1、 MIL-DTL-45500E = 9999906 2030946 271 I INCH-POUND I MIL-DTL-45500E 18 December 1996 SUPERSEDING MIL-G-455OOD 30 July 1994 DETAIL SPECIFICATION GUN, AUTOMATIC, 20MM, GENERAL SPECIFICATION FOR This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOP
2、E 1.1 Scope. This specification covers the general requirements for multi-barrel, electrically fired, 20 millimeter (mm) automatic guns. Additional requirements for specific models of the 20mm automatic gun are on specification sheets which are included as a part of this specification. 2. APPLICABLE
3、 DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, and 5 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made t
4、o ensure the completeness of this list, document users are cautioned that they must meet all requirements documents cited in sections 3, 4, and 5 of this specification, whether or not they are listed. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of
5、use in improving this document, should be addressed to: Commander, U.S. Army ARDEC, ATTN: AMSTA-AR-EDE-S, Picatinny Arsenal, New Jersey 07806-5000 by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 1005 DISTRIBUT
6、ION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-DTL-45500E 9999906 2030947 108 m * MIL-DTL-45 5 OOE U 2.2 Government documents. 2.2.1 Specifications, standards, and handboo
7、ks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement t
8、hereto, cited in the solicitation (see 6.2). SPECIFICATIONS DEPARTMENT OF DEFENSE MIL-W-13855 Weapons: Small Arms and Aircraft Armament Subsystems, General Specification For MIL-P-14232 Parts, Equipment and Tools for Army Materiel, Packaging Of (Unless otherwise indicated, copies of the above specif
9、ications, standards, and handbooks are available from DODSSP - Customer Service, Standardization Documents Order Desk, 700 Robbins Avenue, Bldg. 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and pub
10、lications form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation. DRAWINGS F7273689 Gage, Flush Pin C7797 956 Gage, Boresight Drawings applicable to the individual 20mm Automatic Gun will be as specified in the applicab
11、le specification sheets. (Copies of other Government documents, drawings, and publications required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting activity.) 2.3 Non-Government publications. The foll
12、owing documents form a part of this document to the extent specified herein. Unless 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-DTL-qSSOOE M 9999906 2030948 O44 MIL-DTL-45 5 OOE otherwise specified, the issues of the documents which are Do
13、D adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of docu- ments not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN NATIONAL STANDARDS INSTITUTE/ AMERICAN SOCIETY FOR QUALITY CON
14、TROL ANSI/ASQC 21.4 Sampling Procedures and Tables for Inspection by Attributes ANSI/ASQC A8402 Quality Management and Quality Assurance Vocabulary (Application for copies should be addressed to the American Society for Quality Control, 611 East Wisconsin Avenue, P.O. Box 3005, Milwaukee, Wisconsin
15、53201-1734) 2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
16、(See contract provisions for additional precedence criteria). 3. REQUIREMENTS 3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the applicable specification sheet. between the requirements of this specification and the specifi- cation shee
17、t, the latter shall govern. In the event of any conflict 3.2 First article. Requirements for submission of the first article shall be as specified in the contract (see 6.1). Unless otherwise specified (see 6.2), the first article (see 4.4) shall include the pilot pack (see 6.2). 3.3 Material, constr
18、uction and design. Guns shall conform to the material, construction and design requirements specified herein, those specified in MIL-W-13855, and those specified on drawings referenced in applicable specification sheets. 3.3.1 Barrels. Finished barrels, or slave barrels (for guns procured without ba
19、rrels), when assembled to the rotor and housing, and fitted with barrel clamps shall meet the targeting and accuracy requirements specified herein. The barrels shall 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-45500E 997790b 2030949 TBO
20、 = MIL-DTL-45500E assemble and disassemble from the rotor assembly without the use of tools. 3.3.1.1 New barrels. New barrels shall be free of cracks, seams, and mutilations. The bore and chamber shall be free of foreign matter, corrosion, pits, burrs, sharp edges, bulges and deformations. The chrom
21、ium plating in the chamber and bore shall be free of nodules, anode burns, flaking and stripping. Scratches or marks in the chamber which meet the surface roughness require- ments shall be permitted provided they do not cause marks on the case of a high pressure test cartridge fired in the chamber.
