LATHE CHUCK
DRILLING SETUP
If your lathe doesn't have an oil tray or chip pan underneath, you will have to construct one. The tray needs 10 extend a few inches past the head stock spindle. If it does not it won't be to much of a problem to huild a cover thai will faslen III the lalhe or lray 10 caldt lile llil from Ihcbarrcl anti return il lo the tray. This cover needs to he high enough 10cOvcrthespindie hole with a piece of canvas with a hllic in II III keep Ihe oil from splallering all over everything.
COOLANT VOLUME REQUI R EMENTS VOLUME
DEI'TH OF HOLE
6" 1 2" 1 8" 29" 36"
HOLE nIA.
INCHES
3/1 6 - 1/4" 2 3 3 3 3
5/1 6 - 1 /8" 4 4 5 66 6
1 5/32 - 1/2" 5 6 8 1 0 "
1 7/32 - 3/4" 7 8 1 0 1 3 1 7
CHUCK COVER
You will need a t:IlVCt thaI will gu liver the J jaw chut:k. or (1I11CI, as there will hC4uilc a hilofuiJ Ihnlwn 'Iul lhcrc. Thbcl)\'crt:an hemadc w raiscstraighl up emu 1m the tn,n! there should he a long \Iu' h.dcar thctlrill ur rC<lmer luhc. Y[IU will alsu need an uit \,;untaincr •• tl al 1c<lM 55 gallon!'>. This c<ln he the oil drum thaI the oil !.:LImes in.
Thcrcwillalsu ncell 10 Ilea (unlilincrtJI al lea!>! 2u �;,II'J/t_, h!�';ttt:h the oil and t:hips herllrC il reI urns \0 lhe m"inIJilt:.mIHiul'r. Y" lI wil] need some kim.! ul O<lrnCS whirh (an he I im:h angle inll1 I"iu 11;11 in lhc lray in Ihe J'!lhc. Thb. i� to help )'cl'iHalc [hc (hips frum Ille uil. "nd help III settle lhc fine (hips. From there il goes 10 iI I 1/2 iudl return pipe un lhc lr<.ly. down [0 ahoul iJ foot off lhe nullom ul lht: 211 galJun cCJntaincr. This is Ut'J1C III hClpscparate the chips InUll Ihct.iI. From this cunlaincr the oil over now.� through a I 1/4 inch pipe 10 thc 55 gall"n urum, which i� laying un Ih �illc.
In rrunl urlhcovcrllow pipe is a lar!!c magnci which wlil lrap lhcvcry finc melal Thai lliull'\ have limc In scille. This will prolong lhl." life "f yuur pump.
HYDRAULIC PUMP
Yuu will ncell a hydwuli( pump that wili lurn lIut iI\ \c,I\' 54�l l�!lf rrc.�urc. and a gtxKl now ralc. You will nced the hi,!!h IHC\�UrC rur drilling to gCl lhc rcquircu now 10 rt'movc the chips. In thl' rC;lming operation. you will also ncctl il large volume nfuil ill kl�l'P the nutes dear. Nol cnuugh oil now anu the I1UIC� of Ihe Il'a mcr 11111.1 1 uin the reamer and hiHn:1.
COOLANT VISCOSITY
Conlanl viscl)sily ftnllrillsi1.t� 1/4 tll.VXinch�htIUld hcX!)/115 Sayl'lc,1t Secunds al UK) degrees.
PUI a barrel blank i n Ihe lalhe Ihal has theendsquared and trued, press Ihe unhardened Slaner bushing into Ihe bearing. Then very carefully move Ihe chip box wilh Ihe slarter bushing and bearing up flush with Ihe end of the harTel. Make sure that the hushing is Oush with the barrel, and not canted. Tighten down the chip hox, turn on the machine to makesurc all is running true. Ifeverythingis running true, set in the deep hole drill the size you are making Ihe hushing for, turn on the uil. SCI for low pressure. The drill point will just be Slaned in the hushing.
Turn on the lathe, and slowly feed the drill tip into the hushing, and into Ihc h,lrrcl forii dcplh tlfaht)ul a 1/4 inch. Rack(JUI when lhistlcplh is reached, shut off the oil, and (urn off the machine. This method can he used ira (orren size reamer cannot he ohtaincd. This mClhno will not give you the dosesl fit, hul if starting the drill very carefully will almost always give you a straight hole.
BUSHING (HEAT TREATI NG)
After the hand is drillt:c..I to size iI can he stamped for size, amI heal treated. Bring up the temperature in the furnace ttl proper lempcrd.
lun:. UI:Jllhl.! nushingwilh II CtlmpuuntJ [hal willsHJp Scaling,and put in the furnace. .I have used a surface hardening compound for this purpt)sc wilhcxcdlcnl results. Hardand Tuffisvcry gOixl. AsStlilfl as Ihchushing has rCl.lchcd the proper temperature. rcmOVC llnd qllcnl'il in it gmxl 4ucnchingoil. You will not nced 10 draw the \cmpcron [he hushing ilS we need all lhe lliInJncss we l<ln get.
Th;shushingwi!l lasl rur a many l'tarrds, anuwhcn ilslan, !OWC<.Lr, you will kllt)w as YIIU will start h) gel cHluked urr ccnlCr hl)Ic..�.
