1、. 29 mi1969 SUPERSEDING , Amendment 1 21 April 1$9 MILITARY SPECIEIC;ATION %ROJXCTU;E3 105MM, SMOKF, BE; M843i METAL PARTS ASSEMLY This amendment forms a part of Military Specification MIL-P-l4839(MU) dated 9 February 1968, Paragraph 3.2 Line 2 delete “projectile body“ and substitute “any component
2、part“ Line 3 delete “projectile body“ and substitute “component“ . * Paragraph 3.2.1 Delete in its entirety and substitute: “3.2.1 Body and base plug.-Mechanical properties specified on the applicable drawing shall apply throughout each component in the lot, Paragraph 3.3.1 Line 1 delete “Projectile
3、 body.-“ and substitute “Body and base plug.-“ Line 2 delete “throughout the projectile body“. * Add Paragraph 4.3.1,6 “4.3.1.6 Bar stock lots.-Bsk stock lots shall contain not more than one heat of steel. Bar stock lots thus constituted shallbe the basis for the selection of samples for the tension
4、 test hereinafter prescribed.“ ,- * ParagraFh 4.3.2.2 Under MAJOR i14 after %ase plug cavity“ add “max.“ Under MINOR delete 214 in its entirety and substitute: Gage Diameter of chamfer at rear of small cavity - - - - - - - MINOR 216 delete in its entirety and substitute: . Presence of nose thread ch
5、amfer . I “214. 11216. , - - - - - - - - - - - - - Visual * Paragraph 4.3.2.3 Under MAJOR add: (See 6.i)lf . “107c Front face not perpendicular to surface forward of thread- Gage I 108. Length from front face to start of thread - - - - - - - - Gage“ -* -_ * Paragraph 4.3.2.6 Under MAJOR add: and cha
6、nge numbers accordingly. :- - . . _ - “108, Diameter of rotating band - - - - - - - - - - - - - - - - Gage“ Visual“ Under MINOR add: “206. paint on rotating band bearing surface - - - - - - - - - - Paiagraph 4 . 3 . 3.1 . 2.5 Add the following new paragraph : “4.3.3.1.2.5 Base plug.-Two base plugs f
7、rom each lot shall be subjected to the tension test to determine compliance with the mechanical properties requirements ofthe applicable drawing. Failure of any tension test specimen to compiy with the requirements for yield strength, tensile strength or elon- gation shall be cause for rejectisn of
8、the lot.“ * Paragraph 4.3.3.1.2.5 Line 4 delete “tensile strength“. 7 -7 THIS DOCUMENT CONTAINS PACFC. FSC 1315 . u-“. . -. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-* Add Paragraph 4.3.3.1.2.5.1: “4.3.3.1.2.5.1 Machined from bar stock.-With th
9、e approval of the procuring activity when the base plug is machined from bar stock in such a manner that the mechanical properties are not altered, test coupons approximately 6 inches in length may be removed from one end of each of three bars representing the heat lot and tested in lieu of testing
10、the component. test specimen to comply with the yield strength and elongation requirements of the applicable component drawing shall be cause for rejection of the bar stock lot,“ Failure of one or more tension * Paragraph 4.4.1.2.3 Delete paragraph added by previous amendment in its entirety apd sub
11、stitute: 114.4.1.2.3 Base plugs.-From each sample supplied in accordance with - 4.3.3.1.2.5,- two tension test specimens conforming to the largest obtainable “RI ty-pe specimen as prescribed by Federal Standard No. i51 shall be taken in a transverse direction. The criteria for determining yield stre
12、ngth and elon- . . gation shall be as prescribed by Federal Standard No. 151. Yield strength shall be determined by the offset method, the limiting set shall be 0.1 percent (0.001 inch per inch of gage length).“ . * Add Paragraph 4.4.1.2.3.1: Il 4.4.1.2.3.1 Bar stock.-Fram the samples supplied by 4.
13、3.3.1.1.4, one type ?It tension test specimen shall be taken longitudinally from midradius of eachcoupon, and tested in accordance with the criteria for determining yield strength and elongation as specified by Federal Standard No. 151; s?sU. be determined by the offset method, the limiting set shal
14、l be 0.1 percent (0,001 inch per inch of gage length) .I Paragraph 4.4.4 Lines 4 and 5 delete “salt spray test - No. 141.“ Yield strength * * * Add Paragraph 4.4.4.1: . “4.4.4.1 Salt spray.-Frm the samples provided in accordance with 4.3.3.3 two ful length specjmens shall be taken by cutting longitu
15、dinally through the projectile at mid-diameter. the test cabinet in such a manner that on one specimen the inside surface will be designated as the significant surface, on the other specimen the outside surface will be the significant surface. the equipent and procedures prescribed by Federal Test M
16、ethod Standard No. 141.“ The specimens shall be positioned in The test shall be performed utilizing * The margins of this amendment are marked with an asterisk to indicate where changes (additions, modifications, corrections, deletions) from the previous issue were made. no liability whatsoever for
17、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-issue. This was Gore as a convenience only and the Government assumes Preparing activity Custodian : Army - Mu AT - iW Project No. 1315-A70& p 2 a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