22、New barrels shall be marked for proof firing and magnetic particle inspection in accordance with applicable drawings. 3.3.2 Barrel clamps. Unless the gun is procured without barrels the barrel clamps shall be fastened securely to the barrels as specified on the applicable drawing. 3.3.3 Breech bolt
23、assemblies. The breech bolt assemblies shall be marked in accordance with the applicable drawings after being proof fired and magnetic particle inspected. The breech bolt assemblies shall move without binding on the trackways of the rotor. The roller, shaft, locking block, firing pin cam, and the fi
24、ring pin shall be retained in the breech bolt body and shall move without binding. The firing cam pin insulator and the firing pin insulator assembly shall be retained in the breech bolt body. When the shaft assembly is depressed, the locking block shall move into the lock position and shall allow t
25、he firing pin cam to be fully depressed. depressed, it shall move the firing pin forward. When the shaft assembly is raised, the locking block shall move to the unlocked position, the firing pin cam shall return to its original posi- tion, and the firing pin shall retract into the breech bolt body.
26、When the firing pin cam is 3.3.4 Cams, locking and unlocking. The locking cam and front and rear unlocking cams shall be positioned and securely fastened to the housing assembly in accordance with the applicable drawings. 3.3.5 Clearing sector assembly. The clearing sector assemblv shall be retained
27、 on the housing assembly by the spring pin and-shall function through its full range of travel without binding. clearing position and the rotor is manually rotated in the direction of the arrow, the breech bolt assemblies shall enter the clearing track of the housing without sticking or binding. Whe
28、n the clearing sector assembly is released out of clearing position by its return spring and the rotor is rotated, the breech bolt assemblies shall enter the main cam of the housing without sticking or binding. This is applicable to all guns When the clearing sector is manually moved into 4 Provided
29、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-45500E m 9999906 2030963 588 m b MIL-DTL-45500E except the M197 and M197E1 gun, which does not have a clearing sector. 3.3.6 End plate. The end plate shall be positioned by dowel pins and retained on th
30、e housing by the coupling clamp. There shall be no relative movement of these parts. 3.3.7 Firing contact assembly. The firing contact assembly including conductors and insulators shall be securely fastened to the housing in accordance with the applicable drawing. 3.3.8 Guide bar. The guide bar shal
31、l be retained on the housing assembly by spring pins. 3.3.9 Housing assembly. The bolts securing the two housing halves shall be torqued as specified on the applicable drawings. The roller guide shall be securely fastened to the housing as specified on the applicable drawings and shall allow free mo
32、vement after the rotor and bolts are installed. There shall be no interference with bolt assemblies cycling in clearing cam tracks. 3.3.10 Housing cover assembly. The housing cover assembly shall be retained on the housing assembly by the cover lock pins. The hinged housing cover shall move through
33、its full range of travel when opened from either side. This requirement is not applicable to M197 and M197E1 Guns 3.3.11 Indexing pin assembly. The indexing pin assembly shall be assembled to the housing assembly and lock wired. The indexing pin shall move through its full range of travel without bi
34、nding when manually depressed, and shall return and be held in the extended position by spring action after positioning the barrels. 3.3.12 Recoil adapters. The recoil adapters shall be fastened securely to the retainer assembly except for M61A1 and M61A2 guns which incorporate an Automatic gun reco
35、il mechanism with integral mountings for the recoil spindle assemblies. The recoil adapters, or recoil mechanism shall provide controlled fore-aft deflection of the gun so as to reduce firing loads transmitted to the gun mounts. Spring rates and dampening of the recoil adapters spindles shall be as
