1、 MIL-G-17027D 13 m 9999906 0300106 9 SS -a MIL-G-.D( OS) 7 June 971 MiLITARY SPECIFICATION GYRO, STEZRING (Fbr Torpedo Mark 37 Mods O, 2, 3) This specification has been approved by the Naval Ordnance Systems Cornniand, Department of the Navy 1. SCOPE 1.1 Scope. This specification establishes the req
2、uirements far the procurement of a steering gyro, NAVORD 19 620. 2.1 The following docunaents of the issue in effect on the date of Zn- vitation for bids or request for prqpods form a of this specific General, publications re- quested by contractors in connection with.specific procurement functions
3、shouid be obtained from the procuring activity or as directed by the con- . tracting officer,) 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. the issue in effect on date of invitation for bids or request for proposals shall apply. Un
4、less otherwise indicated, NAIPIONAL BUREAU OF SPANDARDS PUBLICATIONS Handbook H28 Screw-Thread Standards for the Federa Services (Application far copies soud be adressed to the Superintendent of Documents, Governuent Printing Office, Washington, D. C. 20402.) F 2 Provided by IHSNot for ResaleNo repr
5、oduction or networking permitted without license from IHS-,-,-MIL-G-L7027D 13 97779Rh 0300LO 2 1-19027( os) 3. mQUIXEXW?S 3.3. Description. TM.S specification covers a “freegyro,“ that is, one having three degrees of freedom of rotation, which is used as a course control element in Torpedo Mk 37 Mod
6、s O, 2, and 3. an efficiently designed gyro rotor with a high rotational moment of in- ertia. When this rotor is spinning, it tendsto maintain its axis fixed in space regardless of the rolling, pitching, and yawing of the torpedo, or of the rotation of the earth. A Mk 22 synchro transmitter rotor is
7、 attached to the gyro outer gimbal and the stator is mounted in the gyro case. Therefore, any turning of the torpedo causes a rotation between the synchro rotor and stator, which generates a voltage that is fed to the control system. Systems. A braked servomotor in the gyro turns the synchro stator
8、through a gear train. the servomotor is in the deenergized condition; the brake is unlocked when the gyro is caged and the servomotor is energized. Therefore, the synchro is used for remotely setting and controlling the torpearting prcduction , that the contractors production methos are capable of p
9、roducing steering gyros that coqly with the techical re- quirements of the contract. 3.2.2 Preproduction sample. Unless otherwise specified in the contract See 4.3.1. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-L - .- MIL-G-L7027D L3 M 777770b
10、03001i07 Y M 3.2.3 Mwberials. Uriiess otherwise specified in the contract, requisi- tion, or order, all materiah and purchased parts entering into the final assenibly of the steering gyro SU conform strictly to the detailed re- quimnts indicated in the drawings ad specifications listed in NAVOFD ID
11、620060. 3.2.4 Finishes, coatings, construction, an dimensions. Finishes, coatings, construction, and dimensions for the steering gyro ahail be strictly in accordance with applicable drawings, specifications, an p. hking of asseniblies, ster Mk 22, conforming to the r,equirements of MIL-S- 16892 . 3.
12、3.2.1 Zeroing. The synchroshallbe so mounted on the gyro assembly that Che synchro is electricaliy zeroed, as descrbed in 4.5.3.6, when the ginibals are in the cagea position. 3.3.3 Balance. The gyro shall be balanced and adgusted for operation Compensation for operation at other latitudes at zero d
13、egrees latituae. (creep) shall not be incorporated in the QSTO assenibly. 3.3.3.1 Precession. The allowable precession (*) shall not exceed 1.75 amperes. The starthg current in the remaining power line (phase C) shall not exceed 1.5 amperesl when tested as in 4.5.3.15. . 3.3.4.3 Runni current. The r
14、unning current in two of the three power lines (phase _ng_r_ A and B shal not exceed 0.8 emgere. The running current in the remaining power line (phase C) shall not exceed 0.6 smpere, when tested as in 4.5.3.16. 3.3.5 Anticircuar run (ACR) contacts 3.3.5.1 Actuating ang le. The steering gyro shall h
15、ave a set of con- tacts (CC202 on NAVORD Drawing 2413255) so arranged that between i65 and 175 degrees of gyro rotation in either direction from the caged position shall close the contacts. and counterclockwise actuating angles shall not exceed six degrees. When actuated as in 3.3.5.1, the contacts
16、shall remain closed for not less than 8 nor more than 18 additional degrees of gyro rotation. dwell angles shall not exceed six degrees. 3.3.5.1 so they cannot be closed with 360 degrees rotation of the steering mo. The difference between the clockwise actuating 3.3.$.2 Dwell angle. The difference b
