o

DYNAMIC COLORING

~,

HORIZONTAL SPINDLE

VERTICAL SPINDLE

ONE HORSE.POWER

8 SPEEDS-DUAL BELTS

32 POWER FEEDS

TIMKEN BEARINGS

TRAVELS:12" Long10" Vertical7" Cross

EXACT DYNAMIC COLORS OF MACHINE

MACHINE

AIRCRAFT MACHINERY CORPORATIONBURBANK U. S. A.CALIFORNIA

MILLING MACHINES and" ACCESSORIES

A NEW PRINCIPLE has been followed in building this machine. Features foundonly in large. expensive milling machines are incorporated in this mill. simplyreducing the size to bench mill type. Latest design and rugged constructionwith close accuracy combine to offer an entirely new idea in the manufadureof small. yet powerful. inexpen'sive machinery. This is a bed type milling ma-chine with rise and fall spindle eliminating the old idea of using troublesomeinaccurate knee. The largest milling machines manufactured are of the bed type.

ARMOR MODEL JMwith Power Feed

(Belt guard not shown)

TOOL and PRODUCTION MILLING "

THE ARMOR MILLHAS BOTH HORIZONTAL ANDVERTICALSPINDLES. The horizontal spindle nosehas standard lathe threads externally for doingcertain lathe operations. The spindle is providedwith driver slots to which the arbor is keyed. Asthe arbor is keyed to the cutter also. there can beno slipping. Hand screw feed is standard equip-·ment. As an extra the Lever Feed Assembly forfast production can be used by operator at anytime in place of lead screw converting from toolto production milling with but little effort. Alsoavailable is a full automatic power feed whichdrives the table in either direction independent ofspindle rotation through a totally enclosed. revers-ible gear box. 32 power feeds available from.0015" to .013" per spindle revolution. 8 spindlespeeds provide a range from 98 to 1140 rpmthrough double-belted. cast iron pulleys. The backgear accessory has a low spindle speed of 33 rpm.

ONE HORSE-POWER MOTOR can be used. smallerif desired. Heat treated. thick wall. husky semi-steel castings provide a reserve of rigidity. Timkenprecision adjustable bearings are used in thespindle. Vertical lead screw is provided with ball-bearings to withstand resistance of cross head andwork being done. Self-lubricating Ledaloyl Bear-ings are used at other points but provided with oilreservoirs for double protection. Precision manu-facturing assures accuracy. Lead screws are guar-anteed not to exceed .0005" total accumulatederror nor dove-tail movements exceed .001". Acomplete line of milling machine accessories areavailable which will provide every tool needed fordoing horizontal. vertical and jig bore work. Dy-namic Coloring paint principle was adopted tocombine eye-rest and attractiveness with a highmorale and safety influence. Stationary parts arepainted vista green and moving parts focal ivoryas illustrated.

l

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TOOL UP SEVERAL SMALL MILLS INSTEAD OF INVESTING IN ONELARGE MACHINE. THE LOW INVESTMENT JUSTIFIES IDLE TIME ONSMALL MILL UNTIL PRODUCTION SCHEDULE REQUIRES ITS USE.

'.TRAVEL FOUND IN THIS BENCH MILL exceeds many-larger machinescosting several times more. It has 12" longitudinal, 10" vertical and7" cross travel. Likewise its weight is far beyond standard bench mills.It weighs 320,lbs. stripped. Semi-steel pulleys are used throughout thespindle drive, double belted on the slow speeds. Steel pulleys givestrength and fly wheel effect needed for carbide milling cutters. Allthree lead screws are securely embedded to protect from chips. Ac-curate micrometer dials are standard equipment on each lead screw.Four inch cranks give long leverage, reducing effort to turn lead screws.Gib locks are on each moving member. Deep throated tee slot in tablewill hold 1/2" bolt. Two spindle speed ranges give flexibility needed forslow steel cutters or fast carbide tip cutters. A planetary back gearis available as an extra accessory which will reduce horizontal spindlespeed to 33 rpm where desired.