Uimensions for the starter nushin� I lule CuliitCl' U"iII Uiametcl'
1 72 . 1 64
224 .2 1 2
244 .2ZX
257 .244
Dlmen.loDs for the 2M .2511
Stareer Bu.blng 2711 .2M
284 .2711
.lOX .2Y3
.�().� .2Y7
32.� .304
3]8 322
350 34.�
375 3(�1
44 .4 1 5
457 .443
DEEP HOLE DRILLING
Normally in ltnytlccp hulctlrillingllpcratiun, the h:.rrcJ turn .. , IIntJ Ihe urill isstalinnary. The rCaStlO riiT IhisL"an he secn in. YIIU will notice thai with Ihcsinglc lipg.undrill lha\ ilunlyculsun nncctlgc. A, iltlrills in thcbarrcl it only cuts nn unccugt.:..and as it drill� it drills in Ihe !'Ilmel ils makes ilsllwn ,-"Cnler. Duc \ulhe high RPM urlhe h:.rrcl, it makes its own (cnler as il drills. This is Ihe rcasun why an ;u.:l.:oralc !Harler hushing is so impunanl.
Thc tlritling Ilfa rilk harrel is actually thcsimptcsi und mlIS\ trlluh!e frecuperaLion orall. When Ihc drill is nut Maned waigh! iI will try 10 pick up the center IJf rulatiun. and the hlile is lme !clOg L"urvc.
We nurmally turned out IOUur murcmmplclctJ rille I'IlIrrcls pcrwcek.
and in lhe tlrillingupcralion we L'Ould use lowskill help. Ali lhal was ry was for Ihe uperalurs was In SCI up Ihe ma..:hine. lurn it on.
They had 10 walch so Ihe drill wouldn'l plug up with chips, shul il off when done, and Ihen reload it and slarl again. When you gel everylhing sel up righl. you will be able to turn oul 3-4 compleled barrels a day with no problem on ONE lalhe. This is a compleled harrel lhal is drilled. reamed and rilled.
Now aboul lhe laSl lhing lhal will be needed is a special Sleady Rc&t 1O
SUPPO�I
lhe drill lubingas
il drills. This will help Loul down tile vlhrauons thai will some times start in the tlrill.You CAN NOT allow these vihrations to slart. If it uocs it l:an l:::.use the carhide drill tip III chip. and if you do not catch it in time it can also cause the drill to plug up and twiSi the tipoff. Will give you a good idea ofwhal " Deep Hole Drill looks like.
I want to point out Ih::'l this drilling setup is not limilcd lo just barrels.
It ("'3n he uscll for 4uitc a hit df other imJuslriul opcral ions. where extremely accurate holes arc neeued. Also with carhide drill tips. very hard sleel can he drilled. For odd shaped items whereyuu are unohle
PRESSURE AND VISCOSITY
MATEIUAL .156 .250 .500
LOW VIS. - I'.S.1. IIH. - HlHl 100 - 800 125 - 7lN' ALI.OY
1111; II
VIS. - 1'.S.1. 1110 - 8lH. 100 - 8lN. 125 - IMHI
AI.LOY 111(;11
VIS. - I'.S.I. 1 110 -800 11". -8lH. 125 - IMH' SI'I':":1l
:!IN. VIS - I'.S.I. I OO - 8lH' STAIN I.I'�"S
10 rOlale the drill. you can set up the operation where the drill can lie
rotatcd using special tooling.
PRESSURE AND VISCOSITY CHART.
Thcscwill givc)'uu thc prc.�sureand Visl;osily ("fYl/urOH Cuolarll for dilferent Iypes of materials. Do nut furget It) put the shield liver the end uf the harrel, so when you tlr[ll lhruugh Ihe harrcl the nil will nul he sprayed uver the enlire shup.
T O O L F O R G U N S M I T H S - A N D O T H ERS
W. o. MEEK oullincs an old mClhod of drilling barrels
.Host readers are familiar with
D-bits, which are used as substitutes
for reamers in many model workshops,
alld hare been referred to in several
}'1E constructional articles. But recent
qlleries suggest that the D-bit is not
as well known as it should be, e ven to
professional engineers. This article
describes one of the first and most
important applications of D-bits in
deep drilling and boring operations.
Oee tube! solder to bit
<",II" .... S,1 _
",""
WHILE
a gunsmith's the D·bit is pri1001. it could marily armourers and sword-l1l;lkcrs. They had developed a high standard of skill in smith's work. but they did not lise the lathe to any extent. II was foundpossible to make serviceable gun
barrels by hammer-welding bundles of wrought iron wires and h ... isling them drill, as we know it. has the advantage of being able to drill a hole accurately without the need for an accurate bed.
The drill bit itself is the accurate part.
Of course, modern deep�hole drills are
highly accurate, multi-s.pindle, motor
driven, high�speed machUlcs-but they , M�RCH 1962
are still the linear descendants of these old devices.
Before Hitler alter�d th,e s.ccncry.
there was a quaner In B mllllll!ham where many one�lllan businesses l11adc gun pans. There I saw and sketched traditionally used, but cutting oils are also suitable.
length or D-scction tubc. Thc pump was ground right (there was a mystique about the grinding) it would produce