100 11 The felaim to hole teisfei ip aiiAii C0ii¾e liil

eoo^ietely foma thwig -aurt ^imeMi¾¾y«a!¾ia iit wall §002] Airfoils la a tar be era w often iosJii4e eoolkg holes for tei itotg & t&m of eoolmg air aloog ttie ooier satta of tfie ύϊ Ι afei im eoolkg, These may ¼ infered t s ¾m cooliag holes' ^* or "ilm boles,"

|W3| Cleaera!ly, co«liag: holes « rt tiragh a «I! i atreralf c mit i∞ » eatry to as exit s , it is that S*ese holes he iorored: eoomtetely throagh In otd r fe proper epilog, all cooliag holes ahoatd be f rme , completely through the wall of the component locked holes will ? eso.it I» overheated, areas or %«pots. ^>s itocte hofes can fee tie result of awn ietg ¾>!e :fematlo» or of deris k the hole,

10004] Oi¾s mhlerp with $ m pi M&mg coaling holet is that it ti very difleait aad tIo i-eoaumia ; to dateraiioe heher a eoaliag hole Is property fomed liroagti the wait of the compoaeai If or more Mes ar trot loraed pfoperty _s lie eoospooeot is rework d arid the felocked holes re e~dtiilo4 In order to

[OOOS] Coaveaitomi aiethoJs of verliyiag whether a eoollog hole _: prope ly Istad Irje le plo ehsete ahd ι water cheeks, 1¾ cheeks reqalro ao opersiorfp maoaatiy

associated wail, in -water eieeks, wafer ce m applied, iihiit m airfoil arid tie hole is observed to determiae whether water passes f toogh it BohYof these met ods ham. ass»eiated pro erm. The pla eheefe meifeod Is roaooal and eaa r U at repetitive moti n ia ries, Tho water oheek method eao he iaaeearate,. ϊ herefore there i s a aee fer a met o for tbrr ag eoeliraj holes throagh mrer&ft eoa?po«e»!& hich iiOOfporitti a step of yertfyiig wleifer a Coaling hole h properly tep d thrtigl the ¾ oae¾t . k aad M t0w km$ $mh a hole ete* «¾«i tr hol sagd. mm mscm f mu OF THE IKVIMT: to ci¾ 1» i¾e¾il is td#essetf $ a tft v »gm MiM mi 8 l a hole m rn^ imm mi « the hole fonMtio»,po«&.- pQQ7i c 4m m mm mp of the technology desedbei theres providd a *ne*.h<x! for hole f«¾atio« ssittg aa eleeir eat dsch ge mael.m.HHg tool

t pmtlaMmettL T e iwlMnchtdes Ihe ¾tep$ of: ^ iaikg the mt l mg m eleetroi to foroi a hole h moving the electr de away § on* a mnin pint; ^' verifying thm the tee is complete «s¾g he eteetkal discharge ta&dase .md whmm the vetiiyisg step iacnde th§ step ot robing he Irne will the efeetroife.

BRIEF mmM vum O TFIE DEA I CI fCKKIS) The inventon may he hsst »«deH¾¾i¾d by i t tie fall wing cfesclptloii ukm in coi iiciloii with te tcctw srytog dri trig ¾ in hfch;

m wlefeiii s will df the tisMm b i i mMph Mm Mm fm Moling tf¾ durn n rn d pgi i iii step of hole iwn. son shrou h he wall of Che turbine Made of FKl 1 taken along line 2 - 2 in FIG, I; ftJOf I ] FICF i i ero^ &sil ¥¾ of ftrpottta of tie il ito i! ½ FICF 2 sho in pene&ahon of dr wall by m efectrale;.