GEARED POWER FEEDHeavy steel gears transmit smooth flowof power to table lead screw throughenclosed gear box as found only in ex-pensive machinery. Feeds from 1/4" perminute for high speed steel cuttersthrough 32 steps to a 15" feed for eer-bide.tip cutters. Power feed is fullyautomatic. Stop is set at any point todisengage power feed. Safety stops areon both ends of table removing dangerof overrun breaking table end bracket.One simple lever changes from, hand topower feed. Another reverses table dl-rection independent of spindle rotation.

HEAVY DUTY VERTICALATTACHMENT

No mere accessory. This tool is a heavyduty. high precision vertical spindlewhich converts the horizontal machineinto a standard vertical milling machine.Two types are available. One with fixedspindle and one with 3" quill travel.Both types, however. use the full verti.cal travel of the mill. The horizontalspindle toper drives the vertical attach·ment. Hardened bevel gears and anti·friction bearings provide smooth een-tinuous driving force of greatest pes-sible str~ngth to the cutter. Rods andindicator convert machine to an eeeu-rate jig borer.

LATHE WORK CAN BE DONEMany lathe operations can be done on the ARMOR Milling Machine. The spindle isthreaded externally with standard lathe threads for mounting chucks and face plates.It will swing 22". Compound and tool post can be mounted on the'table (priced inaccessories) to work on chucked parts. Small bar stock can be fed through spindle.Spindle taper is Morse No.2, a standard lathe taper, to accommodate lathe tools.Power travel to lathe compound is provided by using standard longitudinal powerfeed. Operator can perform milling operations both horizontally and vertically alongwith certain lathe operations without removing work from mill table such as in plasticmold work.

Accessories. Many available. See list.Lathe chuck mounted on nose of spindle,makes possible to handle many lathe jobs.

Vertical attachment uses full herse-pewerof spindle. Heavy d~ty type.

Power feed assembly showing gear box.Semi·steel pulleys illustrated.

Below:Adjustable motor mount and patentedautomatic belt tightener.

i'.~,~ MILLING MACHINE und ACCESSORIES

MODEL JMTRAVEL

LongitudinalVerticalCross

TABLESizeT-SlotWork Surface

4'/s':xI6"1-9/16"

Precision Ground

SPECIFICATIONS

12"10"7."

POWER FEEDSLongitudinal32 Feeds

12".0015", .0035", .007", .013" perspindle revolutionGeared full automatic with safetystop.150 to 15" per minuteIndependent of spindle rotationthrough gear reversing mechanism l

SADDLELengthLock Lever

8'h"One

Type

RangeTable

DirectionPULLEYS AND DRIVE

HorizontalSpindle

OVERARMLengthSolid DiameterSpindle center to overarm

GIB LOCKSAll travels

LUBRICATIONZerk fittingsOilers

MOTOR(Not furnished)Recommended-Y2 H.P.-% H.P. or I H.P.

DIMENSIONSAreaHeightCrate

WEIGHTSNetShipping-domesticShipping-export

Balanced semi-steel pulleys withdual belts on low speeds

18"I'h"2%"

Yes

YesYes

16"x20"25"

31"x31 "x28"

3201bs.3801bs.4501bs.

SPINDLESHorizontal TaperSpindle Nose ThreadedHole Through SpindleVertical TaperBearings

No.2 MorseYes-I '/2"-8"

17/32"No.2 Morse

Timken-Adjustable

STANDARD EQUIPMENTPATENTS PENDING

Standard equipment shipped with machine includes: l-Adjustable Motor Mounting Bracket. l-HandCrank. 3-Socket Wrenches. l-Complete set Table Stops. 2-Matched Spindle Belts. l-CountershaftBelt. l-Semi-Steel Motor Pulley. l-Instruction Chart. l-Guarantee Card. l-Final InspectiCfif='c-hart.

