1、_i . . MIL-M-45986 (AR) AMENDMENT 3 22 OCTOBER 1984 SUPERSEDING AMENDMENT 2 10 May 1982 MILITARY SPEC I FI CATI ON MECHANISM, RECOIL, 155MM HOWITZER: M45 This amendment forms a part of Military Specification MIL-M-45986 (WC), dated 15 February 1977, and is approved for use by the US Army Armament Mu
2、nitions and Chemical Command, and is available for use by all Departments and Agencies of the Department of Defense. PAGE 6 * 3.2.6.1 Torque, threaded fasteners: Delete the table and insert the following new table: “Thread Size Torque NO. 4-48UNF 6-8 in-lb NO. 6-32UNC 7-9 in-lb NO. 8-32UNC 14-17 in-
3、lb NO. 10-24uNC 20-25 in-lb NO. 10-32UNF 20-25 in-lb .250-20uNC 70-80 in-lb .375-16UNC 20-24 ft-lb .500- 13UNC 50-60 ft-lb .625-llUNC 90-119 ft-lb“ 3.3.2 Function firing: Delete in its entirety and substitute: “3.3.2 Function firing. The recoil mechanism shall withstand the function firing test (pow
4、der gymnastication) as specified in 4.6.1 without evidence of malfunction or failure and shall meet the criteria of 3.3.2.1 through 3.3.2.5. After function firing, the recoil mechanism shall meet requirements specified in 3.3.3 through 3.3.7. FSC 1025 1 of 4 Obtained From GLOBAL ENGINEERING DOCUMENT
5、S 2625 So.Hickory St. Santa Ana. CA 92707 (71 4EuO-9870: (8001854-71 79 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-45986 (3) 9999906 1976653 O29 = MIL-M-45986 (AR) AMENDMENT 3 3.3.2.1 Long recoil length. Maximum long recoil length shall no
6、t exceed 71 inches. 3.3.2.2 Short recoil length. Maximum short recoil length shall not exceed 50 inches. 3.3.2.3 Cycle time. Recoil cycle time shall not be less than 2 seconds and not more than 4 seconds. 3.3.2.4 Terminal velocity. At a distance of 2 inches from battery position, the counter recoil
7、terminal velocity shall not exceed 4 inches/seconds. 3.3.2.5 Rod pull curves. The actual rod curves shall meet the following requirements: (see Figure 1) Range 1: Peak rod pull shall occur within the first 20 milliseconds for long recoil and 60 milliseconds for short recoil. Range 2: Within 280 mili
8、seconds for long recoil or 180 miliseconds for short recoil, the continuous rod pull curve shall not exceed the peak rod pull of range 1. Range 3: After Range 2, the rod pull curve shall be continuously declining to the end of the recoil cycle. Range 4: Counter recoil cycle. See paragraph 3.3.2.4.“
9、4.6.1 Function firing test: Delete in its entirety and substitute: “4.6.1 Function firing test. Each recoil mechanism shall be subjected to the powder gymnastication test as specified in Table IV. All testing shall be done on a test stand at zero degrees elevation with the variable recoil locked for
10、 long recoil or short recoil, as specified. The tabulated sequence must be followed. Charges shall be varied as required to meet the stated rod pull requirements and shall impart an impulse of at least 10,000 pounds-seconds to at least one long recoil test mode and the short recoil test mode. If any
11、 of the requirements of paragraphs 3.3.2.1 through 3.3.2.5 are not met, the recoil mechanism shall be rejected. Upon completion of this test, the recoil mechanism shall be subjected to the tests specified in paragraphs 4.6.2 through 4.6.7. 2 Provided by IHSNot for ResaleNo reproduction or networking
12、 permitted without license from IHS-,-,-MIL-M-457b (3) 999990b L7bb54 Tb5 Mi L-H-45986 (AR) AMENDMENT 3 A C On .- u -0 v)L CP) QLL; L Y .- .- W hlm - - a O dl -4- Y O C VI o O U U .- In Q UI o c v) Q c u - ul O C U m - al y. I O U U C C .- w r U n .- X 3 P) v) (D O P) 00 L cv o P) U z W L O al m m a
13、l L U C O Y U .- c : c O (u - al Y O O z al u o - - .- o al L al L u rc O U C al al r: u O P) m C (II L v) r U C o, C v) Q 8 L o al U v) U .- .- .- c a 2 o C U C .- P) n u v) E al U m L U c c 3 Q U O cv al Y O 3 4. al o, C (o - Provided by IHSNot for ResaleNo reproduction or networking permitted wit
14、hout license from IHS-,-,-MIL-M-4598b (3) 999990b 197bb55 9TL MIL-M-45986 (AR) AMENDMENT 3 Seauence # 1 2 3 4 Table IV Function Firina Total Fiequi red Variable Recoil Setting Rod Pulis7 Long Recoil Warmer Long Recoil Max. Rod Pull Short Recoil (Total of both Long Recoil recoil rods) shall not excee
15、d 82,000 pound-force. PAGE 16 Delete and add new paragraph as follows: “6.3 One (1) copy of the firing report, which shall include variable data received by this specification and a disitized computer plot of rod pull versus time for at least the first 300 milliseconds of the recoil cycle, shall be
16、sent to AMSMC-QAR-Q (D) and SMCAR-LCW-A, AMCCOM, Dover, NJ 07801 for informational purposes. I Delete original Figure 1 and substitute new Figure 1. NOTE: The margins of this amendment are marked with an asterisk to indicate where changes (additions, modifications, deletions, corrections) from the p
17、revious amendment were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned .to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous amendment. Custodian: A rmy-AR Preparing Activity: Army-AR (Project 1025-Al41 ) U S. GOVERNMENT PRINTING OFFICE. 1984 - 505-038/20151 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
