1、MIL-S-50725 12 9977906 0426790 9 H MILITARY SPECIFICATION. SIGHT, BORE, OPTLCAL: M45E1 MIL-S-50725 (MU) 26 April 1971 1. SCOPE 1.1 This specification covers one type of instrument known as Sight, Bore, Optical: M45El used for boresighting mortars. specification this instrument is referenced as “Bore
2、 Sight“. Telescope, Elbow Assembly 10548042-2 is an integral component of this bore sight. Throughout this 2, APPLICABLE DOCUMENTS 2.1 The following documents, of the issue in effect on date of invi- tation for bids or request for proposal, form a part of this specifica- tion to the extent specified
3、 herein. SPECIFICATIONS Mili tar y . MIL-F-13926 Fire Control Materiel, General Specifi- cation Governing the Manufacture and Inspection of MIL-P-14232 Parte, Equipment and Tools for Army Materiel, Packaging and Packing of MIL-1-45607 Inspection Equipment, Acquisition, Supply and Maintenance of MIL-
4、T-46324 Telescope, Elbow, M109 and Telescope, Elbow Assembly 10548042-2. STANDARDS Mi li tary MIL-STD-105 Sampling Procedures and Tables for MIL-STD- 109 Inspection by Attributes Quality Assurance Term8 and Definitions DRAWINGS U.S. Army, Frankford Arsenal F16548286 PACKAGING DATA 10549221 Sight, Bo
5、re, Optical : M45E1 SHEET Packaging of Sight, Bore, Optical: M45E1 W/E FSC 1240 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_-_ -. MIL-S-50725 32 W 979990b 0426793 O MIL-S-50725 (MU) (Copies of specifications, standards, drawings and packaging da
6、ta sheets required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or, as directed by the con- tracting officer.) 3. REQUIREMENTS - 3.1 Materials.- The materials shall be in accordance with the draw- ings, material specifications and gene
7、ral specifications forming a part of this specification. 3.2 Fabrication.- The bore sight shall be manufactured in accordance with Drawing F1054.8286. 3.3 General specifications. - The contractor shall be responsible for adherence to, and compliance with, the following requirements of MIL-F- 13926 :
8、 a. Order of precedence b. Dimensions and tolerances C. Inorganic protective surface finishes d. Part identification and marking e . Workmanship 3.4 Telescope, Elbow, Assembly 10548042-2.- The Elbow Telescope, which is a part of the bore sight, shall have met the requirements of MIL-T-46324 prior to
9、 assembly as a bore sight. 3.5 Orientation.- The bore sight shall be clamped securely in each of the three mounting positions shown in Figure 1 with the respective V slide contacting the longitudinal portion of a smooth 4.5 inch diameter tube or equivalent, whose axis is inclined 45 degrees above th
10、e horizont- al. The following conditions shall be met at each of the above specified positions unless otherwise specified. 36 Accuracy. 3.6.1 Collimation.- With the cross level vial bubble centered within 112 the spacewidth between two graduation lines, the line of sight Of the elbow telescope shall
11、 be parallel to the vertical plane passing through the axis of the corresponding V slide within 3 mils for positions (a) and (c) of Figure 1. 3.6.2 Pl3.mib travel.- With the cross level vial bubble centered with- in 112 the aphceiJidth between two graduation lines, and using position (a) of l?uce 1
12、in accordance with 3.5, with the line of sight of the el- bow telescope in a h6rizontal plane and in coincidence with a plumb line; the line of sght shall not deviate from the plumb line by more than 2.0 mils, (4.0 mils total displacement) from maximum depression to maximum e levat ion . 2 Provided
13、by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-50725 12 W 7797706 OY26772 2 MIL-S-50725 (Mu) 3.6.3 Inverted level vial.- With the level vial bubble centered with- in 1/2 the space width between two graduation lines, using position (b) of Figure 1, the
14、line of sight shall not deviate from the plumb line by more than 1.0 mil (2.0 mils total spread) when elevated 30 degrees above the horizontal. e 3.6.4 Elevation level vial.- With the cross level vial bubble cent- ered within 1/2 the space width between two graduation lines, the eleva- tion level vi
15、al bubble shall be centered within 1/2 the space width between two graduation lines. 3.7 Telescope travel.- With position (a) of Figure 1 established in accordance with 3.5, the telescope shall be capable-of being rotated a minimum of 45 degrees in elevation and 30 degrees in depression. 3.8 Operati