SPINDLE SPEEDSHorizontalSpindle

(Based on using1200 RPM Motor)

8 in open belt 98-150-220-300-370-470-680-1140 rpm(Standard equipment)16 with back ,gear33 rpm to 1140 rpm(extra equipment)8 in open belt100 rpm to 1140 rpm

VerticalSpindle

ACCESSORIES AND PRICESARMOR Milling Machine Model JM_, ,, ,, ,,__,, ,, ,,__,, ,, ,, "'''''_,, .'' $295.00Powe r Feed Assem bly inclu ding reversi ble G ea r BOL "" ,,_______________81.50Lever Feed Assembly, converts from screw to lever feed__________________________________________________________________ 47.50Semi-Steel Floor Stand ,, ,,__________________49.50Arbor Yoke, or outboard support for taking heavy cuts ". , """""""""""""_ 12.50Coolant Chip Pan"_""""""""_" __""""_"""""""""_"""""_,,_,,,,_,,_,,,,,,,,_,,,,,,_,,_""",,""" ,,_,,__"""",,_, ,,__,,__,,__"" __""_,, """_ 15.00Coolant Gravity Tank with Mounting Bracket, Flexible Tube and Metering Valve_"""" """""""""",,"",, """"_",,"""""""_ 15.00Coolant Pump complete with Motor and all tubes and valves.._""_""""_""",,,,,,_ """" "" __"" __",,"""" 67.50Safety Belt Guards covering all Pulleys..""",,_ ,,"',,"",,"_"" __,, "" ,, ,,_____________________ "" "" __,,_ '22.50Lathe Compound Rest Assembly incl. tool post and wrench ,, """ ,,__,,___ __"" ,, """"______________26.50Vertical Attachment, no quill traveL ,,__,,__,,__"" ,, """ " ,,__"" ,, ,, ,,__,,__"""" "" __,,__""""" ""__ 89.50Vertical Attachment, 3" quill 'travel. ",, ,,__,, ,, ,, ,, ,,__,, ,, ,, ,,________ "" ,, ,, """ __,,__ 119.50Arbor-'l'a" precision ground incl. spacers with keyway ,,__,, ,, ,, ""__ _"""" """"" "" """"""""""" __""___ 22.50Arbor-I" precision ground incl. spacers with keyway,, ,, "" ,, ,, ,,_____ __,, """ ,, """" __,, ,, """"___ 24.50Arbor Draw-in Bar "" ,, """ "" ,, ,, """" ,, ,, ,,_______""""" ,, ,,__""" __,, ,,_,,_,,,,_,,"__"""_ 2.50Swivel Vise-4" with graduated base... """""_"""""" ,, ,, ,,___ "" ,,__,, ,,__"" ,, """"" 23.50Dividi ng _Centers with Tail Stock-6" swing ",, :""_: .:_-:------,,--:--,,_-:----,,--,,----,,--,,--,,--,,--,,-" __"" __",," """"" ,, ,,,,"" """__ 35.00Dividing Head-6"-Standard 40 to I ratio, complete with Tail Stock and 3 plates.._____ __""_,,__,,__"" ,, ,,",," __"" __"" __ 135.00

~~~I:Js2.a;~:~~-i~"t~-p~=;.;-i-th"N-~.--2"M~;~-~--T~p~;::::::::::::::::::::::::::::::_::::::::::::::::::::::::::::::::::::::::::::::-:::-::::::::::::::::--:::::::-:::::::::::~~~h 3!:~~Armor Collet Chuck_",, __,,"" ,, " __,,_,,_,,__""_,, __,,_,,_"""" __,,__"" __"" ""_,, ,,___________ _" __,,_,, ,,,,"""_,, """""" 87.50Back Gear, planetary type, for horizontal spindle +0 provide 35 rpm __",, ,, ,,_ _ __,,__,, """""""" __"" __,,_____ 75.00Motors (Nominal charge for mounting) __: " _ ,,_ ,,_ ,,_ """ ,,_ ,,__________________" "" __""",, Standard list pricesSwitches (Nominal charge for mounting) """""" """_"""" __"""_" __,, ,,__,, __,,_______________ "" __"__,,,, Standard list prices

-c. ABO_VE QUOTATIONS F.O.B. FACTORY. BURBANK. CALIF.

Distributed by

Form MLJN 4610

l

Printed in U.S.A.

IN'STRUCTIONS

ARMORMILLING MACHINE

STARTING1. Remove rust preventative with grease solvent. Lubricate machine. Follow detailed instruction chart on serial number