[IKIf ¾ FI , is a eross-sectiona! view of the portoa of t e wail s ow8 m FI0. _: sfeowlng that the eleerode i$ i da n dating a veriiieetion step when the h le was Isthallv eotteely Meat s lied eoaiplete; i¾ l 31 FiCi , 5 is a cros^secttoaai view of the portion of the wail shown In PIG..4 slewng the elee!nde e x»4h¾ i rong the wall dyring !he erltol a p whei tie hole ig: nkiafl emi&fy M imd m eonip!ee; 00141 FIG, 6 k a ero -seetJoaaf view oftfee pottlon of die wall s o * in FIG 2 snowing thai te electrode Is w &swn during a verification, step when the t te w s k & i ctiy k iii i as cmplte and 015J FIG. ? Is a ®s«»tioa&t vie of she portion of the wall snowu k FIG.

fehow tg te ¾tectrode postferied wdkti the hole arin the eoic loB step wten the hole was innially inco ectly ideatifled as com lee, AIL D DESCRI^tO OF ffi IN

θ ί 0 j .i¾;.tenmg to ξϊκΐ u¾ i g¾> \¾>erem: ?oetM st ietetets mraet is

s me ekme s drrougboiri dre various views, IG. I tIte ^" .a» m exempiaty turhke blade iO.1¾ mrhme blade !0 keliAs a e tweationai dovetail ! 2, which may have a»y suitable form, kelndkg tangs that enga e compleaieatary taags of a dovetail slot ka rotor disk (m sbowst) for radially ^tak l the Made I P to die dtsfeas iterates wng opetkott A blade ¾haak 14 extends radially upwardly from she dovetail 12 ■ mmm i a platter* 16 diat refects, laterally omwardiy fom am §«m $ ke slaiil R A tello alrfeil 18 emtods radially outwardly ton keplattera 16 ar into the hot gas stream. The airfoil has a root !? at m ^unctkm of the platfertrt 1 ami i tt l I S,: aad a tip 22 at its radially oute er¾l. Tlte airfoil II I» a eoaeave pressure side wall 24 ami a eouves..saetksi. side wall 2d joked togeker at a leading edge 28 and at a trailing edge M , fPOO] The airi il 18 may take my eonigatatlosi sktafek for -maetkg e∞ y torn ie hot s st m arid caask ro¾tkn f tlt rom disk, fie s!r&!i II may incorporate a plurality of iraitkg edge W sl ts 32 n toe re$i¾re side wall 24 of the airfoil I S, or it a i«eorporate a ka ky of railkg edge cooling holes (aot shows), lie ti 22 of the alribli 18 Is closed off by a tip cap 34 widen may fee ktegral

s nea!er tip 36 ojitend: mdlally ootward!y tern tie tip eap 34 and Is disposed :k close posii ir to a statloaary shrond (mi shows) k the asemhlod et¾gke, ia order to s wall If dlspcaesi ^' a spsced^aparf £ei&iet$$ to « saetlort side tip wall W; The tip ills 31 aad $9 aw ititegral to the mioi\ ) S aad form xtension c*f ¾e ptessrrre ■mud sitcfioa sid ails 24-md ¾ es ectivey, lite m i s mm a»d ■mtt t side ti walls ad -i¾s ecti I ihrm coot iuo«s stulaces ith tts outer strr&ees of the pressure md mti&m side walfe 24 m! 26, O IS] & piiii!lly of Ite cooling holes !¾ a dirorigfe t e tssrite side wall 24> Hie II to e hs holes !IXI of tie airfoil II eoaiomatkate wih ait int rior space if as shows m FIG.2, The listener s ce 19 am iedttde a complex arm«gemeai of co !mg passageways defoed by loteval wails. By way of xampl ^ ml Umt the OT« to passageways ο¾» ItsclPde one o die f>llowto characteristics: sot etiise, it stamkl be appreciated at airfoil IS m be taad frors a maerial ek as ¾ iMeket-hs&ed o