16、ng temperature.- The bore sight shall meet the torque re- quirements of 3.9 when thermally stabilized at ambient temperatures of minus 40 degrees Fahrenheit and plus 150 degrees Fahrenheit and the strap assembly shall be completely operable when securing and loosening the bore sight to the tube. 3.8
17、.1 Clamp screw.- The clamp screw, in a free state, shall be op- erable throughout its threaded portion without restriction or binding at all temperatures specified below. 3.9 Torque.- The torque required to elevate and depress the tele- scope through full travel shall not exceed 10 pound inches nor
18、be less than 2 pound inches at room temperature (60 to 90F). The torque requir- ed to elevate and depress the telescope through full travel. shall not ex- ceed 28 pound inches nor be less than 2 pound inches at the extreme temp- eratures specified in 3.8. 3.10 Strap assembly.- The bore sight or stra
19、p assembly shall not be- come loosened as a result of applying 2 pounds direct force at the knurled portion of the clamping screw, once in each opposing direction parallel to the tube axis, when the bore sight is positioned and secured as shown in (a) of Figure 1 with a torque of 2 f 1/4 pound inche
20、s applied to the clamp screw. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspectionr- Unless otherwise specified in the contract or purchase order, the supplier is responsible for the per- formance of all inspection requirements as specified herein. Except as otherwise specified, the sup
21、plier may utilize his own facilities or any other facilities suitable for the performance of the inspection require- ments specified herein, unless disapproved by the Government. The Govern- ment reserves the right to perform any of the inspections set forth in the specification where such inspectio
22、ns are deemed necessary to assure supplies and services conform to prescribed requirements. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-S-50725 12 m 7777906 0426773 4 m c 1 MIL-S-50725 (Mu) 4.1.1 General provisions.- The component and suba
23、ssembly inspection requirement of MIL-F-13926 form a part of the Quality Assurance Provisions of this specification. in MIL-STD-109. Definitions of inspection terma shall be as listed 4.2 First article (initial production) approval.- The requirement for first article approval and the responsibility
24、(Government or contractor) for first article testing shall be as specified in the contract. le for first article approval tests shall consist of 3 bore sights plus 3 each of all items covered by SQAP. The sample shall be manufactured in the same materials, equipment, processes, and procedure6 as use
25、d in regul- ar production. shall be obtained from the same source of supply as used in regular pro- duct ion. The samp- All parts and materials, including prlckaging and packing, 4.2.1 Government testin%.- When the Government is responsible,for conducting first article approval tests, the contractor
26、, prior to sub- mitting the sample to the Government, shall inspect the sample to insure that it conforms to all the requirements of the contract and submit a re- cord of this inspection with the sample, including certificates of confor- mance for materials. 4.2.2 Contractor testinK.- When the contr
27、actor is responsible for conducting first article approval tests, the sample shall be inspected by the contractor for all the requirements of the contract. and a record of this inspection, including certificates of conformance for materials, shall be submitted to the Goverment for approval, The Gove
28、rnment reserves the right to witness the contractors inspection. The sample c a zC.3 Inspection provisions. 4.3.1 Submission of product.- Unless otherwise specified by the con- tracting officer, inspection lot size, lot formation and presentation of lots shall be in accordance with “Submission of Pr
29、oduct“ provisions of MIL-STD-105 4.3.2 Examination and tests. 4.3.2.1 Components and subassemblies.- All components and subassem- blies shall be inspected in accordance with the inspection provisions contained in Supplementary Quality Assurance Provisions (SQAP) lited in th technicl ciara package (T
30、DP). In the abBence of SQpIps-, the applic- able Quality Assurhnce Provisions of MIL-F-13926 shall apply. and test% 1%1%l to Section 3 herein shall be perfarmed on single de- fect tittiwkdt$l characteristic) basis in accordance with MIL-STD-105 and O? 25 (Mu) 7 3 the strap assembly in the position (