plate mounted on base front. Accurately level mill to bench or base.

2. This ARMORMill is designed to handle one horse power motors. Obviously smaller motors may be used. Speeds as out-lined in literature are based on using a 1200 r.p.m. motor. A higher speed motor will proportionately increase speed range.

3. GIBS should be adjusted if table, saddle or cross-head do not move freely. While Gibs are properly adjusted at factory,they may change in transit. Properly adjusted, Gibs allow a free yet firm movement. If too loose, chatter or inaccuracywill result. After any change in Gib adjustment, securely tighten lock nuts.

4. ARBOR must be carefully clea~'ed before inserting in spindle. Remove dirt and foreign matter frmn tap~ in !!pin€lle--also. Taper is Morse No.2 equipped with driver slots to prevent Arbor slipping. Arbor must not be used without draw-in 1bar.' These accessories are available at factory.

5. ARBOR YOKE, or brace if used, must not be tightened until all vertical adjustments are complete and loosened firstbefore readjusting vertical travel. '

6. TABLE STOPS, when using hand feed, are put into action by raising stop Rest in center of saddLe. Loosen Allen setscrew, lift Stop Rest vertically to point where Table Stop will make contact, locking stop Rest in this position. Tablestop may be brought to either side of Stop Rest by loosening set screw and rotating Stop on rod. Tighten set screwin stop on flat of rod. If Power Feed is available and is used, drop Stop Rest out of contact with Table Stop, in order thatStop may contact trip plunger which activates the automatic stop mechanism.

1. SPINDLE SPEEDS are changed by belt position at ~ountershaft and motor pulley, Consult speed ~hart on machine.

8. BELT tension must be adjusted properly. If too tight, power is lost. If too loose, cutter will slip. When adju~ted prop-, erly, belt can be depressed one-half' inch, when pressing down midway between centers. Two belts are provided forslow speeds only. Use matched double belts to obtain best results.

OPERATING1. GIB LOCK. Before starting cut, tighten Gib Locks on two remaining movements. If using table longitudinal movement,

lock cross and vertical movements by tightening Gib Locks. These are set screws in center of Gib area. Do not confusewith Gib set screws for Gib adjustment.

2. OVERARM"'"atfd"ARBORSUPPORT must be securely tightened to prevent chatter.

-S. BACK LASH in lead screws can be reduced by tightening lead screw hub. Loosen set screw directly over hub before tight-ening bearing. Do not attempt to remove all Back Lash as it increases friction. Work with some Back Lash.

4. TIMKEN BEARINGS in hof'izontal spindle can be adjusted at pulley end of spindle. Bearings are properly adjusted at thefactory and should require no resetting until after long normal service. • ~

5. DOVETAILS and LEADSCREWS are vital parts of the machine. They should be kept free of foreign matter, oiled dailyand not abused by'forcing.

6. MILL from left to right whenever possible with cutter on arbor rotating clockwise to obtain best results. Will operatewell, however, in either direction.

