UNCLASSIFIED

AD 261,676

ARMED SERVICES TECHNICAL INFORMATION AGENCYARLINGTON HALL STATIONARLINGTON 12, VIRGINIA

UNCLASSIFIED

NOTICE: 'When government or other drawings., speci-fications or other data are used for any purposeother than in connection with a definitely relatedgovernment procurement operation., the U. S.Government thereby incurs no responsibility, nor anyobligation whatsoever;*and the fact that the Govern-merit may have formulated., furnished, or in any waysupplied the said drawings, specifications, or otherdata is not to be regarded by implication or other-wise as in any manner licensing the holder or anyother person or corporation, or conveying any rightsor permission to manufacture, use or sell anypatented invention that may in any way be relatedthereto.

pox,

Lake City Arsenal

PRODUCT ENGINEERING DESIGN STUDY OF

CARTRIDGE, 37MM, SPOTTING, XM415

- 4I. E. D. REPORT NR.61412

-ASTI A

PROJECT: 56-32 4010.15.0106.1.O1.62

JULY 1961A'ob•,

BestAvail*able

Copy

INDUSTRIAL ENGINEERING DIVISIONLAKE CITY ARSENAL

INDEPENDENCE, MISSOURI

00 0

PRODUCT ENGONEERING DESIGN STUDY OFCARTRIDGE, 37MM, SPOTTING, XM415

0

Industrial Engineering Report61-12

Project Number:4010.15.0106.1 01. 62

JULY 1961

Prepared by: Approved by:

FRANK W. LITTLEFORD JO N PISKORSKI, Acting Chief, IED

4GEORa E. RUPPf- "ARTHUR W. ANMaj, OrdCCommand i ng

o0

TABLE OF CONTENTS

Page

I. ABSTRACT

II. INTRODUCTION 2

II. PROCEDURE 4"

IV. RESULTS OF STUDY 4

V. CONCLUSIONS 9

VI. RECOMMENDATIONS 9

Vil. APPENDICES

A. Sketches

B. References

C. Distribution List

©0

(" L NAL rODOCUMENT WAS OF POOR

0QU1ALITY. B23 pOSSIBLE P.IJODUCTIONI4- FO:OM COPY IEN$}D ASTIA°

I. ' ABSTRACT:

This report covers the Industrial Engineering Division,

Lake City Arsenal, product engineering design study of Cartridge,

37mm, spotting, XM4f15, which is a sub-caliber component of the XM29

Weapons System. Experience gained at Lake City Arsenal in the

production engineering and initial manufacturing phase of Cartridge,

0 20mm, spotting, XMIOl, was fully utilized and applied. Altogether

some twenty-one (21) completely dimensioned and annotated component

drawings were generated, but no actual metal parts were made or

tested.

The modified cartridge case is similar in basic design to

the 20mm XM154. Two 'case plugs of different internal volume fit

the case body to provide the two ranges required of the spotter round.

The case wall thickness is the minimum which will safely withstand

ant-icipated excess chamber pressure requirements without additional

heat-treatment.

The projectile was simplified and improved by changing to a

conventional one-piece body with a male threaded fuze intruding into

the mouth. The external configuration closely resembles the XMIOI

projectile but for size; weight and c.g. are unchanged from the

Picatinny Arsenal XM1415 projectile. Several internal changes were

made for simplification of manufacture, assembly, or both, and several

components were eliminated thereby. The counterweight was changed

from lead to D-38 which was a major factor in the increase of the(71

payload by 23% over the Picatinny Arsenal projectile.

No assembly drawings other than a sectioned layout were

generated during this project, and if desired, will require additional

funding.

A study to modify the T336E7 fuze to the XM415 projectile is

in progress and will be reported Separately.

The subject study was completed in time that changes can be

incorporated by Picatinny Arsenal into the R&D and ET-UT quantities

if desired.

II. INTRODUCTION:

Because of the experience gained by the Industrial Engineering

Division, Lake City Arsenal, in the production engineering and

initial production phase of the Cartridge, 20mm, spotting, XMIOI,

this arsenal was funded by Picatinny Arsenal, ORDBB-TW4, to conduct

a production engineering design study of the subject cartridge, and

supply Picatinny Arsenal with a set of engineering drawings.

The function of the XM415 cartridge is to provide spotting

(i.e., direct range determination) information for the XM29 Weapons

System. To accomplish this a "Dial-the.Zone" cartridge case was

originally designed by Picatinny Arsenal to cover the two ranges of

2

a®

the major weapon. However, by the time IED began the subject engineering

study this "dual-zone" case had been droppqd in favor of two separate

cartridges, one for each zone.

