1、.k MIL-B-60135 ( bb 79777Ob 0342577 1 I MIL-B-60135 (MU) AMENDMENT 8 28 December 1971 SUPERSEDING AMENDMENT 7 30 March 1970 MILITARY SPECIFICATION BODY ASSEMBLYy TANK PERISCOPE: 10513599 This amendment forms a part of Military Specification rnL-B-60135(MU), dated 22 January 1965. * * * Paragraph 2.1
2、, under STANDARDS add: “MIL-STD -810 Environmental Test Methods“ Paragraph 3.6.1.1: Delete paragraph and substitute: “3.6.1.1 Operating temperatures.- There shall be no visible flicker of the image tubes while thermally stabilized at temperatures of -40F and +125“F, when energized from an 18 to 30 v
3、dc power source. shall be given a minimum of 5 minutes warm-up time before checking for flicker . “ The assembly Paragraph 3.6.2: Delete-and substitute: “3.6.2 Rigidity.- The catches shall be capable of securing the body assembly rigidly against the locating surfaces of the head and mount which it i
4、s intended to be used. This requirement shall be met during and sub- sequent to a vibratory exposure along 3 mutually perpendicular axes. The vibration shall be a simple harmonic motion; the frequency varying either linearly or logarithmically from 5 to 55 to 5 cps in 5 - minute cycles for a total o
5、f 15 minutes along each of the axes. The amplitude of vibration shall be maintained constant at 1/64-inch (1/32-inch double amplitude) .I1 Paragraph 3.9: Delete paragraph and substitute: “3.9 Image steadiness.- There shall be no image movement or visible flicker subsequent to a minimum of 5 minutes
6、stabilization or tube warm-up time, when the assembly is energized from an 18 to 30 vdc power source or a 1.5 vdc dry battery.“ Paragraphs 3.10, 3.10.1 and 3.10.2: Delete and substitute: “3.10 Collimation.- The requirements of 3.10.1 and 3.10.2 shall be met under the following conditions: (a) The to
7、p surface of the body housing in a horizontal plane. (b) A target, 18 to 20 yards above the top surface of the body which lieS.on a vertical line perpendicular to a line joining the centers of the two objective apertures and at its midpoint. - FSC 6650 L- Provided by IHSNot for ResaleNo reproduction
8、 or networking permitted without license from IHS-,-,-MIL-B-60135 (MIT) AMENDMENT 8 3.10.1 Dipvergence.- The angle formed by the two emergent lines of sight shall not exceed 15 minutes of arc. 3.10.2 Divergence.- The two emerging lines of sight shall diverge within the limits of 5 and 30 minutes of
9、arc.“ Paragraph 3.11: Delete paragraph and substitute: “3.11 Image tilt.- The image of a target line originally perpendicular to a plane, defined by the 2 inch long shoulder (generated by the machining of the pads) adjacent to Valve Assembly 8201751, shall emerge perpendicular to the same plane with
10、in 45 minutes of arc.“ Paragraph 3.13: Delete “7.0 minutes“ and substitute “4.0 minutes“. Add the following new paragraph: “3.13.1 Obiective focus.- The objective assemblies shall be focused for the best image of a target at the center of the field, 18 to 20 yards above the top surface of the body.
11、body fulfils the resolution requirement,“ Best image is defined when the periscope Add the following new paragraphs: “4.1.2 First article (initial production) approval.- The requirement for first article approval and the responsibility (Government or contractor for first article testing shall be as
12、specified in the contract. The sample for first article approval tests shall consist of three (3) body assemblies plus 3 each of all items covered by SQAP. manufactured in the same manner, using the same materials, equipment, processes, and procedures as used in regular production. materials, includ
13、ing packaging and packing, shall be obtained from the same source of supply as used in regular production. The sample shall be All parts and 4.1.2.1 Government testing.- When the Government is responsible for conducting first article approval tests, the contractor, prior to submitting the sample to
14、the Government, shall inspect the sample to insure that it conforms to all the requirements of the contract and submit a record of this inspection with the sample, including certificates of conformance for materials. 4.1.2.2 Contractor testing.- When the contractor is responsible f0.r conducting fir
15、st article approval tests, the sample shall be inspected by the contractor for all the requirements of the contract. a record of this inspection, including certificates of conformance for materials, shall be submitted to the Government for approval. ment reserves the right to witness the contractors
16、 inspection.“ The sample and The Govern- * Paragraph 4.2.2, Table I: Characteristic 108, change “4.5.3.7“ to “4.5 . 3 . 7 . 1. I Page 2 of 7 Pages Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-* * MIL-B-60135 (MU) AMENDMENT 8 Paragraph 4.2.2, Table
17、 I: Add new characteristic, requirement and test: “109 . Objective focus 3.13.1 4 . 5 . 3 . 711. Paragraph 4.3.2: Delete “Three body assemblies“ and substitute “Ten body assemblies“. Paragraph 4.3.2: Following Characteristic 306, add new requirement and test: “307. Operating temperatures 3.6.1.1 4.5
