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Datums and Three Plane Concepts-Geometrical Dimensioning & Tolerancing

Date post: 11-Feb-2018
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    0

    D@TVI] @GD TBF

    TB_FF ^K@GF MAGMF^T]

    Tr`hghgc OyJhsbar Ob`th`

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    D`tui

    @ d`tui hs ` pahgt+ khgf+ pk`gf+ ar atbfr

    cfaiftrhm`k sure`mf+ erai wbhmb dhifgshags `rf

    if`surfd wbfg sa spfmhehfd+ ar ta wbhmbcfaiftrhm`k takfr`gmfs `rf rfefrfgmfd' @ d`tui b`s

    `g fx`mt eari+ `gd rfprfsfgts `g fx`mt ar ehxfd

    kam`thag+ ear purpasfs ae i`gue`mturf arif`surfifgt

    ?

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    D`tui Ef`turf

    @ d`tui ef`turf hs ` ef`turf ae ` p`rt+ sumb `s `gfdcf+ ` sure`mf+ ar ` bakf+ wbhmb earis tbf o`shs ear

    ` d`tui+ ar hs usfd ta fst`okhsb tbf kam`thag ae `

    d`tui

    =

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    Tbfarfthm`k D`tui#s

    Truf d`tuis `rf tbfarfthm`k `s d`tui ef`turfs `rf

    mrf`tfd oy i`gue`mturhgc'

    Fvfg tbfsf sure`mfs `rf gat pfrefmt cfaiftrhm`k

    sure`mfs+ out tbfy `rf hgtfgdfd ta of ae sueehmhfgtky bhcb

    qu`khty tb`t `gy frrars tb`t i`y hgtradumf `rf

    hgshcghehm`gt hg maip`rhsag whtb p`rt takfr`gmfs'

    4

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    D@TVI] @GD TBF TB_FF ^K@GF MAGMF^T

    Cfaiftrhm`k eari takfr`gmfs sumb `s str`hcbtgfss %

    ek`tgfss rfefr ta ugrfk`tfd khgfs `gd sure`mfs+ da gat

    rfquhrf usf ae d`tuis'

    Arhfgt`thag `gd kam`thag`k takfr`gmfs rfefr ta rfk`tfd

    ef`turfs'

    Vsu`kky agky agf d`tui hs rfquhrfd ear arhfgt`thag

    purpasfs'

    6

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    D@TVI] @GD TBF TB_FF ^K@GF MAGMF^T

    ^ashthag`k rfk`thagsbhps i`y rfquhrf ` d`tui systfi

    magshsthgc ae twa ar tbrff d`tuis'

    Tbfsf `rf dfshcg`tfd `s prhi`ry+ sfmagd`ry %tfrth`ry d`tuis'

    Tbfsf `rf rfefr ta `s tbrff pk`gf d`tui

    systfi!d`tui rfefrfgmf systfi wbfg d`tuis `rf

    iutu`kky pfrpfgdhmuk`r sure`mfs'

    5

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    ^rhi`ry D`tui

    3

    He tbf prhi`ry d`tui hs ` ek`t sure`mf+tbfarfthm`kky ihghiui tbrff bhcb spats ag tbf

    ek`t sure`mf whkk maif hg magt`mt whtb tbf

    sure`mf ae c`ucf'

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    ]fmagd`ry d`tui

    2

    He tbf p`rt+ wbhkf kyhgc ag tbf prhi`ry pk`gf+ hs oraucbt

    hgta magt`mt whtb tbf sfmagd`ry pk`gf+ ht whkk

    tbfarfthm`kky taumb `t ihghiui ae twa pahgts'

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    Tfrth`ry D`tui

    8

    Tbf p`rt m`g skhdf `kagc wbhkf i`hgt`hghgc magt`mt whtb

    prhi`ry % sfmagd`ry pk`gfs thkk ht magt`mts tbhrdpk`gf'

    Tbf tbhrd pk`gf ofmaifs tbf tfrth`ry d`tui `gdtbfarfthm`kky taumb `t agf pahgt'

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    0>

    Tbrff pk`gfs magsthtutf ` d`tui systfi erai wbhmb

    if`surfifgts m`g of t`jfg'

    D@TVI] @GD TBF TB_FF ^K@GF MAGMF^T

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    D`tui syioaks `rf rfquhrfd ta sfrvf twa purpasfs `pfx'

    Tbf o`sf ae tbf trh`gckf sbaukd of skhcbtky crf`tfr tb`g tbf

    bfhcbt ae tbf kfttfrhgc usfd ag tbf dr`whgc'

    D@TVI HGDHM@TA_ ]XIOAK

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    0=

    D`tui ef`turf hs hdfgthehfd oy ` m`pht`k kfttfr pk`mfd hg `squ`rf er`if+ `gd maggfmtfd ta tbf d`tui hgdhm`tar syioak'

    D@TVI HDFGTHEHM@THAG ]XIOAK

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    ^A]HTHAG AE HDFGTHEHFD D@TVI]

    He twa ar iarf d`tui rfefrfgmfs `rf hgvakvfd tbfy iust of sbawghg marrfmt ardfr+ h'f' hg prhi`ry+ sfmagd`ry+ `gd tfrth`ry d`tuis'

    F`mb d`tui ef`turf iust of hdfgthehfd+ ushgc ` m`pht`k kfttfr ugdfrtbf eakkawhgc mhrmuist`gmfs:

    Sbfg twa ar iarf d`tui ef`turfs `rf `ssamh`tfd whtb tbf magtrakae ` shgckf ef`turf+ tbf d`tui kfttfr ar kfttfrs `rf tbfg pk`mfd hgtbf ef`turf magtrak syioak er`if oy `ddhgc `g fxtr` maip`rtifgtear f`mb d`tui rfefrfgmf'

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    IVKTH^KF D@TVI EF@TV_F]

    He ` shgckf d`tui hs fst`okhsbfd oy twa d`tui ef`turfs+ sumb `s

    twa fgds ae ` sb`et+ tbf ef`turfs `rf f`mb hdfgthehfd oy

    sfp`r`tf kfttfrs' Oatb kfttfrs `rf tbfg pk`mfd hg tbf s`if

    maip`rtifgt ae tbf ef`turf magtrak syioak+ whtb ` d`sb oftwffg

    tbfi'


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