The XM415 projectile differs from the XMlOl in that the spotting

mix is ejected rearward and upward, thereby substantially increasing

the probability of visual observation under all conditions of weather

and terrain. The rear ogive of the XM415 projectile body is opened by

a small PETN charge in the front of the tail boom.

After completion of this study, drawings were received from

Picatinny Arsenal showing a cartridge case (Drawing AA-44-1666) similar

in external configuration to the LCA case generated in this study. The

wall section is much thinner and heat-treatment is required for the

necessary strength. A case mouth anneal is not indicated. Two case

plugs, metering disc and metering disc cover incorporating LCA redesign

features, were then made up for the PA case, theorizing that the gun

chamber configuration may have been frozen.

Experience with the XM154 case and similar items indicates

that warpage caused by heat-treating will substantially increase the

inspection rejection rate. The PA case (Drawing AA-44-1666) is 1.6"1

longer than the LCA case which increases material cost by 15%, plus

the alloy costs. The taper of the PA case is substantially less than

the LCA design, and increased extraction problems are anticipated thereby.

3

Illi. PROCEDURE:

All Picatinny Arsenal component and 'assembly drawings were

studied in detail as to materials used, methods of manufacture required,

functioning of each item and assembly, special assembly and inspection

techniques required, and general over-all practicality.

During the entire study and subsequent redesign, parameters

established by Picatinny Arsenal were closely adhered to.

No actual components were fabricated, the entire operation

being a paper study.

Completed component drawings were delivered to Picatinny

Arsenal, Messrs. E. Roof and D. Trevarrow, on 13 July 1961, and the

various recommended changes from the Picatinny Arsenalr design

thoroughly discussed.

IV. RESULTS OF STUDY:

A brief resume of changes made, with reasons, to the major

components follows:

a. Case Body, Drawing LCA-SK-423

Change Reason

Increased taper Better extraction

Standard threading Lower tooling cost

No heat-treatment Lower processing cost andrejection rate

Carbon steel Lower material cost

Reduced over-all length Material & machining costs reduced

Rimless configuration used Savings in material and processingrealized.

4

0

b. Case Plug, Drawing LCA-SK-421 (long range)LCA-SK-422 (short range)

n Reason

Igniter tube eliminated Improved ignition and decreased

velocity dispersion at less cost.0

Carbon steel Lower cost

No heat-treatment Lower processing cost & rejection rate.

Firing Plug (Dwg. 74-2-78M) Firing pin impinges directly oneliminated primer. Less cost & more positive

action.

Four (4) torque holes are used Positive night identificationon the long range plug, two (2)only on the short range plug.

Counterbore removed from torque Simplified tooling, &lower cost.hole

c. Metering Disc, Drawing LCA-SK-424

Change Reason

Single size & same number of holes Reduced tooling & production costs

No trepanning Lower costs

Fool-proof assembly Same disc used for both ranges,, nochance, of mistake in loading.

d. Metering Disc Cover, Drawing LCA-SK-420

n Reason

Thickness increased to .005 from Improve ignition.003 used by Picatinny Arsenal

One cover for both ranges Simplify production & loading, andreduce costs.

5

0

0

e. Projectile Body, Drawing LCA-SK-h46

Change Reason

Eliminate threaded jincture in Concentricity requirements cannotcenter of body be maintained in production.

Adapter (PA Dwg. AA-hh-155h)eliminated. Improved body security.Improve interior ballistics as body0 .D. can be held to closer limits.Improve exterior ballistics as thethread concentricity problem iseliminated.

Moved obturating band rearward Reduces length of case as projec-tile iitrusion is less. Materialand machining costs reduced thereby.

Changed material of the counter- The volume saved thereby isweight (P.A. "insert" ) LCA-SK-hh3 added to the payload, increasing

it by some 23%.

Visual effectiveness increased The increased volume (23%) ofspotting mix will substantially

ayload Volume. 'increase the display. Observa-LPlAd* l,.67 cu. in. tion of the projectile under

L.C.Ao: 1.919 cu. in. adverse weather and terrain condi-tions, and in the Arctic, should be

greatly improved.

Band seat configuration A conventional double-undercut bandseat was. added to assure bandsecurity. Obturation is achievedby interference rather than by gaspressure as on the PA projectile.It is believed the PA band will comeoff causing external ballisticproblems.

