yam eb dedivorp 2.3 gninihcaM Allowance
( ees elbaT 10 .)
sihT is eht kcots fo artxe ,lairetam hcihw is
1.2 ehT dohtem fo noitacifissalc fo leets castings
dedivorp no eht tnaveler ecafrus fo a raw
desab no rehtehw yeht era edam yb ,llehs
,gnitsac no gnivomer ,hcihw ni eht ssecorp fo
enihcam ro hand gnidluom as nevig ni 1.1.1
,gninihcam eht gnitsac dluow attain eht hsinif
dluow osla ylppa rof eht esoprup fo 1.1.2 and denihcam noisnemid nwohs ni eht gniward fo
1.1.3. denihcam .tnenopmoc noisivorP fo gninihcam
,ecnawolla and eht tneuqesnoc ,gninihcam era
2 YGOLONIMRET
yrassecen reverehw eht ‘as ’tsac lanoisnemid
2.0 roF eht esoprup fo this standard, eht secnarelot that era elbaniatta era ton esolc
gniwollof snoitinifed shall .ylppa hguone rof a nevig noitacilppa and eriuqer
tnemevorpmi yb eht ssecorp fo .gninihcam
2.1 snoisnemiD gninihcaM is semitemos osla enod ot ecnahne
eht ‘as ’tsac ecafrus hsinif ro ot retla eht epahs
2.1.1
Nominal Dimension fo a gnitsac ot suit a ralucitrap .noitacilppa
ehT noisnemid debircserp no eht noitcudorp
gniward ot hcihw noitaived is ot eb deilppa 2.4 Draft
( ees xennA A .)
2.1.1.1 fI eht secafrus gnicneulfni a noisnemid tfarD is eht repat that is yrassecen ot eb -ivorp
era ton dedivorp htiw gninihcam ,secnawolla ded ni esac fo all lacitrev secaf ( secaf -idneprep
eht lanimon noisnemid fo eht lanif gnitsac is raluc ot eht gnitrap enalp ) ni a nrettap ot
eht noisnemid deificeps ni eht .gniward etatilicaf its withdrawal morf eht .dluom elihW
’tfard‘ is yliranidro dootsrednu ot naem eht
2.1.1.2 fI eht secafrus gnicneulfni a noisnemid repat dedivorp ni eht snrettap ro eroc sexob
era dedivorp htiw gninihcam ,secnawolla neht rof eht esoprup fo this standard ’tfard‘ shali
eht lanimon noisnemid no a gnitsac is lauqe ot naem eht repat dnuof no eht gnitsac ,secaf
eht latot fo eht noisnemid nevig ni eht denihcam hcihw yam tluser morf rehtie eht tfard ni eht
tnenopmoc gniward and eht tnaveler gninihcam ero&/snrettap ,sexob ro morf yna rehto ssecorp
.secnawolla .snoitairav
SI 7984 : 1994
3 PERMTSSIBLE DEVIATIONS ON tfihs fo epoc and ,gard egnahc ni lacirtemoeg
SNOISNEMID epahs ro ,eliforp ,egapraw hguor ,ecafrus ,cte
and rehto snosaer dluohs ton deecxe eht
3.1 ebissimreP snoitaived no eht lanimon
elbissimrep snoitaived detacidni yb eht -cepser
snoisnemid fo a gnitsac shall eb as nevig ni
evit class fo .ycarucca ehT emas snoitaived
selbaT 1 ot 3 ylevitcepser rof eht
partkdar shall be elbacilppa ot revoc egapraw ro
class fo .ycarucca
ytimrofnocnon htiw a nevig .eliforp
3.2 latoT egnahc ni a lanimon noisnemid eud ot
elbaT 1 elbissimreP snoitaiveD no decnarelotnU snoisnemiD rof leetS Cartings, Class fo ycaruccA
1A
1.1.1, 3.1 and 6.1 )
( Chuses
llA snoisnemid ni .sertemillim
Nominal Dimensions Overall Dimenslons of Rough Casting
L
---
GA pU 5ot Pc revO revO revO revO revO revO revO
6 “;b” 18 80 180 315
;J; $O$
o%lY ”!d% Y% fdz % % %
gnidulcni gnidulcni gnidulcni gnidulcni gnidulcni gnidulcni gnidulcni gnidulcni gnidulcni
6 10 18 30 80 180 315 500 750
(1) (2) (3) (4) (5) (6) (7) (a) (9) 00) 01)
10.30 f0.30 f0.30 53.otz HI.45 zko.60 oa*o* Ztl.00 zkl.25
a 106 - *OEL 30 03.otz f0.45 Mb50 to.75 00*1* f I 02* il.50
18 c - 03*ot* f0.50 06.Of 09*0* 00.lf 03.1* 05.lf
:: f0.60 o* 15 l090 02.lf 05.lf 57.lf
30 ‘s8 x 1 1 - 09ot* 02.lf 03.lf 07.lf f2.00
180 - - - - - 03.lf 05.lf 00.2* f2.50
1:; 315 - - zt1.70 l2.00 f2.50
315 500 _ - I I I z - 52.50
500 750 - - - - - - - Zj2:G
Table 2 Permissible Deviations on Untoleranced Dimensions for Steel Castings, Class of Accuracy 1
( CZuuses 1.1.1, 3.1 and6.1 )
llA snoisnemid in millimetres.
