1、*= . t. MILITARY 2s PECIF I g.l 4.6.4.9 3.9.2 4.6.4.10 3.9.3 4.6.4.11 3.10.1 4.6.4.12 .3.10.2 4.6.4.12 . 3.10.3 4i6.4.12 3.11.1, 4.6.5, 4.6.5.1 3.11.1.1 3.11.1, 4.6.5, 4.6.5.2 3.11.1.2 MINOR: 2.5% Defective 201, Mount locking latch (operahility) 3.11.2 4.6.6 202. Locking knobs (operability 203. Azim
2、uth slip scales (operability) 204. Torque (operability) 3.11.3 4.6.7 3.11.4 4.6.8 3.11.5 4.6.9 NOTE: temperature of between 60“ and 90F. The tests in Table II shall be conducted at a standard ambient 4.3.3 Acceptance and rejection.- Rejected-lots shall be screened for all defective characteristics.
3、and resubmittance of rejected lots shall be in accordance with “Acceptance and Rejection“ as specified in MIL-STD-105. Removal or correction of defective units 4.4 Special sampling. 4.4.1 General.- Three mounts shall be selected at random as a special sampling from each 100 produced. and tests in Ta
4、ble III. The samples shall meet the requirements Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-5 03 80 (MU) MIL-M-50380 12 m 9937706 032b8bb 7 TABLE IIL REQUIREMENTS TE ST PROCEDURES A NO CHARACTERISTICS 301. Fabrication 3.1 . . Drawings-Visu
5、al 302. General specification 3.2 MIL-F-13926-Visual NOTE: “he examinations in Table III shall be conducted at a standard ambient temperature of between 60“and 9OOP. 4.4.2 Environmental tests. - Three telescope mounts shall be selected at random from each 50 produced, or from each months production,
6、 whichever occurs first, and test in Table IV and shall then meet the requirements for Characteristics 116, 117, 118, 201, 202, 203 and 204, Each sample shall meet the requirement TABLE IV - NO. CHARACTERISTICS . REQUIREMENTS TEST PROCEDURES 303. Low temperature operation.(-4O0F) 3.3.1, 3.11 4.6.1 3
7、04. High temperature operation (+150“F) 3i3.1, 3.11 4.6.1 4.4.3 Failure of sample,- Should any item of a special sampling fail to meet the specified test requirements, acceptance of the product will be suspended by the Government until necessary corrections have been made by the contractor and the r
8、esubmitted samples havebeen approved (see 4.3.3). 4.5 Inspection equipment.- Except as otherwise provided for by the contract, the contractor shall supply and maintain inspection equipment in accordance with the applicable requirements of MIL-1-45607. - 4.5.1 Government furnished inspection equipmen
9、t.- When the contract provides for Government furnished test equipment, supply and maintenance of test equipment shall be in accordance with the applicable requirements specified in MIL-1-45607. 4.5.2 Contractor furnished inspection equipment. 4.5.2.1 Government design.- Unless otherwise specified i
10、n the contract, all inspection equipment specified by drawing number in specifications or SQAP forming a part of the contract: shall b? supplied by the contractor in accordance with technical data listed ir_ the List of Inspection Docu- ments when provided with the Technical Data Package (TDP). 4.5.
11、2.2 Contractor design.- Ti.- contractor shall provide inspection equipment compatible with the “Test Methods and Procedures“ specified in 4.6 of this Specification and wich the “Component Inspection“ and “Test Facilities“ requirements of MlL-3-13426. Since tolerance of test equip- ment is normally c
12、onsidered to be vithin I.C% of the product tolerance of - - .- - , _- .-. i Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-P s MIL-U-50380 12 W 9449406 0326867 O = MIL-M-5 O380 (Mu) which it is intended, this inherent error in the test equipment des
13、ign must be consideredas part of the prescribed product tolerance limit. Thus, concept, construction, materials, dimensions and tolerances used in the design of test equipmnt shall be so selected and.controlled as to insure that the test equipment will reliably indicate acceptability of a product wh
14、ich does not exceed 90% of the prescribed tolerance limit, and permit positive rejection when noneconformng. Construction shall be such as to facilitate routine calibration of test equipment. 4.5.2.3 Inspection equipment design requirements.- 4.5.2.3.1 Orientation.- Orientation in conformance with t
15、he re- quirements of 3.4.i accomplished by using the elevation and cross leveling testing fixture, Drawing D6523553. shown on Drawing D6510966, shall be assembled to the cross leveling fixture. An auxiliary telescope shall be placed on the VIS, and the both directions in the horizontal plane. shall
16、be sighted on a wall target or in a target collimator by moving the fixture gage assembly. Place the perpendicularity gage, shown on Drawing D7646979, in.the dovetail slot of the fixture gage assembly. Place the auxiliary telescope in the “V“ slot and adjust for zero line of sight in the vertical po
17、sition. The fixture gage assembly, *cross leveling fixture shall be leveled with a 10-second level for The auxiliary telescope 4.5.2.3.2 Wall target.- A calibrated wall target capable of measuring and providing the angular mechanical accuracies of the mount shall be located approximately fifty feet
18、from the elevation and cross leveling fixture. (a) The tsget: shall contain a “O“ horizontal line of sight, with the elevation and depression images positioned in the same vertical plane with the O“ horizontal line of sight. the lines of sight of the elevation and depression target images shall be e
19、stablished in mils at elevation and depression settings of +ZOO, i-1000, -200 and -800. The angular position of (b) The wall target shall contain a calibrated vertical image line (plumb line) for measuring travel accuracy of the elevation test fixture prior to performing accuracy tests of the telesc
20、ope mount. The wall tar- get shall also contain calibrated displacement marks with respect to the vertical image line (plumb line) for measuring plumb travel. Tolerance marks shall be incorporated on both sides of this vertical plumb line to conform with the tolerances specified In 3.6.1 and 3.6.2.