Band material Teflon instead of geon is shown asthe banding material. Experiencewith geon in the XMl1 programindicates that it scuffs off easilyin the barrel and is a cause ofvelocity dispersion. If teflon isunacceptable, a 10/1 Pb/Sn alloy bandis recommended.

Body material Changed to C-1030-hO steel rather thana "resulphurized" grade, which is sub-ject to seams; causing securityproblems when fired.

6

Change Reason

Simplified charging and loading Encapsulation of ejection :hargeeliminated. The black powd.r isdirectly loaded into the bodyduring projectile charging S,assembly sequence. Ejection char:•volume is the same as on the PAprojectile and is placed within asteel sleeve which also acts as asupport for the counterweight.

External configuration Much the same as the current X~iQIprojectile, which closely matc!.s t-heexterior ballistics of the majorround. This configuration Plso. contrilbutes toward increased "payload''.

External scoring Removed internal score marks fromcritical thread area. Simplifiedmachining.

f. Igniter Tube, Drawing LCA-SK-445

Change Reason

Simplified configuration The rear portion of the tube is

SORIGINAL no flanged outward so it will: seat ona shoulder in the tail boom (L'A-

RIJALITY. BEST POSIBI•' IODUCTIOnI SK-444). This eliminates one partYROnm COFY IONIUM ASTIA.,,, (PA AA-44-1250)and a silver

soldering operation.

Threads eliminated As the igniter tube is self'-s'Y,.crtinthe rettininq nut at. front of i.tube in unr, cas.J:rv. The ;oLfn. .rb'-in the counterweight is 5 ,": .'imloatf-.i

g. Tai.l Boom

Change Reason

Thread pitch to 24/in Increased strength

External configuration Changed to conform to rear ofprojectile body. This will alsopermit easier entrance of air intofins.

7

Change Reason

Direct charge PETN Eliminate separate cup and-disc,thereby lowering cost by 0liinat!inof these parts.

Drill point In PETN cavity Facilitates production and eas, ,Inspection.

Front end configuration A.crimp type configuration wasadded to the front end to holdIgniter tube and facilitate auto-matic, remote handling during assemlyoperations. Security of boom andIgniter tube assembly is Inci-;a::.

h.- Tail, Drawing LCA-SK-447

Change Reason

Leading edge radius Change to a "V" edge to facilitateproduction and inspection.

Leading edge sweepback Leading edge tilted back 30° toenhance aerodynamics.

Thread pitch to 24 /in Increased strength

Reduced over-all diameter To minimize concentricity tolerancebuild up.

* 6 - Fin Data indicated 6-fin type superiorto 4 fins In availability of areato, prevent side--draIt or yaw.

* Fin caps Caps act slil-er to a shrou4 wlIthowtas great drat..

* 'These changes permitted s-ho•rteninyjof fin lenrth thusdecreasing cost of expensive extruded material, but willrequireia._tegth of boom as per LCA-SK-444. Shiould 4-fIntail (LCA-SK-451) be adopted, boom will need be as perLCA-SK-439.

8OVHA OXI~flrL DMUMIM7! WAS CWQUTALITY. NEST POSSIBLI HMODUCTI•Q.'tRO COPY FURNIiiD. AW•XA.•1

V. CONCLUSIONS:

It is believed that changes developed by the subject

production engineering design study will improve the ballistic

reliability and producibility of Cartridge, 37mm, spotting, XM415,

without significant change in the required military characteristics,

and this at a substantially lesser cost per, round.

VI. RECOMMENDATIONS:

it is recommended that:

a. A small test quantity of the LCA modified Cartridge, 37mm,

spotting, XM415 be manufactured for comparative ballistic test at APG.

b. Funds remaining on this project be expended on a study

toward modifying the T336 fuze for use with the subject cartridge.

,2O[(••I• DOCU• •AS O•' pOOTR'1ý OwOSUaP I-E-pROD-UCTION

9

VII. APPENDIX A.

Sketches

LCA-SK-419 through LCA-SK-428

LCA-SK-.439 L;hrough LCA-SK-451

Unnumbered Sketch (Assembly)

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VII. APPENDIX B

References

APPENDIX B()ORDNANCE CORPS

• PICATINNY ARSENAL

DOVER, NEW JERSEY FT RDecker/vjt/72205.