31、b) of Figure 1. precisely eight feet from the center of the pivot shaft of the bore sight and in a vertical plane with the axis of the tube. sight with a 1/8 inch aperture placed.on the objective end of the tele- scope, move the bore sight until the cross mark of the telescope coincides with the plu
32、mb line when elevated 30 degrees above the horizontal. this position, check the level vial which shall meet the requirements of 3.6.3. Locate a plumb line By means of a peep In 4.6.5 Elevation level vial.- Elevation level vial test is made by checking the 45 degree angle of the tube of the device by
33、 means of a commercial optical protractor. trated in (a) of Figure 1, and cross level. In this position, the eleva- tion level vial shall be central within the tolerance of 3.6.4. The same test is repeated for checking the other “V“ slide with the bore sight mount- ed as illustrated in (c) of Figure
34、 1. Mount the bore sight on the tube as illus- 4.6.6 Telescope travel.- Telescope travel is accomplished with the bore sight and plumb line located as indicated in 4.6.4. Locate a mark on a chart eight feet above the horizontal line of sight which will indi- cate 45 degree elevation point, and anoth
35、er mark feet 7-1/2 inches below the horizontal line of sight which will indicate the 30 degree depress- ion point. meet requirements of 3.7. The telescope shall travel from one point to the other to 4.6.7 Operating temperature.- Operating temperature test is made by clamping the bore sight to a 4.50
36、 inch outside diameter steel tube by means of the strap assembly and exposing it to temperatures indicated in 3.8 by means of a comercial cold chest and oven. stabilized at these temperatures, the torque requirement of 3.9 shall be made by means of a comercial spring scale attached to the end of the
37、 telescope housing. The operability of the strap assembly is then checked by releasing the clamp and moving the bore sight, and re-clamping at dif- ferent poeitions. When thermally 4.6.8 Clamp screw.- Clamp screw check is a manual test made by revolv- ing the screw from one end of the thread to the
38、other end without binding or other restrictions at all temperatures herein specified. 4.6.9 Torque.- Torque test shall be made by means of a spring scale which can be hooked at one end of the telescope housing. is then moved through its full travel by pulling the scale and observing the indicator of
39、 the scale for requirements of 3.9. The telescope 4.6.10 Strap assembly.- Strap assembly test is performed by mounting the bore sight on the tube of the device in (a) of Figure 1, and by means of a torque wrench and adapter, apply a pressure of two pound inches to the clamp screw. the crosslines of
40、the telescope. tion of the clamp screw and apply the pressure indicated in 3,lO in op- posing directions parallel to the tube axis. Sight the telescope on a target at the intersection of Hook a spring scale on the knurled por- Observe the target thru the 8 Provided by IHSNot for ResaleNo reproductio
41、n or networking permitted without license from IHS-,-,- MIL-S-50725 12 W 777770b 042b778 3 MIL-S-50725 (MU) telescope and there shall be no relative movement of the telescope. 5. PREPARATION FOR DELIVERY 5.1 Packaging, packing and marking.- Qackaging, packing and marking shall be in accordancewith P
42、ackaging Data Sheet 10549221. shall be as specified in the procurement document. The level of protection 6. NOTES 6.1 Intended use,- In preparation for firing mounted or dismounted, the bore sight is used to establish a definite line of sight when boresighting Mortar, 81m Series, Mortar, 4.2 inch se
43、ries and Mortar, Self-propelled, Full Track, 107mm. 6.2 Ordering data.- Procurement documents should specify the following: (a) (b) Selection of applicable levels of preservation, packaging and (c) Applicable stock number. (d) Provisions for First Article testing. Title, number and date of this spec
44、ification. packing. Custodian : Army - MU Preparing activity: Army - MU Project No. 1240-A293 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-50725 12 = 9999906 0426799 5 m L-S-50725(MU) LiNE OF SiGiiT SIMULATED MRTAR TUBE MIS STRAP ASSEMBLY CLAMP SCREW Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
