1、Mi-N-21945A(OS) 21 February 1973 SUPERSEDING MIL-N-Z1945(Wep) 27 February 1959 MILITARY SPECIFICATION Nonmagnetic Requirements For Parts for Mines Mark 56 and Mark 57 1. SCOPE 1.1 This specification establishes the nonmagnetic requirements for procurement of parts (see 2.1) for the Mines Mark 56 and
2、 Mark 57. 2. APPLICABLE DOCUMENTS 2.1 The following standards, drawings and pub1 ications, or such portions thereof as desiqnated herein of the issue in effect on the date of invitation for bids, STANDARDS MILITARY MIL-STD-105 MIL-STD-481 DRAW I NGS NAVAL ORDNANCE SYSTEMS COMMAND Dwg. 1186570 Dwg. 1
3、186571 Dwg. 1191746 Dwg. 1246626 Dwg. 1274625 Dwg. 1299387 Dwg. 1378573 Dwg. 1379182 Dwg. 1386214 form a part of this specification. Sampling Procedures and Tables for Inspection by Attributes Configuration Control -Engineering Changes , Deviations and Waivers (Short Form) Ring Shackle stop Cover, L
4、oading Hole Strap Spacer Ring, Clamp Magnetometer Housing Mark 1 Mod O As sembl y Spacer Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-2 1945A(OS) Dwg. 1387843 Dwg. 1387988 Dwg. 1418167 Dwg. 1418168 Dwg. 1553572 Dwg. 1553573 Dwg. 1619172 Dwg.
5、 1620227 Dwg. 1620253 Dwg. 1620254 Dwg. 1620660 Dwg. 1634067 Dwg. 1634068 Dwg. 1635006 Dwg. 1700974 Dwg. 1700998 Dwg. 1738313 Dwg. 1738318 Dwg. 1825736 Dwg. 1826627 Dwg. 1826628 Dwg. 1826629 Dwg. 1826630 Dwg. 1827674 Dwg. 1827675 Dwg. 1827687 Dwg. 2155262 Dwg. 2280626 Dwg. 2289340 Dwg. 2420946 Dwg.
6、2422431 Dwg. 2422446 Dwg. 2423304 Dwg. 2426520 Dwg. 2491852 PUBLICATIONS NAVAL ORDNANCE SYSTEMS COMMAND OD 10511 Spacer Strap Spacer Spacer Shear Tube Cage We1 dment Nut Fuze Weight Weight Nut Nut , Hex , Machine Screw Washer, Flat Shear Tu be Loc kwas her Was her Cap, Screw, Socket Head Screw, Slot
7、ted, Pan Head Coupling Nut Screw, Slotted Pan Head Screw, Machine, Flat Head Retaining Ring, E Type Retaining Ring Nut, Hex, Self Locking Screw, Cap Bolt, Hex Head Spacer Spacer Spring Pin Filter, Radio Interference, Mark 4 Mod O Filter, Radio Interference, Mark 3 Mod O Capacitor, Fixed , Mylar-Diel
8、ectric Support Retainer Assembly Arming Wire Mark 5 Mod 1 Basic Methods for Nonmagnetic Testina with the Test Set Mark 115 Type (Copies of standards, drawings and pub1 ications required by contractors in connection with specific procurement functions should be obtained from the procuring agency or a
9、s directed by the contracting officer. ) 2 - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ - flIL-N-239LiSA 33 W 9799706 0303837 3 W 3. REQU I REMENTS 3.1 Description. This specification lists those parts for the Mines Mark 56 and 57 which shall
10、be subjected to magnetic effects tests when procured separately. 3.2 General requirements . 3.2.1 Requests for deviation. Requests for deviation from this specification, applicable drawings, standards, pub ications, materials and processes specified herein, shall be as set forth in MIL-STD-481. 3.2.