Nominal Dimensions
of Rough Casting Overall Dimensions
-w c- _A__,- 3
Over up ot revO 18 “3’0 revO 80 revO 180 revO 315 revO 500 revO 800 revO1250 revO2000 3 revO 150 5000 revO
up ot up ot “,“,‘d” up ot UP to UP to UFJ~” “a”,; UP: UP;0 UP to
dna dna dna dna dna dna “:I2
iuc]ud_ -dulcni -dulcni -dulcni -dulcni -dulcni -dulcni -dulcni -dulcni -d&ni -dulcni -dulcni
gni gni gni gni gni gni gni gni gni gni gni gni
18 30 80 180 315 500 800 1 250 2 000 3 150 5 000 8 000
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) 02) (13) (14)
- 6 *O-6 f 0.8 f 0.8 t d-8 f 1.0 f 1.5 + 1.5 f 2.0 f 2.5 f 3.0 * 4.0 * 4.0
6 10 f0.8 rtO.8 ho.8 f1.0 f 1.5 f l-5 f2.0 f 2.5 f 3.5 f 4.0 i4.0 f 5.0
10 18 f 0.8 * 1.0 * 1.2 f 1.5 f 1.5 f2.0 i2.5 f 3.5 f 4.0 f 4.0 * 5.0 f 5.0
18 30 - zk1.2 a1.5 t1.5 f 2.0 f 2.5 i 3.5 f 4.0 f 4.5 f 5.0 f 5.0 f 5.0
30 80 - - f 1.5 f 2.0 + 2.5 * 3.0 f 3.5 f 4.0 f 4.5 f 5.0 f 5.0 f 5.0
80 180 - - - f 2.5 f 3.0 f 3.5 f 4.0 f 4.5 f 5.0 f 5.0 * 5.5 f 6.0
180 315 - - - - f3.0 f3.5 f4.0 f 4.5 f 5.0 f 5.5 f 6.0 f 6.5
315 500 - - _ - _ & 4.0 f 4.5 f 5.0 f 5.0 f 6.0 i 6.0 f 7.0
,500 800 - - _ - _ _ f5.0 xt5.0 rt5.5 f 6.0 f 6.0 f 7.0
800 1 052 - - ._ - - - - f 5.5 f 6.0 i 6.0 f 7.0 zt 8.0
1250 2000 - - - - - - - - f 7.0 f 7.0 f 8.0 f 9.0
2000 3150 _ - _ - - - - - - f 8.0 * 9.0 f 10.0
3150 5000 _ - - __ - - - - - - i10.0 f 11.0
5000 8000 _ _ _ - _ - - - c -- - f 12.6
2
’/
IS 4897 : 1994
Table 3 permissible Deviations on IJntoleranced Dimensions for Steel Castings, CiaSS of Accuracy 2
( Clauses 1.1.1, 3.1 and 6.1 )
llA snoisnemid ni .sertemillim
lanimoN
Dimensions
fo hguoR gnitsaC
llarevO snoisnemiD
J;;i’v*-G”o
2000 3150 5000 8000
-hcni ;tniU ptnlU PU ot FntU PU ot PU ot up ot up ol ua$cJ ua$J PU ot
gnid dna dna dna dna dna dna
18 -ulcni -ulcni -ulcni -ulcni -ulcni -ulcni -ulcni -ulcni -ulcni -ulcni -ulcni
gnid gnid $;;d ;;;d g&d g&i8d gnid gnid gnid gnid gnid
30 80 1 250 2000 3150 5000 8000
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) 02) 03) (14) (15)
6 !i 0-l f 0-l kz 1.5 f I.5 f 1.5 k2.0 5.2* f 3.5 i 4.0 f 5.0 f 6.0 f 7.0 f 7.0
:: 6 :: f f 1.0 1.0 f f tr 1.0 1.5 1.5 ff f 1.5 2.0 1.5 f f f 1.5 2.0 2.5 f f f 2.0 2.5 3.0 f f f 2.5 3.5 4.0 f f f 4.0 3.5 O-5 ff f 4.0 5.0 6.0 ff f 6.0 7.0 5.0 f f9~ 6.0 O-67.0 f f+ 7.0 6.0 8.0 *f f o8.*0 79.0 f z 1Ok ;‘8
30 :8 I - f 2.5 f 3.0 f 3.5 f 4.0 tr 5.0 kz 6.0 f 8.0 z!z O-8 f 9.0 kz 10.0 tx 10.0
80 180 - - - f 3.5 f 4.0 f 5.0 f 6.0 f 7.0 f 8.0 f 8.0 f 9.0 f 10.0 f 11.0
