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)
AA-44-1666
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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