21、(c) The perpendicularity gage shall be positioned in the slot of the elevation fixture that is perpendicular to its axis. A collimating telescope of approximately six-power with a suitable cross line reticle shall be utilized. outside diameter within 10 seconds. Provisions shall be made to permit pl
22、umbing the recicle within 10 seconds and for maintaining this accuracy with respect to the perpendicularity gage and with the target. Positioning the collimating telescope in the Vee slot of the perpendicularity gage will establish a line of sight through thne tel- scape mounting sleeve. The reticle
23、 shall be centered with respect to the #- y. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_. MIL-M-5C380(MU) MIL-N-503O 12 m 730b 032bb 2 m 4.6 Test methods and procedures. - 4.6.1 Extreme operating temperatures.- The mount shall be exposed to t
24、he temperature conditions specified in 3.3.1, utiliz.ing testing equip- ment in accordance with the “Test Facilities“ requirements of MIL-F-13926. The mounts shall be placed in the cold chamber and the temperature of the chamber reduced gradually -40F. Lhe mounts shall remain at this tempera- ture f
25、or a minimum.of 5 hours. and while at -40F the mounts shall be subjected to the tests in 4.6.5 to 4.6.9 inclusive to determine compliance with 3.3.1. of this test the mount temperature shall be gradually raised to room ambient temperature. and the temperature shall be raised gradually to +150F. The
26、mounts shall remain at this temperature for a period of 5 hours and at the con- clusion of this 5 hour period, and while at +150“F, the mounts shall again be subjected to the tests in 4.6.5 to 4.6.9 inclusive to determine compliance with 3.3.1, Upon completion of this test the temperature of the tes
27、t chamber shall be gradually reduced to room ambient temperature (60“ to 90F) at which time the mounts shall be removed from the test chamber. the mounts to thermal shock. At the completion of this 5 hour period, Upon completion The mount shall then be placed into an oven chamber Caution shall be ex
28、ercised during this test to avoid subjecting NOTE: exceed 20F per hour throughout the temperature cycling test of 4.6.1. The rate of temperature change in the test chamber shall not . 4.6.2 Standard ambient temDerature. - The mount shall pass the following tests while thermally stabilized at an ambi
29、ent temperature between +60 and +90“F as specified in 3.3.2 and the “Test Facilities“ of MIL-F-13926. 4.6.3 Vibration.- Standard vibration equipment capable of providing the amplitude and frequency as specified in 3.3.3 shall be utilized for this test. The mount shall be vibrated in a vertical plane
30、, wise specified, the test equipment shall be in conformance with the “Test Facilities“ of MIL-F-13926. Unless other- 4.6.3.1 Post vibration.- Subsequent to vibration the mount shall be throughly examined for physical defects resulting from poor workmanship and material to determine compliance with
31、3.3.3 prior to being subjected to the remaining tests specified herein. 9 visual examination shall be made for missing or damaged parts prior to being subjected to the remaining performance tests. Minimum visual examination shall include the level vials (also use smell tests to detect a leaking vial
32、 resulting from a broken seal or glass), screws, nuts, etc. A tactile examination shall also be conducted to determine looseness or improper functioning of the elevation, azimuth, and angle of site knobs, the clamping mechanism, mounting latch, locking knobs,and azimuth slip scales. possible defects
33、 defined above shall be cause to consider a mount defective. Mounts which have passed the above examinations shall be tested for all other requirements of this specification. Any one of the lo r Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2 MIL-M
34、-50380 12 m 9999906 032bb9 Lt MIL-M-5 0380 (mi) 4.6.4 Orientation.- Perform the following tests with the telescope mount positioned on special testing equipment conforming to 4,5.2.3.1, 4.6.4.1 Telescope elevation mechanism, excursion.-.Use the telescope elevation mechanism knob to elevate and depre