180 315 - - kz 4.5 f 5.0 f 6.0 f 7.0 i 8.0 0*gk- f 10.0 f 11.0 f 11.0
315 500 z c - - - f 6.0 f 7.0 f 8.0 f 8.0 f 9.0 f 10.0 f 11.0 f 12.0
500 800 - - - - - - f 7.0 f 8.0 f 9.0 f 10.0 f 11.0 * 12.0 f 12.0
800 1250 - - - - - - - kg.0 & 9.0 f 10.0 tz Il.0 f 12.0 f 12.0
;250;~ - - --- --------- * 10.0 - f f 11.01 290 f i 1123..00 ff 12.01 4.0 t f 1146..00
3l5050()0 -, I -___-- - - f 15.0 f 16.0 f 18.0
”8&J-(: - - _ _ --_--- - - - - _ - - - - - - - X.;;“,O.“‘* -
Table 4 Permissible Deviations on I!ntoleranced Wall Thickness Of steel Castings
( Clauses 1.1.1 and 3.3 )
llA snoisnemid ni .sertemillim
llarevO Dimensions of lanimoN sseakcihT fo sgnltnaC elbissimreP noitaiveD
CMtlag c \
ssal% A1 ssalC 1 ssalC 2
xaM
(1) (2) (3) (4) (5)
up ot 500 up ot 10 f 1.20 f 1.5 f 2.0
revO 10 ot 30 * 1.20 f 2.0 f 3.0
revO 30 ot 50 f- 1.70 f 3.0 f 3.5
revO 50 ot 80 * 1.70 f 3.0 f 4.0
revO 80 ot 120 f 2.00 f 3.5 * 4.5
CY$er 500 ot 1 2501) up ot 10 f 2.0 f 3.0
revO 10 up ot dna lcci 30 - f 2.5 f 3.5
up
revO revO 30 50 up ot ot dna dna llccnnii 5800 * f 3.0 3.5 ;:t;
revO 80 up ot dna lcni 120 - f 4.0 f 5.0
revO 1 250 ot 2 500 pU ot 18 - f 3.0 * 4.0
revO 18 ot 30 - f 3.5 f 4.5
revO 30 ot 50 i f 4.0 t 5.0
revO 50 ot 80 - f 4.5 f 5.5
revO 80 ot 120 - f 5.0 f 6.0
revO 2 JO0 ot 4 000 pU ot 18 f 4.0 f 5.0
revO 18 ot 30 - f 4.5 f 5.5
revO 30 ot .50 - f 5.0 O&f
revO 50 ot 80 - * 5.5 f 6.5
revO 80 ot 120 - f 5.5 f 7.0
Over4000 pU ot 18 - f 6.0
revO 18 ot 30 - - f 6.5
revO 30 ot 50 - - f 7.0
revO 50 ot 80 - - f 7.0
revO 80 ot 120 - f 8.0
1) roF llarevo snoisnemid ni eht egnar - revo 500 ot 750 mm eht- elbissimrep snoitaived rednu ssalC A1 rof
eht gnidnopserroc ssenkciht llahs eb rehgih yb 25 tnecrep naht esoht deificeps rof eht llarevO noisnemid up ot
500 .mm
6 RETEMAXD DNA SGNIDNUOR
3.3 elbissimreP snoitaived no eht ssenkciht fo
,sllaw ribs dna webs for sgnitsaC may be 8s 1.6 For eht outside dna inside diameters dna
nevig ni elbaT 4. osla rof eht sgnidnuor ( edistuo dna edisni iidar )
eht snoitaived nevig ni selbaT 1, 2 dna 3 llahs
4 ELBISSIMREP SNOITAIVED ON SSAM ?ylppa roF snosaer fo gnitsac ,euqinhcet eht
rengised dliiohs redisnoc eht muminim =nemId
4.1 elbissimreP snoitaived no eht ssam fo snois deificeps ni elbaT 7 rof edisni .gnidnuor
sgnitsac llahs eb sa nevig ni elbaT 5. fI itht actual iidai llaf trohs fo eht muminim
snoisnemid deificeps ila Table< 7 eht -cafunani
elbaT 5 elbissimreP snoitaiveD no ssaM fo rerut yam esu sih noitercsid ot esaercni eht
