UTArms80illetLowerCompletiononaDrillPre文档格式.docx
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UTArms80illetLowerCompletiononaDrillPre文档格式.docx
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-3/8”DrillBit
-7/16”DrillBit
-½
”DrillBit
-DrillStops
-3/8”Endmill
-Calipers
-FixtureandReceiverFromUTArms
Newdrillbitsarerecommended,butnotrequired.Manyofthedrillingoperationsinvolvedaretediousandthedrillbitwilltrytowalkoutofposition.New,goodqualitydrillbitswillhelpminimize,butnoteliminatethiswalkingeffect.
1stOperation:
MountReceiverinFixture.
ThefixturesfromUTArmsmakethissimple.Simplyalignthesideplatesoneachsidesothatthepinsalignwiththefrontandreadtakedownpinholes.Squeezethemtogether,andthenplacethesuppliedboltthroughthemagazinereleasehole.Threadtheboltintotheothersideandtightenwithanallenwrench.
Mountthetopplatewith36smallholesinittothesideplatesusingthe4suppliedhexcapscrews.Makesuretheplateisflushwithbothofthesideplatesandtighten.
2ndOperation:
SpotDrill(36)1/8”Holes
Usinga1/8”drillbit,spotdrilleachofthe(36)holes.Justdrilldownabout1/16”intothereceiver.Afterallholesarespotdrilled,removethetopplateandfinishdrillingtheholestoadepthof1.245”.Byremovingthetopplate,youaresavingwearontheholesinthefixtureandyourfixturewilllastlonger.Besuretodrillthe1indicatedholeallthewaythroughtolocatethetriggerslot.
TheeasiestwayIhavefoundtogetthisdepthisusingadrillstop.Placethestopatthecorrectdepthonyourdrillbitsoyouwillknowwhentostopdrilling.Justcheckitoccasionallytomakesureithasn’tmoved.
Goslowwhendrillingtheseholesandremovethechipsfromthedrillbitoftentopreventwalkingandpossiblybreakingthebit.Usingalubricantwillmakedrillingtheseholesesasier.Theseholesaretimeconsuming,butifyourushyoucoulddamageyourreceiverorbreakadrillbitoffinoneoftheholes.
3rdOperation:
Drill(14)3/8”Holes
Thisisthemostvitalandmostdifficultstepoftheprocess.Itcanbedifficulttokeepthe3/8”drillbitfromwalkingoffcourse.Justtakeyourtimeandbeextracareful.Youwillbeprettygoodatitbythetimeyoufinish.
Switchtoa3/8”drillbitanddrillthe(14)holesindicatedonthetemplateto1.245”.Theseholescanbehardtodrillbecauseafterthefirstone,theholesbegintooverlap.Ihavefoundit’sbesttodrillthefirstrow,andthendrilleveryotherrow,andthencomebacktotheonesyouskipped.Theyarestilltricky,butthisleavesthesameamountofmaterialoneachsideforthebittocut.Thedrillbitwilltrytowalk.Keepareallyfirmgriponthefixtureandgoreallyslow.Thisprocesswillremovemostofthematerialinthefirecontrolpocket.
HereyoucanseehowIskiparowandthesmallportionofmaterialleftbetween.Whenyougobacktodrilltheskippedrows,goslowandtrytokeepthedrillbitfromwalking,especiallytowardstheoutsideofthereceiver.Ifitwalkstowardsthecenterofthereceiveryoucancleanitupwiththeendmill,butitwalkstowardtheoutside,itwillleaveagroove.
4thOperation:
Drill
(1)7/16”Hole
Switchtoa7/16”drillbitanddrillthe1holeindicatedonthetemplateto1.245”.
Nowyoushouldhavearoughfirecontrolpocketthatlookssomethinglikethis.Ifyoulookclose,youcanseethebitsofmaterialleftonthesidesbythedrillbits.Thenextstepwillcleanmostofthisup.ItookthispicturebeforeIdrilledthe7/16”hole,butyoucangettheidea.
5thOperation:
MilltheFrontPortionoftheFireControlPocket
Attachtheplatetothetopofthefixturethathas(6)1/8”holesinit.Besureitiscenteredasbefore.
Puta3/8”endmillinthechuckandmakesureitisastightasyoucangetit.Thedrillpressisnotdesignedforsideloading,andtheendmillwillhaveatendencytoslowlyworkitswayout.Checkitoften.
Iusea3/8”endmillwithacutterlengthof3/8”fromMSCDirect.Cutterlengthisthelengththecutterscomeupthesideoftheendmill.Longcuttersmakeitdifficulttomillthepocketwithoutdamagingthefixture.Justmakesuretheendmillyouchooseiscentercutting.
Forthefirstpassyouwillhavetogoreallyslowasyouwillbemillingdeepertoavoiddamagingthefixture.Adjustthedrillpresstablesothatthesmoothshankoftheendmillisatleast¼
”belowthetopsurfaceofthemillingplate.Failuretodothiswilldamagethefixture.