7. POWER FEED (if machine is equipped) is engaged by lifting Worm Housing Lever, engaging gears and holding it in thisposition by Locking Lever. Power may be disengaged at any time by manually pulling Locking Lever from under WormHousing Lever or by setting stop to perform this function automatically. Table direction may be reversed irrespective ofspindle rotation by reverse Gear Shifting Lever located under spindle drive pully. This Gear Shifting Lever for reversingtable feed direction may be shifted while spindle is rotating but should not be done while cutter is in work. Consult feedchart on machine for Table Feed range and pulley arrangements,

ACCESSORIESMany accessories are available for use with the ARMORMill, adding to the operations it will perform. These accessoriescan be installed at any time on existing machines. Call, write or wire for literature and prices describing these ac-cessories:

Powerfeed Mechanism, Arbor Yoke, Arbors, Belt Guards, Gravity Coolant Tanks, Motor Driven Coolant Sys-tems, Coolant and Chip Pan, Floor Pedestals, Swivel and Plain Vises, Vertical Attachment, Dividing Centers,Dividing Heads, Slotting Attachment and Rotary Tables.

CORRESPONDENCE: In all matters pertaining to this machine, please refer to serial numbers of machine and motor.

AIRCRAFT MACHINERY CORPORATIONManufacturers of Armor Machine Tools

BURBANK, CALIFORNIA, U. S. A.Form MINV453

Domestic users may incorporate thePrecipitator in the heating' and ven-tilating systems wherever practicable,or small individual floor units that pluginto the lighting circuit may be used.Electrostatic'. dust precipitation in-

volves pass¢gall,. airhorne particlesthrough an-electrostatic. field and sub-sequently' <precipitat41g·the . chargedparticlesiorito oppositely charged col-lector 'plates.. " .'~fTheR8.ytheon. device· consists of

three principal. parts-c-the dust-col-lector cell, 'the. 'ionizer:unii; and the

- power supply.r-The ionizers are ener-~.~,'gized by the-::p.ower pack with hlgh-~ voltage direct 'current . to create a! strong electrostatic field. The collector~ plates are' periodically washed down

to remove the dirt although,. on some~ units, washing equipment will be com':'c pletely self-contained. ..., .

A 1200.cubic. feet per minute - Pre-, cipitator is said to .be able: to' clean,

by recirculation" the. an: in a, room ap-.·

.:', ~5,O,OO.(,,:( .1017,;,.:F.9.~~QLA~·',"'·\'PAc;~S:'\\r- ,;" ;-~;:HOPKINS~,

. :>,,';, 'iC'VCL.OPEDIA··" J'~ .;:,:;.,

~;;,;';OF/fORMULAS" ,.·':i"

CHICAGO '-WHEEL &! MFG~ CO.1101W;;¥ori~~' ~( .! DePt'-SA" .Chic..go 7, III.

.This isP~rhcips"the .:

·WORLD'S~.'"SMALLEST' MOTOR

1" "1%~·X.2" made for 27 VoltS 'DC' $3 0' 0 'runs :on' '4 ,Flashllgh~' batteries' -• • •• f REVERSmLE • -"DRIVE'it as"'a -'generatOr"':""'. '

BLAN 64~M' Der' Stre,et, "''New Yo",' 7, 'N. Y•

~kff~"\~~~~"-~_._A'"

'I<!~i%er~~~d"c6il~ct~r')~i(~nit.. ~ft.~,:"variations metch capadty"to air' flo~',;::,

prQ}d~ate1y, 35' 'by ;35:.bY:ii: fe~~ .,~~ j

with.a lf4 horsepower .motor blower, Is ,enclosed ina cabmet..measurlng 26 by27 by 54 inches.iStandard 115-"volt,60,.,;cycle power is ,USed.and it Is reported .that power consumption is. SO·.watts..per ',hour or less. than; :that consumed.by .the average reading. bulb., A Pte-.'cipitatorof thissize~· with the iristana-tion of suitable duct work, is des 'bed~1i~_:;tc:~~l~bv,ln~i1~,