leetS sgnitsaC retemaid fo sgnidnuor yletairporppa ot diova
.gnikcarc
( sesualC 1.1.1 und4.1 )
6.2 erehW eht lanretni renroc si demrof yb eht
Nominal Mass of Permissible Deviation
Casting ( kg ) on Mass, Percent gninioj fo owt strap fo a sgnitsac fo lauqenu
,ssenkciht eht elbissimrep suidar fo gnidnuor si
)--A--_r
ssalC AI ssalC 1 ssalC 2 nekat ot eb taht elbacilppa ot eht egareva -kciht
pU ot 52 f 0.3 f 0.6 f 0.7 ssen fo eht owt gninioj .strap
revO 52 pu ot 05 f 5.2 f 0.6 f 0.7
revO 05 pu ot 08 f 52.2 +- 0.6 f 0.7 7 GNINIHCAM SECNAWOLLA
revO 08 pu ot 00$ f 5.5 f 5.6
revO 005 pu ot 2 000 .- 5.4f f 0.6 7.1 ehT mumixam elbissimrep gninihcam
revO 2 000 - - f 5.5 ecnawolla rep ecafrus llahs eb sa nevig ni
selbaT 8 dna 9.
4.2 ehT lanimon ssam fo a gnitsac llahs eb
demeed ot eb eht egareva fo eht actual sessam
7.2 elihW eht seulav nevig ni selbaT 8 dna 9
fo a hctab fo ,sgnitsac all fo hcihw evah
era eht mumixam sa raf sa eht gnirutcafunam
snoisnemid nihtiw eht elbissimrep .snoitaived
yrdnuof si ,denrecnoc ti si nepo ot eht
resahcrup ot yficeps rehgih gninihcam -nawolla
4.2.1 yB roirp ,tnemeerga eht resahcrup dna eht
,sec fi eh os ,serised at eht emit fo yriuqne dna
rerutcafunam yam esoohc a tnereffid sisab fo
eht .redro
gninifed eht lanimon ,ssam dna osla ediced
tahw lliw etutitsnoc a hctab fo .sgnitsac
7.3 ehT noitaterpretni fo gnidivorp gninihcam
,ecnawolla dna sti pihsnoitaler htiw eht gnitsac
5 ELBISSIMREP SNOITAIVED ON -ERTNEC
secnarelot ( sa deificeps ni selbaT 1, 2 dna 3 )
TO-CENTRE ECNATSID
era sa detartsulli ni .giF ,al ,b c dna .d tI si ot

5.1 elbissimreP snoitaived no ertnec-ot-ertnec eb deton taht a gninihcam ecnawolla deificeps

ecnatsid neewteb deroc ,seloh ,sessob ,cte llahs ni selbaT 8 dna 9 s1 eht lanimon mumixam
eb sa nevig ni elbaT 6. tnuoma taht dluow evivrus ni etips fo ereht
gnirrucco eht mumixam elblssiqrep evitagen
elbaT 6 elbissimreP snoitaiveD no -ot-ertneC noitaived ni esac fo na lanretxe noisnemid ( ees
ertneC ecnatsiD neewteB deroC ,seloH .giF 1 a ,) ro eht mumixam tJbissop evitisqg
,sessoB ctE noitaived ni esac fo na lanretni noisnemid ( ees
.giF I b .) ,ecneH a ralucitrap gnitsac yam evig
( 1.1.1-sesualC dna 5.1 ) a latot gninihcam ,kcots rof ,elpmaxe ni esac fo
na lanretni ,ecafrits lauqe ot eht gninihcam
llA snoisnemid ni .sertemillim
ecnawolla deificeps ni elbaT 8 sulp eht mumixam
evitagen noitaived elbissimrep ni ecnadrocca