17、etween the clochise and counterclockwise 3.3.5.3 Provision shall be made to withdraw the contacts described in 3.3.5.3.1 The contacts shall be withrawn upon application of 26 plus . or minus 2 volts dc to solenoid SL202, NAVORD Drawing 2413255. At no instant, prior to, during, or after withdrawal of
18、 the contacts, shall there be any closed circuit between P or P201 and T of P201. The only exceptions are at the ACR closure points, which occur at i65 to 175 de- ees rotation in either direction and with the ACR contacts extended not withdrawn). 3.3.15.32 When the contacts are closed as described i
19、n 3.3.5.1, they shall not be damaged by continued rotation of the steering gyro, and the minhm separaCion of O.063, specified on Drawing 860101, shaU be maintained when the contacts are free Frain the i65 to i75 degree actuators. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted
20、 without license from IHS-,-,-3.3.6 Remote setting system. The remote setting system must operate . 3.3.6.1 Setting accuracy. The gyro must be capable of setting within 3.3.6.2 The gyro must have Ir slewing speed of at least compatibly with current Fire Control $ystems or their equivalent. plus or m
21、inus 0.75 degree of any angle set on the fire control system. 35 degrees per second. lewing sp eed. 3.3.7 Insulation. All wiring shall withstand a hi-pot test of 500 volts, 60 Hz for one minute between ground and all pins (connected to- gether) of 201, NAVORD Drawing 2413255, ancl between all mtuaii
22、y insu- lated pins. 3.3.8 insulation resistance. The inmiation resistance at 500 volts plus or minus 50 volts dc, between groun and all pins (connected to- gether) of P201, NA,VORD Drawing 2413255, and between all mutually insu- lated pins, shall be greater than twenty megohms. 3.3.9 ope rating life
23、. 3.4 Environmental requirements. The steering gyro shall meet the other The steering gyro sha have an operating life of 500 cycles of 10 minutes per cycle, as described in 4.4.3. amlicable requiremnts of this specification during or after the teste definea or specified in 4.4. 3.4.1 Vibration. !he
24、steering gyro shall meet the following vibration requirement 6 : 5 3.4.1.1 Vibration, nonoperating, !i?he steering gyro sa,ll show no dam- age asti shall meet aU the performance requirements and prcuct charac- teristics of this specification after being tested as in 4.4.1.2. 3dt.1.2 Vibration, opera
25、ti%. The steering gyro shall show no damage and shall meet all the performance requirements and product chamcteris- tics of this specification during and after the test specified in h.4.1.3. 3.4.2 Temperature tmd humidity -* 3.4.2.3. Hi. The steering gyro shall meet 3.4.2.4 Lw temperature, operatitq
26、. The steering gyro sal be cap- 3.5 Cleanup. Prior to and aft;er final assenbly, all parts, components, and the assenibly shal be thoroughly cleaned of loose, spa%tered, CIT ex- cess solder, metal chips, and other foreign matter. as well as rosin flash, shdl be removed. Burrs and sharp edges, 3.6 Wo
27、rkmanship. The equipment, including all prts and accessories, shall be constructed and finished in a niamer to ensure compliance with all requirements of this specification. paid to neatness and thoroughness OP soldering, wing, -king of parts and assexxiblies, impregnation of coils, plating, paintin
28、g, machine screw asseniblage, welding, brazing, and freedom of garte from e31 burrs and sharp edges. production sample, subJect to any qualification stated in the Governments notice of approval, shall be determinative of the requirements of the con- tract relative to woriaivmship insofar as not i3pe
29、cificaU.y covered by ap- plicable specifications. Particar attention shall be The standards of worlmianship exhibited in any app?oved pre- 4. QUALITY ASSITRANCE FROVSIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier is responsible for
30、theperform- ance of all inspection requirements as specified herein. Except as other- wise specified in the contract or order, the supplier my use bis cvwn ur ,any other facilities suitable for the performance of the inspection re- quirements specified herein, unless tiisapproved by the Gwernment. T
31、he Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to as- me supplies and services conform to prescribed requirements. 4.2 Classirication of inspections. Inspection of the steering gyro shall be classified as
32、follows: 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-l9027D( OS) (c) Periodic production inspection (paragraph 4.4) 4.3 Sampling 4.3.1 Preproduction. A preproduction sample of five steering gyros, manufactured in accordance with 3.2.2, sh