ili~~~~prodricoon":work,iaS:'Wcll 'asint:rfdte s.:.~ft~::e~me~~~9, . .l:!~i;ll1d·'faIlSpindle·the=p:~' :;,J!I~!;~l~!!~~'avaUahle"which:T,'lliives the 'table ineither, direction through a reversiblegear boxfdr .feeds from 'lf4 inch' per

. ;~. ~,.,:~,:. ~,~:~., <'~' .' • I ( •

'rhou~;~d~ /0£ :~opies] ~£. thi~!'at':,'·,",~;j .; I :: .-.; ~.l.'--,.,. ." . '.' ," r':'~: 1 '

knowledged-deader.rarnong.books o~ .:

~(jf;i:liu~~f~t~'~iij~'used~;lllY.' :~>,;,-·)·:·~;(t j'l'- .,.f:::,,: ~..• ;",; .! ~.: .J.;"{

.c $S.50postpaid (Domestic )'J

Order' From'"},/' flf}-'- H. '''~-~'''''i'{f ': . _-;~i· •.• -:;'!.~ •.;:r:'": ,:lst'IENTIFIC" AMERICAN"j;i\:;~t~:o/~;~t,i,;~t,i;:,:):~~~~::;.~et:Y~~k,',l8.;f.~'el', .,., n~.,,·;:t·1 N~"Y.,' r : ;

., ",OPTICAl.> ~SPECIALT.'Es~.-Spectroscopes..' Optical, parts'-"~':;"1._;::;"·: ·:i?~~ent~.-d',;~, ~:'.',- .·,."AlumtnlZlng of.JDlrrora ... - ,·:.:','''CATALQG.ON. ,REQUEST-.. ~ ._•..•••_ ;, I' - .I fl. -/. ~!, ;(, ',' -, _ "

.,.Labora'tor,y.,Speeial~ies" Jne,.

.. ;"; ;,d~W~jj'tsH\Y~otA~~~~ .: ~i..

4,000·.' P~rts,~"Per: '. ~,:Jjay~'>!with-'~\"~,,••D1.A~IlO,Benjler

!I

"Enclosed is picture" -taken' in -o'ur-plant which'

, proves, the DI-ACRO Beod-,"'. ~r will do a real production

. 'jQb. We are ma\<jng .•4JOOp. cp~- .~;.<~::::~tiit:~r~~r~,"~~dwr4• ( •• .J. {Neme on .request.]

, ". . , • ~ '1Here'u an'example of "DIE-LESS DUPLICATING" tyl!icat({:;of a great variety of fonned part. readily made with DI.ACRO:' ,Precision Machines - Benders, Brakes, Shears. .Picture shQwsthe finished pUt formed "to die precision, including aqlte.~·right angle bend. Women operating DI-ACRO UNITS,'maintain a high out-put on 'production work. ;

"SE'ND FOR CATALOG

347 EIGHTHAVE., SOUTH,MINNEAPOLIS 15.· MINN.

JUNE ·1946 SCIENTIFic AMERICAN

:.

iI

275

, ,

AIl'Serious-Minded Production MenSHOULD HAVE,THIS FREE QOOKkET!

[II"""(II\'!

FORGING AHEAD IN. BUSINESScontains a message of particular impor-tance to' production men. This is youropportunity to' obtain a copy of thisfamous boo.k,which has been describedas a '''turning point in the lives oi liter-ally tho.usands o.fmen"!Altho.ugh "Forging Ahead in Busi-

ness" has been distributed to'more than3,000,000 men, to.day's timely.editionwas written in the light o.frecent wcrld-wide developments. Its 64 pages 'repre-sent more than three. decades oi sue-cessfulexperience in training men fo.rleadership in business' and industry.It demonstrates the method which

the Alexander Hamilton Institute usesto'give you immediate help in your pres-ent position, while preparing you fo.rpost-war opportunities. Subjects direct-ly related to. the work you are doingnow, PLUS other subjects o.ffundamen-tal value to. the business executive, arediscussed in the book 'and placed insignificant relation to.one another. Thus,a helpful, over-all picture is -provided,Said one man who. h~d sent fo.r

"Forging Ahead in Business":"In thirlyminlltes this little bookgape me a clearer pictllre of. mybllSinessfuture than I've ever hadbefore;"

••• and that represents the opinion of