mm mmUy as ^epetallo ^ 0O19] R fer ng w to FIGS.2 ? _T , the pres i: provides- a taethod i r f eaiog a hole 100 thr ugh a wall, 1» the itettatd enibodtoeai, a idle is formed drroug ie pressure wail 24 m m electrical discbarge macMtbua tool 40, The electrical discharge machiobg process Is referred io as EDM feereirL It should appreciated th t the machms 40 mcksdes a eoo dier processor o showp) ooiigrtred to store, aiarslprtiate, eepm>ared, aod Mritdtet dati s¾eb as travel dtslpees, applied force, feydraultc pressure, electrical properties, ami Che like as sMlemied below, Tbe EDM: tool 0 also iactades a tubular electrode 42 i ®& extends to a tip 45, Electrode 42 iaciede a eoridrit 43 forrrted tlrere through lot Iwin debris If otrs die h le be¾¾ oOTcd and for providing aa electrolyt sohhoL ¾ EDM process^ Sold is pushed hi tlMm corsd lt 43 of the electrode 42 for Inbricatiert. p020] in a bole ooMa . or pesetratog.. step;, voltage Is applied to tbe e!ectro e sueli ¾8t the eicclrode 42 erodes as irt-pmccss hole 12© :b!« tbe wail 24 as sbowrtis* FIL According: tp the r½ « stop, tic electrode 2 away §oro a startfeg porat. drcc d» tip 45 § d^roagb the wall 24 s stewrt Is FI .3„ the cleclrode 42 ats stop io avoid crossitisg the interior space If and peaeP¾tiftg die wall 26 f the airfoil IS. f ^§ 02! ] ^' Tbm. ¾ is«mft«iEi«g statas ste to $eters^&e wilf ¾S*e BP topi 0 las wmkt«ly ferroed the fc roo as Itok 120 tk©«g tlta w ll 2. Is this regard, d>o EDM os i 40 is cjiifi med > monitor a red termn ρωβά$- ^' έ®ή&$ the pePetratiag step. Te property cats: e mx ekerteai property raxh as volage oretareht Alteriia&veiy,. tie ro^t : B;* fea hydrM& roa¾*y assoekted with te eiectolye flow or repare, Witos fie rtd t tiMPed property reaohes a ptedeten Ped vaiW _j tie maelia© 40 stops h peaet ati g st p, Stated apotler , ti com u r process r of ttiacltae 40 determin s dwmg t a monmrmg statu* step th the lole Is

to aaotler locaiios to ferm arsorfee-r tele, 9022 In oorarasr ^, to mveatkM tl processes, the rest arvepiiott ptwid s a vedfyiag step tl>at oeear before ti D : tool 49 Is relae te-d. The verifying step isAfe i Attg sis tad _* t fetiietlig ii¾ , la tk? pfobiig atep ₅ 1 trivet first

retraeitif step sfee e!ecii d«i 42 ased 1 f nt* the ia-prooess bote 12 Is retracted a predateoMaed seeosd pjstarsce X.. DPtttg. tie prohttrg step the olaetrode 42 is r^iaserred itsto tie hole 120 taibJ it s, !Sirrtng the probing step, t e electrode is stopped ^* fey eoataei witlt fe¾t&>t*i o an laeoaip!ereiy fetirad !role

of moni red properties described above, or heeaase tine probe has .r«¾el*e$ tie max mum travel disraaee,. The maximum n vel distance can fee determined bv a second, physical macli stop, or fey a a}easm¾er ¾uch as a predo&tiaiaed

tie predetefnaaed aeeoPd distance X and. ¾.& determnted stsefe that the bp 45 of the prote 42 ci! me n i m iiiifeioclecl aid coitipleiili ^' traei tele III) iiH te space Ts ^' d^mssd pmittip Mtd mm rn am In fixed by tie i charsJcai limits Γί¾ίό&Ρο 40<. I». ilia :r« y _» Piaehiae 40 ea» fee ¾ot¾:llf ared ! l _s by 0)v:ag 0¾ r« feroi»ed. m sai ai thlrf sli.¾aae _:i tie electrode 42 caa travel tales ie k-proces hitte 129 sach that te eleetfode tip 45 of tie electroda 42 -e^teads

ti¾ will 3 , Tiig a«! invei first distit¾¾ 11 tstetett ti Y Am m FIG.