18、 . 2 . 1 . 1 Paragraph 4.4.2.3.2: Delete paragraph and substitute: “4.4.2.3.2 Sealing.- Special testing equipment to test the sealing of the body assembly shall conform to the requirements of Drawing F8565556, Pre s sure Tes ter -Two Stat ion. Paragraph 4.4.2.4: Delete and substitute: “4.4.2.4 Devic
19、e to test optical performance requirements.- The body assembly shall be tested for the performance requirements when mounted and secured to a testing device or fixture the accuracies of which shall con- form to the pertinent features and accuracies depicted on Drawing F10527436 and drawings pertaini
20、ng thereto shall apply. a. Pretest information.- The test fixture shall be solidly supported on a leveled surface. This fixture shall also provide a power supply of 24 Vdc to illuminate the body assembly under test. b. Set-up.- Place a one minute or better level across datum 11 11 A shown on Fixture
21、 Drawing F10527436, Sheet 1, and by means provided adjust until test fixture is level. Then secure the fixture. C. Suspend plumb lines in front of the double telescopes de- picted on Drawing F10527436, Sheet l, until the vertical center lines of the reticles are parallel to the plumb lines. telescop
22、es shall contain an erecting system. The viewing unity power d. Target.- A fabricated target shall be a square approximately 12 inches by 12 inches with a central vertical and horizontal line that shall cover the full length and width of the target square. The target shall contain white dull lines a
23、gainst a black absorbing background. width of all target lines, excluding the resolution pattern lines shall be 2 minutes tr 30 seconds wide to permit good visibility. The e. Illumination.- The target shall be illuminated with two light sources containing 100 watt bulbs on Corning Glass #2563 filter
24、s or equivalent. The light sources shall be placed out of view of the line of sight but capable of providing sufficient illumination of the target. The resolution chart shall be centered about the geometric axis of the target. Page 3 of 7 Pages . Provided by IHSNot for ResaleNo reproduction or netwo
25、rking permitted without license from IHS-,-,-MIL-B-60135 (MU) AMENDMENT 8 f. A qualified leveled surface for mounting the target shall be provided and it shall be so constructed to permit lateral movement of the target and maintain plumb of target image. The zero vertical line shall be alined plumb
26、prior to any test accuracies of the body assembly. addition, the target shall contain a rectangular pattern with acceptance limitation markings positioned from the left to the right of the zero vertical and horizontal lines. The acceptance limitation markings for divergence shall read 5 minutes to 3
27、0 minutes. divergence shall read 15 minutes below and above the zero horizontal target image line. The fabricated target shall be positioned 56 feet 10 inches -f- 3 feet from the front machined surface of the 45“ mirror support conform- ing to Drawing F10527436, Sheet 6, and positioned as shown on S
28、heet 1 of Drawing F10527436. Its center shall be 1 inch -f- 1/4 inch above the datum surface “A“ and lie in the vertical plane passing the center of the holding fixture within 1/4 inch. In Limitation markings for g. Viewing telescopes.- The emergent rays of the body assembly shall be measured with a
29、id of the viewing telescopes Number 91-75-2 as shown on Drawing F10527436, alined to the geometric optical axis of the body eye- piece assemblies. and lay in the same horizontal plane. telescopes shall be alined plumb when in the test position. The viewing telescopes line of sight shall be parallel
30、The vertical reticle lines of the h. Mount the body assembly to text fixture. While viewing through the left unity power telescope readjust target for centering of the target on the reticle in the unity power telescope. scopes. pattern. lf Remove the tele- With the unaided eye adjust target for best
31、 focus of resolution Following paragraph 4.5.2.1, add new paragraph: “4.5.2.1.1 Operating temperatures.- The body assembly shall be exposed to the temperature conditions specified in 3.6.1.1, utilizing testing equip- ment in accordance with the “Test Facilities“ requirements of MIL-F-13926. The body
32、 assembly shall be placed in the cold chamber and the temperature of the chamber reduced gradually to -40F. The body assembly shall remain at this temperature for a minimum of 5 hours. At the completion of this 5 hour period and while at -40“F, the body assembly shall be checked for flicker. The tes
33、t shall be accomplished using the power supply capable of supplying the specified source. receptical and place the double-pole double-throw switch in the 24 Vdc (ON) position, observe that there is no visible flicker of the image tube after being energized for the time period specified in 3.6.1.1. t