the Institute's 400,000 subscribers, in-cJuding134,OOOproduction men!TheooC:klet further explains ho.w it

is possible to. offerthis essential train-ing in a minimum of time; ho.w the In-stirute program fits .inwith the mostcrowded o.f post-war' schedules.Amo.ng the prominenr-Industrialisrs

who. assisted in thepreparation o.f theCourse, which. is described in "FORG-ING AHEAD IN. BUSINESS" are:Alfred P. Sloan, Jr., Chairman o.f theBoard, General Moto.rs·Corp.; ThomasJ. Watso.n,·. President,Internati~nalBusiness Machines Corp., and FrederickW. Pickard, Vice President and Direc-tor, E. I. du Pour de Nemours &:. Co:

Send;for"FORGING AHEAD IN BUSINESS" TODAYI

. - . . .'" -, ~Frankly, this booklet has no. appeal forthe immature mind. It does not interestthe man who, fo.r.o.ne reaso.n or an-other, is wholly satisfied to plug alongin a mediocre [oh.Bur, fo.r the alert,future-minded individual-c-rhe man withambitio.n and "drive"....;."Forging AheadIn-Business'; has 'a'message o.f-distincrimportance. If you-feel that it is in-tended fo.r you, don't hesitate to. sendfor a' copy today; Simply fill in' andmail the ~o.upo.nbelow, .

----------------------------.-...:.------------------------,::;-~.;;:~.:~-.-----~--Alexander·Hamilton'Institute. ;Dept.3S, 71West 23rdStreet.Nti";York lO,N.Y.In Canada. 54Wellington Stree~West. Toronto I, Ont.Please mail me. without cost,' i·~opyof the 64-pagebook-"FORGING AHEAD IN 'BUSINESS."

ALEX-ANDERHA·M ILTONlN~STITUTE

Name .•............•.......•.•••••.•.•••••..•.•.•.•••

Firm Name•...•.•••..•.••..••••••.....•••..•••..•.•

Business Address; •..•.•..•..•.•.• '•••...• '•.•....••••

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Home Address, ...•...•••..••••.•.•.•. ; ...•...•..••

276

minute for high-speed mill cutters'through 32 steps to a 15 inch feed forcarbide-tip cutters ..Eight spindle speeds pro.vide a range

from 98 to 1140 revolutions per minutethrough double-belted, cast-iron pul-leys. The back-gear accessory providesa low spindle speed of 33 revolutionsper minute. A' one-horsepower .motoror smaller can be used if desired.Made by Aircraft Machinery. Corpo-

ration, the mill has a travel. of 12 incheslongitudinal, 10 inches vertical, and 7inches across. Two. types of heavy-duty vertical· attachments are offeredto convert the .horizontal machine intoa standard ..vertical .milling machine.

•"

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SPOT . WELDERMoves to Job viaOverhead 'Hoist System

USE of a single portable' .installationfor spot welding isone method whichmay help small plants to lower theunit cost of products to .a point of eco-nomical competition with larger fac-to.ries.· . .,One such installation, used at Vering

Manufacturing Company,' consists ofonly two welding" guns operating froma single transformer and with a singletimer 'and .air-hydraulic .booster:The entire' assembly travels on a

mono-rail "chain hoist,' thereby per-mitting the welding ·~uipment to bemoved quickly over a wide' area andraised and lowered at-will: for 'welding

. J ~- •.• "- • "-.' -. -", .:-,i -;.,; ~:;' ..

Small plant gets wide· use f~am.welder

SCIENTIFIC AMERICAN JUNE 1946