|#053] Wiea the oleeisOtl 42 slo s ti veiag danaa the pfo lag ste , the aivel Itst l^^^ee ¾ I^ ne^ If the *r¾ vei -h^d ispnee i¾ te^**^ that lis? e ^,^trilti* second distance X, and afeout e cpal to r^©tef8&iis$ t&sxg iti third dist&oce., ft Is couctoded fat fa ln ^» io¾ ss k>le 420 o rn. It should be appreciated fat the dutfeg fa - &^&img M% _« t « hole 12$: might be toro«l s«efe that a space exists between the 45 of die efeedode md the botom of fa bole 120 i should be appreciated fat fa third distance is chosen such fat the space, I f my, Is aeooooed for, It*, addition, a deadbaud vafa am be added to the ««tetsm«»«d secori ih aBce X t acc unt for hs process variablity space. The dea l sd ibay b det¾ ¾s*ed ¾y r^eess hder¾tas¾fiog, I fee travel first distanc ¥ would be compaed to predetermined seeetrd distance X phs the deadbaMi alue. In a ½fr¾l:isg: ¾ _? ihi' Ae¾¾te 42 is wilfedia B ίκηη ihc i ^ r ss^ ole 120 and fa EDM tool 40 is relocated to form another i»»pi oe hole 120 at a new predetermined ioeadotfc l?024 FhGL < Illotrates an xample wherein die monitored pt^detemiloed properly meorteetly ndicate that the faproeess le 120 was complete. In diis sitnadoo. the eleet de 42 k ibdrawu in fa retracting step the ptedeterraloed econ distance X s indicated above. The proliogstei* is Initiated and rav ! tot: dlstaoce Tof d¾e elecuode 42 is∞s« ¾ fee W above, As showa in FIG, 6 _: . fa electrode 42 Is prevented ffpto felner travel during the probing ste because die bole is blocked. The travel first disanc Y is not about eo-oal to the predetermined t»a)dfinim t rd dlstaaee a»d is not substantially greater than fa prederenoiued second dis nce X, Thus it is determined that the hole is blocked At this in,* bole i¼r ng or pen¾r ln step is retoitiated, 1¾e progress of the m- roce s bole 1.2 ⁾ ss verified as desenbed above by the coiipdier tw«« ted u n the iwiltorgd properly, in litis fopri wtai the property reaches predeiertiiiaed vah.se, the bole iortuing: step is stopped and a verifying step is Initiated.

| 02:Sj The cycle of bote fernmioo aod verifying ears eontfae «II the hole is detern ned to fee properly ferrued through the eotnpeuent wall. fOO o] According to m alternative by, electrode 42 stopped dinlrtg the toonitoriag step thus defining a stopping, pont la the probing step, electrode 42 is then moved

- 0 - tteiter sway the mt g point $M pmi the sioppisg wfi¾«i irst ¼ag retracte toward the tarting oin

|002? e fbregol«g h descrbd a oreifi cl for fermb eoo&g lK>Ies in the airfoil. The method includes st ps I r wii i»s aad c .aHm¾a¾ whether the hole was satisfactorily forrrsed poor to forroatloa of anot er hole. This metfsod eas m¾*ce or eitet at hie: nee for o!!*lii» Quali cheeks siseh as p¾ eteohs aad ater clieM for hole i rmsikm, Ite the rocess lot ibrmmg holes b more eHesom md less iaho^ fensiv aceer din o the resent hr eshotL f 00:28] Bs«h ¾ai»r« disclosed, this s cI& k-wi (ifte!adlt¾:g any ¾¾«osspa»ysg c m i t mi da ings! tt y r !ioel hy atogtiw tt«s ttryfetg tte

SSW* ii» ie8i f sirMlar purpose, tsrhess expressly stated otherwise. Thu¾. rffifes expessly stated otherwise,: eae featur disclosed is o:tre exam e osiy of gen ric series of e^tilvaleoi or similar featores>

lie lovera1o8 e¾r¾ s m any oovel «e _} or iy oovel e !m loatlosi, of the features disclosed ¾ this eei¾ati rr {r«oi« i«g ·Μγ eoom^swiug i _f abstract aod r in s}, or t aay oovel o»e ₅ or aay oovel eom l Os of the steps of arsy meth d or pmee$s so disclosed.