34、est, the body assembly temperature shall be gradually raised to room ambient temperature. The body assembly shall then be placed into an oven chamber and the temperature shall be raised gradually to +125“F. The body assembly shall remain at this temperature for a period of 5 hours and at the con- cl
35、usion of this 5 hour period, and while at +125“F, the body assembly shall again be subjected to the test depicted above to determine compliance with 3.6.1.1. Upon completion of this test the temperature of the test chamber shall be gradually reduced to room ambient temperature (60F to 90F) at Apply
36、a nominal 24 Vdc to the 24 volt View through the eyepiece assembly of the periscope body and Upon completion of this - Page 4 .- . of 7 Pages 1 . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-bOL35 (8) 66 7797906 OLY2b03 T D MIL-B-60135 (MU)
37、AMENDMENT 8 which time the body assembly shall be removed from the test chamber. shall be exercised during this test to avoid subjecting the body assembly to thermal shock. Caution NOTE: The rate of temperature change in the test chamber shall not exceed 20F per hour throughout the temperature cycli
38、ng test of 4.5.2.1 and 4.5.2.1.1.“ * Paragraph 4.5.2.2: Delete and substitute: “4.5.2.2 Rigidity.- Standard vibrating equipment shall be utilized for this test. a holding fixture as shown in Figure 1. in the holding fixture by means of the catches (see Figure 1). shall be performed in accordance wit
39、h Method 514, Procedure lX, Part 1 of MIL-STD-810 except that the conditions in 3.6.2 and as specified herein shall apply. The body assembly under test shall be vibrated along the three mutually perpendicular axes while the body assembly is maintained immobilized in the holding fixture. monitored at
40、 the extreme bottom portion of the body assembly as positioned in the fixture. During vibration, check rigidity of the body assembly in the holding fixture using a stroboscope to produce the optical effect of stopping the vibration motion. The body assembly shall remain secure against the holding fi
41、xture receiving surfaces to assure conformance with the requirements of 3.6.2. shall be subjected to the examination specified in 4.5.2.2.1.“ The vibrating machine shall be equipped with means to secure Attach and clamp the body assembly The test The amplitude of the applied vibration shall be At th
42、e conclusion of this test, the body assembly * Add the following new paragraph: “4.5.2.2.1 Examination.- Subsequent to rigidity (vibration), the body assembly shall be examined for any evidence of physical failure such as; A visual examination shall be made for casting failure, glass breakage, missi
43、ng or damaged parts. for undue irregularity of movement, friction or looseness. A functional examination of the catches shall be made to determine that the body assembly is clamped securely in the holding fixture, when the catches reach their apex and are fully closed. An audible examination shall b
44、e made of the body assembly for loose or broken internal parts such as the optical components or image converter tube, etc. Body assemblies that have satisfactorily passed aforementioned examinations shall be tested for and meet all the other requirements of this specification.“ A tactile examinatio
45、n shall be made of moving parts Paragraph 4.5.2.3: Delete paragraph and substitute: “4.5.2.3 Sealing_.- The internal pressurizing of the body assembly to test sealing, shall be performed with special testing equipment conform- ing 4.4.2.3.2. value specified in 3.8 in accordance with the procedure fo
46、r internal pressure testing on Sheet 1 of Drawing F8565556. bodyassembly for a period of 5 minutes 115 seconds. At the end of the 5 minute period there shall be no evidence of leakage, as indicated on the pressure gauge of the testing equipment, to determine compliance with 3.8. The body assembly sh
47、all then be subjected to the test in 4.5.2.4.“ Pressurize the body assembly with dry nitrogen gas, to the Retain the applied pressure in the - . i . . - Ct Page 5 of 7 Pages ,- -_ . t Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-60135 (Mu) A
48、MENDMENT 8 * Following paragraph 4.5.2.3, add new paragraph: * “4.5.2.4 Interior atmosphere,- A dew point tester shall be used to test the dew point of the interior atmosphere of the body assembly. Upon satisfactory completion of the sealing test, the internal pressure of the body: assembly shall be
49、 reduced to 1 psig. flushed with dry nitrogen gas. be controlled by a regulator that will prevent the internal pressure in the body assembly from exceeding 1 psig during the flushing operation. The flushing shall continue until the nitrogen gas bled from the body assembly has a dew point at least as low as minus 25“F, as measured with the dew point tester. The internal atmosphere of the body assembly shall conform to the requirements of 3.14.“ The body assembly shall t