36、specified on applicable drawings. The spindle retainer shall be finger tightened to remove end play of the spindle assembly in the housing and lock wired. This requirement is not applicable to M197 and M197E1 Guns. 3.3.13 Bearing retainer assembly/automatic gun recoil mechanism. The bearina retainer
37、 assembly or automatic gun recoil 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-45500E 999990b 2030962 414 MIL-DTL-45500E mechanism (M61A1 and M61A2 guns) shall be securely fastened to the housing assembly as specified on the applicable d
38、rawing. 3.3.14 Rotor assembly. The rotor shall be proof tested and magnetic particle inspection marked and serial marked in accordance with the applicable drawings. The rotor gear, rotor assembly, rear well springs and plate, and the front and center bolt-tracks shall be fastened securely to the rot
39、or body as specified on the applicable drawing. There shall be no relative movement of these parts. The rear bolt tracks shall assemble to the rotor body in accordance with the applicable drawing, and disassemble from the rotor body without the use of tools, except for a probe to depress the lock pi
40、n. The track lock pins shall move through their full range of travel without binding, and shall be returned to, and held in, the extended position by spring action to retain the rear bolt tracks in the locked position on the rotor body. 3.4 Performance characteristics. 3.4.1 Firing pin protrusion an
41、d continuity. With the rotor manually rotated until the firing pin cam is fully depressed and the firing pin protrudes through the bolt face, firing pin protrusion of each bolt assembly shall be .O33 inches minimum. With the locking block in the unlocked position and firing cam pin fully depressed a
42、gainst block, the firing pin shall not protrude beyond the face of the bolt. With the locking block in the locked position (down 15O 30) and the cam pin depressed until the firing pin extends .O28 to .O30 inches, there shall be electrical continuity between the cam pin and the firing pin when 1.5 ma
43、ximum voltage is applied. Testing shall be as specified in 4.5.3.2. 3.4.2 Head space. The head space in the assembled gun shall be not less than 3.467 inches nor more than 3.488 inches when measured to the 0.942 inch diameter datum on the first shoulder of the chamber. Testing shall be as specified
44、in 4.5.3.2. 3.4.3 High pressure resistance. Guns shall be capable of withstanding the firing of one round of Government standard 20m, M54A1 high pressure test cartridge in each barrel. Parts shall be free of cracks, seams and other injurious defects after proof firing. Testing shall be as specified
45、in 4.5.3.3 3.4.4 Functioning. Guns shall operate without malfunctions, except that one misfire shall be allowed in each 75/100 rounds fired and no parts becoming unserviceable. Guns shall meet the functioning requirements specified herein, and as specified in the applicable specification sheet. Unle
46、ss other- 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-45500E 99Ob 2030963 350 . MIL-DTL-45500E wise specified herein, the steady state rate of fire shall be calculated using the last fifty percent of the burst excluding stopping time. A
47、mmunition used for the function firing shall be Government Standard 20m, M55A2 cartridges and 20m, M51 series or PGU-39/B dummy cartridges. Testing shall be as specified in 4.5.3.3 3.4.4.1 Clearing. The gun shall be capable of being cleared when the clearing sector is manually pivoted into the main
48、cam and the rotor assembly is manually turned by hand to load and clear a minimum of five rounds of Government Standard 20m, M51 series or PGU-39/B dummy cartridges. 3.4.5 Targeting and accuracy. Using Government standard 20m, M55A2 cartridges, the targeting and accuracy requirements shall be as spe
49、cified in the applicable specification sheet. Testing shall be as specified in 4.5.3.3. 3.4.6 Endurance. Requirement for endurance testing shall be as specified in the contract (see 6.2). Guns shall be capable of withstanding the firing of 25,000 or 30,000 rounds, (as specified in the applicable specification sheet), of Government standard 20m, M55A2 cartridges, with no misfires exceeding 0.5 percent of each series attributable to the gun, and