11、2 Conflicting requirements. Conflicting requirements arising between this specification or any standard, pub1 ication or drawing listed herein shall be referred in writing to the procuring agency or appointed agent for interpretation and clarification. 3.3 3.3.1 Static magnetic effect. When tested i
12、n accordance Performance requirements and product characteristics, with 4.5.2, the static magnetic effect of the parts as tested shall not exceed 0.10 milligauss when measured as described in OD 10511. 4, QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in t
13、he contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspection requirements
14、specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.2 Classification of inspections
15、. The inspection and testing of the spare and special parts shall be classified as fol 1 ows : a. b. c. First article inspection (paragraph 4.5) Qual i ty conformance inspection (paragraph 4.5) Periodic production sample inspection (paragraph 4.5) 4.3 Inspection. 4.3.1 First article inspection-. The
16、 first article sample of the item being procured shall be tested by the contractor, or an , Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-activity designated by the procuring agency, to determine that it meets the requirements of this specification
17、. 4.3.2 Quality conformance. 4.3.2.1 Sampling. Acceptance samples selected from the production lot for testing by the contractor or a Government-designated testing activity shall be randomly selected in accordance with MIL- STD-105, Inspection Level II, AQL 1.0 percent or as designated on the specif
18、ication or drawing for the particular part. In the event of a conflict between the AQL specified herein and the specification or drawing for the particular part, the specification or drawing shall have precedence. 4.3.2.2 100 percent inspection. Unless otherwise specified, inspection shall be perfor
19、med 100 percent only on those items where 100 percent inspection is required by the appi icable specification or drawing . 4.3.3 Periodic production sample test. When specified, a periodic production sample of the applicable item shall be randomly selected from the production lot for submission to a
20、n activity designated by the procuring agency to determine if the item meets the requirements of this specification. Nonperformance of this test by the contractor does not relieve the contractor from the responsibility of meeting the requirements of this specification. 4.4 Test equipment. The follow
21、ing item of test equipment is required to perform the test of 4.5: Test Set Mark 115 (Government furni shed) 4.5 Tests. 4.5.1 General test conditions and definitions. The general test conditions and definitions shall be as specified in OD 10511. 4.5.2 Test procedure. Static magnetic effect tests sha
22、ll be accomplished as specified in OD 10511, Test Method I. purpose of accomplishing the tests, the test distance and the rate of rotation shall be as specified in Table I or II for each category of parts to be tested. for large aluminum or copper parts, especially if these parts are cylindrical or
23、spherical , to prevent the production of magnetic eddy current effects. A smooth, continuous rotation is required for such parts; avoid abrupt motions. For the Note that the rate of rotation must be slow 4.5.2.1 Small parts. Small parts to be tested shall be arranged in a compact manner in a volume
24、whose base area shall not exceed 3 inches square and whose height shall not exceed 1-1/2 inches. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-c MIL-N-21745A 13 - 7777706 030117 7 I The parts shall be secured in this volume to insure no relative mo
25、vement during testing. be tightly packed in a suitable nonmagnetic container or can be secured together with cord or tape. Table I specifies the minimum quantity of parts that shall be tested at one time. If the quantity on hand is less than the minimum specified, approval must be obtained from the
26、procuring agency before beginning nonmagnetic tests. of the testing activity, a quantity greater than the minimum specified may be tested at one time; however, the static magnetic effect of such a quantity shall not exceed 0.10 milligauss. In order to meet these conditions, the parts can At the disc
27、retion 4.5.2.1.1 The test face for the small parts to be tested shall be the base area of the grouped parts. 1-3/4 51/16 inches from the center of the test magnetometer to the test face. A convenient method of maintaining this test distance during testing is by the use of a 1/4-inch thick, flat, non
28、magnetic spacer 3 inches square secured either to the appropriate faces of the magnetometer or to the base area of the grouped parts. The test axis shall be the line perpendicular to and passing through the center of the base area of the grouped parts. In testing, the test face shall be held at the
29、test distance in each of the three orientations specified in OD 10511. The test distance shall be 4.5.2.2 Large parts. Table II specifies the minimum quantity that must be tested and the maximum that may be tested at the discretion of the testing activity. the parts shall be secured together to prev
30、ent shifting or movement of the parts during the test. When more than a single item is tested, 4.5.2.2.1 The test face for the large parts to be tested shall be either one of the larger area faces of the test material. test distance from the magnetometer center to the test face is specified in Table
31、 II. The test axis shall be perpendicular to the test face and shall pass through the center of mass of the part. In testing, the test face shall be at the test distance from the test magnetometer in each of the three orientations in OD 10511. The 4.5.2.3 Magnetometer Housing Mark 1 Mod O. The magne