Lockdowneveryadjustmentyourdrillpresshas.Minehasalockingscrewonthetableheightadjustmentandonthecolumnwheretheheadswivelsleftandright.Youwanteverythingtobestillandstable.It’sbesttoleavethechuckallthewayupandusethetabletoadjustyourdepth.Justbesuretolockitbackdowneachtime.
Useplentyofcuttingfluidduringthisentireprocessandkeepthechipscleanedoutusingashopvacorothermeans.
Keepatightholdonthefixtureandmillinaclockwisedirectionusingthemillingplateasaguide.Thesmoothshankoftheendmillshouldrideagainstthemillingplate.Thefirstpasswillvibrateagoodbitasyoutakeaprettydeepcut.Slowandsteadyisthekey.Thispassisthemostdifficultandthemostlikelyforsomethingtogowrong.Stopafewtimesandmakesureyourchuckissecureandtheendmillisstilltight.Alsomakesureyouaredeepenoughandtheendmillisnotcuttingintoyourmillingplate.
Afterthefirstpass,dropdownabout.025”(25thousandthsofaninch)andmakeanotherclockwisepass.Thisoneshouldgomucheasier.Besuretokeepyourchipscleanandthecutterlubricated.Continuetomillgoingdown.025”witheachpassandgoinaclockwisedirectionuntilyoureachadepthof1.25”.Dependingonthelengthofyourendmill,youmayhavetoremovethemillingplateasyougetneartofulldepth.Justmakesurethatatleast¼
”ofthesmoothshankontheendmillisbelowthetopofthereceiver.Usetheareaonthereceiverthatyouhavealreadymilledasaguidejustasyouusedthemillingplateasaguidebefore.
Besuretolockdownalladjustmentpointsonyourdrillpresseachtime.
Thelastlittlebitofdepthisalittledeeperthantheholesyoudrilled.Thiswillgetridofthedimplesleftinthebottombythedrillbits.Thisiswhereacentercuttingendmillisimportant.
Besuretocheckyourchuckandendmilloftentomakesurenothingiscomingloose.Usingthedrillstopisoptionalhere,butIwouldrecommendusingitbecausetheendmillwillwanttoworkitswayoutofthechuck.Thiscancauseyoutogodeeperthanyouwantedwithoutknowing.Ifyoudon’tuseit,stopoftenandcheckyourdepth.Checkyoudepthaftereverypasswhenyougetcloseto1.25”.
Don’tworrytoomuchifthesidesofyourfirecontrolpocketarenotperfect.Youcansandthemsmoothwithafileordremelafteryouarefinished.
Afterthemilling,Ihadsomegroovesleftinthesideofthefirecontrolpocketwherethedrillbitwalkedoffalittle.Thiscanbesmoothedoutwithadremelwheneverythingelseisdone.
6thOperation:
Drill(6)1/8”Holes
Whileyoustillhavethemillingplateattached,puta1/8”drillbitinthechuckandspotdrillthe(6)1/8”holesasindicatedonthetemplate.Removethemillingplateandfinishdrillingtheholestoadepthof.625”usingthesameprocessasbefore.
7thOperation:
Drill
(2)½
”Holes
Puta½
”drillbitinthechuckanddrillthe
(2)½
”holesasindicatedonthetemplatetoadepthof.625”.
8thOperation:
MilltheShelf
Reattachtheplatewith(36)1/8”holesandmilltherearshelftoadepthof.630”usingthesameprocessasbefore.Someoftheshorterendmillsarenotlongenoughforthedrillchucktocleartobuffertower.Duetosizedifferencesindifferentchucksthereisn’tauniversallength.Iftheendmillyouhaveistooshort,justdoasmuchasyoucanandfinishtherestwithadremel.IwasluckyandhadalongerendmillsoIjustusedit.
9thOperation:
DrillFireControlHoles
Usinga5/32”drillbit,drilltheholesforthehammerandtriggerpinsthrougheachsideofthefixture.Drilleachsideofthereceiverseparately.Tryingtodrillallthewaythroughbothsidesofthereceiveratonetimewillcausethedrillbittowalk,andyourholesmaynotbeinthecorrectlocation.
10thOperation:
DrillSafetySelectorHole
Usinga3/8”drillbit,drillthesafetyselectorholeusingthesameprocessdescribedinoperation9.
11thOperation:
TriggerSlot
Turnthefixtureoverandlocatethe1/8”holethatyoudrilledallthewaythroughinoperation2.
Option1:
Drillasecond1/8”hole.365”towardthefrontofthereceiverfromthecenterofthishole.Thenusea5/16”drillbittoenlargebothholes.Youcanthenuseafileoradremeltoremovethematerialleftbetweentheholes.
Option2:
Drillasecond1/8”hole.365”towardthefrontofthereceiverfromthecenterofthishole.Usea3/8”drillbittoenlargebothholes.Thenusethe3/8”endmilltoconnecttheholes.Youcanclampsomeguidessuchasa2x4toyourdrillpresstabletohelpyoukeepastraightline.
Measureforward.365”fromthecenterofthe1/8”holeandscribealine.
Thenfindthecen
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