35、ss a minimum of 200 mils from the zero position established in 4.5.2.3.1. collimating telescope, the line of sight of the telescope shall meet the requirements of 3.5.1 as measured on t.he target image. While observing through the 4.6.4.2 Elevation, excursion.- Observe through the collimating telesc
36、ope, wherein the center point of the telescope reticle shall be in coincidence with respect to the intersecting point of the “O“ (horizontal line of sight) and plumb line of the target image. Utilize the elevation knob to elevate the telescope a minimum of 1000 mils. In cases where the plumb line is
37、 not long enough for full excursion, the elevation fixture can compensate for full travel for the test of 3.5.2 by rotating the elevation fixture. The horizontal line of thetelescope reticle shall be in coincidence with respect to the 1000 mil horizontal target image line. From zero position, rotate
38、 the elevation knob to depress the line of sight of the telescope a minimum of 800 mils, The horizontal line of the telescope reticle shall be in coincidence with re-spect to the 800 mil horizontal target image line to ascertain confoping mechanism, operability. - The telescope clamping mechanism is
39、 tested manually for operability at temperatures specified in 3.3.1 and 3.3.2. in 3.11.1 shall be firmly held in all positions when applying the specified torque; using a commercial torque wrench. Upon releasing the clamping mechanism, there shall be free movement in all dikections. When clamped, th
40、e test piece as specified 4.6.5.1 Unlocked position.- When the specified test piece is posi- tioned in the clamping mechanism, it shall rotate freely without drag or interference as specified in 3.11.1.1 It shall meet this requirement when subject to the temperatures specified in 3.3.1 and 3.3.2“. 4
41、.6.5.2 Locked position.- With the specifiedtest piece positioned . in the clamping mechanism as in 4.6.5.1, the clamping mechanism shall be actuated to the locked position. The test piece shall have no move- ment when the specified torque (3.11.1.2) is applied. The clamping mechanism chai1 operate f
42、reely when subjected to temperatures specified in 3.3.1 and 3.3.2“. 4.6.6 Mount locking latch, operability.- The locking latch shall be manually operable while subjected to the temperatures specified in 3.3.1 and 3.3.2 to determine compliance with 3.11.2. 4.6.7 Locking knobs, operability.- Locking a
43、ction of the elevation . and azimuth locking knobs shall be checked at the temperatures specified in 3.3.1 and 3.3.2 for compliance with.the requirements of 3.11.3, utilizing the commercial torque wrench with an adapter. 4.6.8 Azimuth slip scales, operability.- The micrometer and coarse azimuth slip
44、 scales shall be examined by manually slipping the scales while subjected to the temperatures specified in 3.3.1 and 3.3.2 to determine compliance with 3.11.4. 4.6.9 Torque.- This test shall be performed using a commercial type inch-ounce torque wrench with adapters to accommodate the knobs. Reading
45、s taken with the torque wrench shall be taken in both directions and while in motion. The torque required to rotate the knobs as speci- fied in Table I at standard ambient temperature shall not be exceeded by more than the requirement of 3.11.5 when tested at the extreme operating temperatures of 3.
46、3.1. 5. PREPARATION FOR DELIVERY 5.1 Packaging, packing, and marking.- Packaging, packing, and marking shall be in accordance with Packaging Data Sheet 10559699. level of protection shall be as specified in the procurement document. (see 6.2) The 6. NOTES 13 Provided by IHSNot for ResaleNo reproduct
47、ion or networking permitted without license from IHS-,-,-6.1 Intended use.- Telescope Mount: M128A1 is a component of Sightunit: M53A1. The mount introduces measured azimuth and elevation readings to Elbow Telescope: M109. The sightunit is primarily used to lay mortars and rocket launchers for indir
48、ect fire. 6.2 Ordering data. - Procurement documents should specify the following: (a) (b) packaging, and packing. (c) Applicable stock number. (d) (e) Title, number, and date of this specification. Selction of applicable levels of preservation, Applicable packaging data cheek number (see 5.1). Provisions for First Article testing. Custodian: Army - MU Preparing activity : Amy - MU Project No. 1240-AZO9 14 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