32、tic testing of the Magnetometer Housing Mark 1 Mod O shall be conducted in accordance with OD 10511, Test Method 1, with each of the six sides of the magnetometer housing considered as a test face and tested accordingly. The test distance from the center of the magnetometer to the face being tested
33、shall be 1-3/4 2 1/16 inches. The four faces of the magnetometer housing perpendicular to the mounting flange shall be presented to the test magnetometer by placing the extending edge of the mounting flange at the prescribed test distance with the face under test parallel to the adjacent test magnet
34、ometer face. The magnetometer housing shall be substantially centered with respect to the test magnetometer during each of the 18 test presentations. The rate of rotation for Orientation C shall be 8 to 15 seconds per revol u ti on. 7 5 ,/ - (I ., Provided by IHSNot for ResaleNo reproduction or netw
35、orking permitted without license from IHS-,-,-4.5.2.4 Arming Wire, Mark 5 Mod 1. The magnetic testing of the Arming Wire Mark 5 Mod 1 shall be conducted in three test cvcles as shown in 4.5.2.4.1, disregarding provisions of 4.5.2. cycle shall consist of the following parts: Indicate sign and value o
36、f signals on the recorded tapes. (any position sufficiently removed from the magnetometer where the magnetic signal is less than 0.01 milligauss) for a minimum of three seconds. Each tesi (1) Calibrate signals “+“ and of suitable magnitude. (2) Hold the test object at the reference position (3) Brin
37、g the test object to the test position (see 4.5.2.4.1) and move as directed. (4) and hold for a minimum of three seconds. Remove the test object to the reference position (5) Calibrate signal I+“ and I- of suitable magnitude. Indicate value of signals on the recorded tapes. 4.5.2.4.1 Motion for test
38、 cycles. The motion required for each of the three test cycles is described as follows: Motion for Test Cycle 1. Beginning at one end of the inner packing container which holds 50 arming wires, the package shall be moved longitudinally and tangentially along the face of the magnetometer marked “TOP“
39、 at a speed of 2 to 6 inches per second. (Under these conditions, the metal will not come closer to the face of the magnetometer than 1/2 inch due to the thickness of the packaging material . ) Motion for Test Cycle 2. With the container held parallel to the background field and beginning at one end
40、, the package shall be passed along the side of the magnetometer for approximately one half of its length at the same speed as previously mentioned, of the length of the package, only one half can be conveniently tested at a time.) (Because Motion for Test Cycle 3. By turning the package In the even
41、t that a reading endwi.se, the motion for Test Cycle 2 may be continued to test the entire length of the package. (Note. greater than 0.10 milligauss is obtained, the bundle of long sections should be removed from the inner container and retested while maintaining the same spacing distance, 1/2 inch
42、 from the magnetometer, since magnetic test is not specifically required on the short sections.) peak for any test cycle except as explained in note above shall be cause for rejection. 4.5.2.4.2 A reading in excess of 0.10 milligauss peak-to- Provided by IHSNot for ResaleNo reproduction or networkin
43、g permitted without license from IHS-,-,-MIL-N-ZL945A 13 9999906 030L2L 5 4.5.3 Acceptance criteria. Any part which fails to meet the product characteristics requirement of this specification shall be regarded as defective. 5. PREPARATION FOR DELIVERY (Not appl icable) 6. NOTES 6.1 Intended use. Thi
44、s specification establishes the magnetic effects test requirements for nonmagnetic parts used in the Mines Mark 56 and 57 when tested with the Test Set Mark 115 in accordance with OD 10511. 6.2 Ordering data. Procurement documents should specify the 6.2.1 Procurement reauirements. following: a. b. E
45、xceptions to this specification. c. Applicable d.riwings and other documents. Title, number and ate of this specification. 6.2.2 Contract data requirements. Test reports associated with any of the tests covered in paragraph 4.5 of this specification will be prepared and delivered by the contractor o
46、nly when they are i$ste on a Contract Data Requirements List (DD Form 1423) incorporated into the contract. in accordance with the following Data Item Description (DID) cited bv number in Block 4 of the DD Form 1423: In. those instances ,. the reports shall he pxqarec! DID No. DI-T-2072 Preparing Ac
47、tivity Navy - OS Title Report, Test Project No. 1350-NO2 7 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-N-21745A 13 U 7977706 0301822 7 a MIL-N- 2 1945A( OS) TABLE I Rate of Rotation Min. Test Drawing Name Quantity in Sec./Rev. 138621 4 161
48、 91 72 1620227 1620660 1634067-1 1 1634067-1 2 1 634067 -1 3 1634067 -1 4 1634067-1 5 1634068-7 1634068-1 2 1634068-1 4 1634068-18 1700974-4 1700974-5 1700974-6 1700974-7 1700974-8 1700974-9 1700974-1 O 173831 3-23 1738313-34 1738313-46 1738313-47 173831 3-52 173831 3-53 1738313-56 173831 3-62 17383
49、1 3-64 173831 3-77 173831 3-97 173831 8-61 173831 8-62 173931 8-64 1826627-77 1826627-79 1826628-68 1826629-1 57 1826630-77 1827674-292 1700998 1825736 Spacer Nut Fuze Nut Hex Nut Hex Nut Hex Nut Hex Nut Hex Nut Washer Flat Washer F1 at Washer Flat Washer L oc k :ia s h er Lock Washer Lock Washer Lock Washer Lock Washer Lock Washer Lock Washer Was her Soc. Hd. Cap Screw Soc. Hd. Cap Screw Soc. Hd. Cap Screw Soc. Hd. Cap Screw Soc. H