Nominal Dimensions Permissible Deviation
htiw selbaT ~1; .2 dna 3. sa eht esac yam eb ( sa
ssaG A1 issGicC elbacilppa ot taht ecaf desab no eht -aterpretni
pu ot 081 * 09.0 f 05.1 f 5.2 noit nevig ni .giF la ,) sulp eht elbissimrep
revO 081 pu ot 003 f 02.1 + 0.2 f 5.3 tfard ni ecnadrocca htiw elbaT 10. ,suhT nehw
003’revO ot.pu 005 * 03.I f 0.2 f 5.3 ti si detats taht a gninihcam ecnawolla nevig ni
revO 005 pu ot 0001 f 05.1 i 5.2 f 0.4 selbaT 8 ro 9 si eht ,mumixam ti snaem taht ti
si eht mumixam eulav dewolla revo dna evoba
OO71otpuOOO1revO - f 5.3 * 0.5
eht gnidnopserroc elbacilppa lanoisnemid -ived
revO 0071 pu ot 2 005 - f 5.4 f 0.6
noita sa rep selbaT 1, 2 ro 3 sulp eht -serroc
revO 2 005 f 0.7
gnidnop elbacilppa tfard sa rep elbaT 10.
4
Table 7 Corner Radii
( sesualC 1.1.1 and 6.1 )
Nominal Wall Thickness, mm
A-
O&PU 1 revO
rg;O :;O 120 % rz% ‘3:;
to to to to to to to
80 120 180 250 315 0 500
renroC iidar ( edisni ) 10 20 30 50 70 90 120 150
minimum value, mm
la External Machining lb Internal Machining

Ic Machining of Step Dimension Id Machining on One Side
NOTES
R = waR gnitsac ;noisnemid
F = dehsiniF ;noisnemid
4.M - enihcaM ecnawolla ( ees 2.3 dna 7 ;)
CT = gnitsaC ecnarelot egnar as rep elbaT 1, 2 ro 3; dna
D = tfarD ( ees 2.4 aud 8 ) ( ni siht noitartsulli DS stneserper eht ev+ tfard sa derrefer to ni 8.3 dna 8.4 .)
FIG. 1 ILLUSTRATIONO F MACHINING ALLOWANCEA ND STI RELATIONSHIPW ITH
CASING TOLERANCEA ND DRAPE
7.3.1 If a ecafrus gniriuqer gninihcam has a dnah gnidluom for gniyficeps the gninihcam
egaknil or a ecnerefer htiw erom naht eno tniop .secnawolla ecneH elbaT 9 srevoc lla dnas
or ,ecafrus neht the greater ecnatsid llahs eb ,sgnitsac edam yb rehtie enihcam gnidluom or
nekat as the lanimon noisnemid for the -rup dnah .gnidluom ,revewoH ni case of llehs
pose of gnivired the elbacilppa gninihcam dedluom gnitsac the retuo niks of the latem si
.ecnawolla yJvitaler ssel hguor dna erom naelc naht that
of yranidro dnas ,sgnitsac dna ecneh a ressel
7.4 ecnO ti si debircserp that the deificeps tnuoma of gninihcam stock deen ylno eb
gninihcam ecnawolla stneserper the tnuoma of devomer ot reach the naelc renni .reyal nI weiv
gninihcam stock revo dna evoba the elbacilppa of ,siht a separate set of seulav gnirevoc the
lanoisnemid ,noitaived ti si on regnol yrassecen elbissimrep gninihcam ecnawolla for siht puorg
ot hsiugnitsid neewteb enihcam gnidluom dna of sgnitsac si deificeps ni elbaT 8.
5