IN R1EPLY A" 17

REFER TO:

ORDBB -TW4

SUB3JtCT: Cartridge, X4415E3. M M!,DOt WAS C •WZ

,V:.TUY, BWEST POSSIBLE REMODUG1I0N

7f;,0,, ~WY MMI1HED A32'IA1

TO" Commanding Officer

Lake City ArsenalATTN" ORDC-LIE, Mr. j. Piskorski

independence, Missouri production engi-

1. It is requested that your Arsenal conduct a leng1 It ichuei n r c m e d a ngesply a eading

neering study of subject Cartridge and reco fed any sto reduction o facturing costs, broadening of supply base, un-proving reproducibilityo or reduction of acceptance inspection costs

while maintaining high assurance of col.foXance to design. t onthly

reports, due at this Arsenal by the 5th. day 1 the reporting

period, and a final report, due by 30 June 1961, are required with

the study.

2. A set of photo prints covering subject Cartridge was

furnished to MIr. F. W. Littleford, of your Arsenal, on 16 March

1961.3 unding of $6,000.00 is being forwarded to your Arsenal for

the above Rtudy.

FOR TlE COMgANDF•-

O:Ord Wpns Cored ,-u 3,',,r

ATTN: Major Rodger ul,

APPENDIX B (2)

WORK ORDER

. rdIansolt Amyno Comnand 2T:3~DT

(take City Arsenal) OUDLI-AM 11 April 61

FROM ndI O FROM: 4, DOCUMENT CONT.tomaning fficr r)NUMBER

Piostinny Arsenal, Dover, N.J. .020O24.010.010.

5. OMS CODE AND TITLE 7. A. B. C.ELEMENTS QUANTITY UNIT TOTAL

4010.15. 0033.2. 00. 54 UNIT: PRICE COST

D428 and XM29 Weapons Sy-te' PRIOR 10,00

INCREASE 6 1,'006. APPROPRIATE ACCOUNTING CLASS. OF FUNDS

(TO BE) MADE AVAILABLE DECREASE

21 X2030 105-3115CURRENT 16 ,(00

t> ofl. s/23-.o12 -.... __ __ _ _ _ _ __ _ _

TOLERANCE

8. PERFORMANCE OF THE FOLLOWING WORK IS AUTHORIZED (SUBJECT TO AVAILA13ILITY OF FUNDS)

The purpose of t1is AOS-20 im to provide ndditional authority for

the following. To conduct prolduction enrineoring study on Cartridge XM415E3,

Rmference: letter from FA to TCA dated 7 Apr 61.

Subject: CLrtridge XFV415E3, signed D. Trovarrow:,

9. DELIVERY SCHEDULE AND INSTRUCTIONS

Activity of thti order must be I.nitleted on or before 17 April 1961and all activity must be completed on or before 30 June 1961.

1O. ENCLOSURES

None

FOR USE BY ADDRESSEE 11. AUTHORIZED BY , ./

12. CONTRACT ACTIONSA. DATE ORDF3-T-2 E. Ruben 13 April14B. NUMBERC, AMOUNT TYPED NAME & TITLE S-N-ATURE AND DATE

0O FORM AOS.Zo APR 50 REPRODUCIBLE

VII. APPENDIX C

DISTRIBUTION LISTCopies

Chief of OrdnanceDepartment bf the ArmyATTN: ORDIM Del lastatious 1

ORDTS Thul in 1Washington 25, D.C.

Commanding OfficerPicatinny ArsenalATTN:' ORDBB-TW4 Roof 2

ORDBB, Trevorrow 2ORDBB-PC 2

Dover, New Jersey

Commanding OfficerOrdnance Ammuniition Command (7,

ATTN: ORDLY-AIDL, Quality Assurance Library 2Joliet, Illinois

Commanding GeneralOrdnance Weapons CommandRock Island, Illinois 2

Commanding OfficerFrankford ArsenalATTN: Library Services 0270 2Philadelphia 37, Pa.

Commanding GeneralAberdeen Proving GroundATTN: Mr. Goodwin Morrow

Technical Library IMaryland

Bureau of OrdnanceDepartment of the NavyATTN: RMMO-45Washington 25, D. C.

CommanderNaval Ordnance LaboratoryATTN: Technical LibrarySilver Springs, Maryland

SU

a

VII. APPENDIX C

DISTRIBUTION LIST (Continued)

Armed Services Technical Information AgencyTI PCAArlington Hall StationArlington 12, Virginia 10

Commanding OfficerLake City ArsenalATTN: Remington Arms Company, Inc. 2

Chief, Oper Rev Div IMaSter File 5