Followingmarkingtraining,weproceededtohacksawingpractice,themostphysicallydemandingandstamina-ingprocedureinbenchwork.Ahandhacksawsistsofaframeandabde.Wheninstallingthebde,cuttihmustfaceforwardwithmoderatetightness;overlytightbdestendtosnap,whilelooseonesbendeasilyaiedcuttingpaths.Hacksawingimposesstrictrequirementsonposture,fordrhythm:standfirmlywithfeetapartandleanslightlyfripthehacksawframetightlywithbothhandsandkeeparmsstraighttopushandpullsteadily.Applycuttingforlyonforwardstrokesandliftthebdegentlywithoutpressureournstrokes,maintainingasteadypacethroughouttoavoidabruptspeedgesorexcessiveforce.
WhenIfirststartedhacksawing,Ihadnumerousproblems:stiffpostures,unevenpushingfordchaoticrhythmledtofrequentbdejamming,pathdeviation,utingsurfadevesawbdes.Meanwhile,repetitivemovementscausedseveresorenessandstiffnessinarmsandwrists,easilytriggeringimpetuousandsckemotions.Uheinstructuidance,Iadjustedmystandingpostureandforceappliethod,sloweddownthepadprioritizedstabilityoverspeedtokeepcuttingpathsstraight.Throughstantdrills,Igraduallybecameprofitinhacksawingteiques,capableofstablesawingwithgreatlyimprovedftnessofcuttingsurfaddimensionalprecision.Thispracticealsotemperedmypatiendstressresistance,makingmerealizethetruththatfineworkmanshipeswithslowandcarefuleffortsinbenchwork.
Filingstoodasthecoreandkeyprocedureofthisinternship,aswelsthedecisivestepaffegsurfacequalityanddimensionaccuracyofworkpieces,takingupmostofthetraininghours.Filesarecssifiedinthfiles,mediumfilesandsmoothfiles:roughfilesquicklyremoveexcessbnkallowance,mediumfilestrimoutlionominaldimensions,andsmoothfilesperformprecisionfinishingtoimprovesurfaish.Filingdemandsseamlesscoordinationofbothhands,bancedfordsteadymovements.Thefilemustmovehorizontallyandparallellywithoutup-and-downswinging,otherwiseunevensurfaddimensioionswilloccur.
Duringpracticaloperation,Istrictlyfollowedtheprinciplehfilingfirst,precisionfinishingterandstep-by-stepprocessing".Ifirstusedroughfilestostripsurplusmaterialsrapidly,switchedtomediumfilestotrimtoursonceapproagstandarddimensions,andfinallyadoptedsmoothfilesforfinishingpolishingtoguarapnes,reguredgesandprecisesizes.Filingisaremelytration-inteask;slightcarelessnessinforceletrolwillleadtooversizedimensionsorinedpnes.Duringtraining,impetuosityandunstablehandmovementsoncecausedwesandunevensurfaces.Ononeoccasion,excessivefiliedinundersizedworkpiecesthatrequiredrework.Throughrepeatedmistakesandrevisions,Ideeplyrealizedthatnocarelessnessisallowedinbenchwork,asmillimeter-leveldeviationswillimpairtheserviceperformaneicalparts.Icalmeddownandsloweddowions,measuringdimensionswithcalipersandtrysquaresaftereveryfewfilingstrokestoadjustposturestimely.Eventually,Imasteredftfiling,curvedsurfacetrimmingandchamferpolishingprofitly,andthefinishedworkpiecesmettrainingstandar
dsinftnessandperpendicurity.
Aftermasteringbasiualoperations,welearneddrilling,tappingaernalthreading,coreprocessesforthreadmaingofmeicalparts.Beforedrilling,wedouble-checkedmarkedtralpoints,alighebenchdrillwithpunchedpositioningdimplesandcmpedworkpiecesfirmlytopreventshakingandoffsettingduringdrilling.Wemaintaineduniformrotationalspeed,feddrillbitsdownslowlyaractedbitsperiodicallytodischargemetalchips,preventingdrillbitoverheatingandabrasion,oversizedholesormispcedholes.Drillingwasfollowedbytappingandthreading:tappiapstomaeinternalthreadsinpre-drilledholes,whilethreadingusesdiestocutexternalthreadsondriks.
Atthebeginningoftappingpractice,Ioftensufferedfromtiltedtaps,threadstrippingandbrokenthreads.Theinstructortoldmethatthekeytotappingliesiicalig,gentlepressingwithslowrotationandtimelychipremoval.Itisnecessarytoreversethetaphalfaturneveryfullrotationtoclearchipsajammingihreads.Afterrepeatedpracticefollowingthesemethods,Ifullygraspedthreadprocessingskills,produgwell-defihreadswithproperfitwithoutslippingorskewis.
Inthefinalphaseoftheinternship,wemovedontoprehensiveassembly,trimmingandassessmentoffinishedworkpieces.Iingallpreviouslylearnedskills,Iindepelypletedthefullfabricationofafinishedpart,cbnkmarking,hacksawingbnking,precisionfiling,drillingandtapping,edgepolishingandfinassemblydebugging.Afterpreliminarymaing,Iductedprehensiveiionsoh,width,height,