33、all be sajected to the prepro- duction tests detailed in 4.4 at an activity designated by the procuring activity. Acceptance of the preproduction sample shall be based on no defects in the sangle. supplier, prior to the approval of the preproduction sample, shall be at the suppliers risk. -her produ
34、ction of the steering gyros by the 4.3.2 Lot size. Unless otherwise specified in the contract or order, each shipment of units of product shall be a separate “inspection lot“ and may differ fromthe quantity specifled in the total order or con- tract in a lot for produc-bion, shipment, or other purpo
35、se. all units of a single “inspection lot“ shall be made to the stme design, with the erne materials ana manufacturing techniques, and shall be part of one con-binuous production run. In any event, 4.3.3 Periodic production amples. From each mcceedng lot or grand lot of 300 or less that have passed
36、the qiiality conformance inspection of 4.5, a random sample of 5 steering gyros will be selected for sub- mission to an activity designated by the procuring activty to determine compliance of the saqles with the requirements of the contract, speci- fication, and drawings. !Che steering gyros shall b
37、e considered satis- factory if they meet all specification and pertinent drawings require- wnts and wlthstand the tests specified in 4.4 and 4.5. Failure of the periodic production sample to coqy with these requisements willre- sul% in the rejection of the lot, as determined by the procuring activ-
38、ity. tion and periodic production samples, after satisfactorily passing the quality conformance inspections detailed in 4.5, shall be subjected to the following tests and examinations. ing the results of preproduction and periodic production inspections shall be f-ded to the procuring activity. 4.4
39、Preproduction an periodic production inspection. The pkeproauc- Certified inspection ata cover- 4.4.1 vibration 4.4.1.1 Mounting. The steering gyro, less pack or packaging shall be c- mounted rigidly to a vibration device by means of the four mounting holes sham on Dwg 1873928 an tested as specified
40、 in 4.4.1.2 and 4.4.1.3. 4.4.1.2 Vibration, nonaperating. The Steering gyro shall be siibjecte to the “Vibration, nonoperating“ test of KtL-E- The manufacturer shall furnish all necessary test equipment and facilities and shall pro- vide personnel for performing all quality conformance inspections.
41、The test equipment shall be adequate in qumtity mi, where definite require- mnts are not specified, shall be of sufficient accuracy and cpality to permt performance of the required tests. equipinent are required to perfom the quality conformance tests: The following items of tes% 4.5.2.1 Power ource
42、s: 4.5.2.1.1 DC parer suppy, capable of adjus2mien-t over the mage of 23 4.5.2.1.2 33.5 volt plus or minus 3 percent, htl Hertz (Hz) plus or to 29 volts, of at least 5 amperes capacity. minus 2 percent, 3 phase. u Provided by IHSNot for ResaleNo reproduction or networking permitted without license f
43、rom IHS-,-,- - MIL-G-19027D 13 W 9777906 0300L17 3 W MZL-GW27D( OS) lent, with 360 degrees rotation and the ability to set angles to the nearest 1/4 degree. . 4,5.2.2.1 Gyro Test Stand Assembled, NAVORD .Drawing 87790 or equva- 4.5.2.2.2 Roil, pitch, and yaw table (Navy Stock Nuniber 88-0-798-020- O
44、OO) U5 volts, 60 Hz, single phase, capable of being set zero to 15 de- grees from horizontalwith autcmtic reversing, six cycles per minute with a capacity of i5 pounds. 4.Sr2.3 Vacuum tube ac voltmeter, capable of reading 0.1, 0.3, 1, 3, io, 30, 100, and 300 VOS. 4.5.2.4 Matching synchro box. This b
45、ox shall contain a synchro elec- trically equivalent to Navy Syncbro Control Itramformer Mk 14, an shall have provisions forrotating the synchro rotor so that the angle of rota- tion can be read to the nearest 1/10 of one degree. 4.$.2.5 Rate turntable. Rate Gyro !Bible Assenbled, NAVRD Drawng 87340
46、2 or equivalent, operated from i15 volts, 60 iz single phase with a rotat- table capable of turning at speeds up to three rpn. volts dc over the ranges of O-20-20,OOO megohms with an accuracy of 2 cent . 4.5.2.6 Megohumeter, capable of nirrasuring insulation resietance at 500 405.207 One 10k plus or
47、 mnus 10 percent, 2 watt potentiometer. 4.$.2.8 Dc ammeter, cawle of reading current up to 5 amps ac with an accuracy of 3 percent. 4.5.2.9 AC amueter capable of recording 400 Hz ac, rms current qp to 4.S.2.10 Ohmmeter. 4.5.2.U Current Mre Control Systems or ther equlva3ent. 4.5,2.i2 OscilXoscape, T
48、ektronix me 310A or equivaJent. 4.5.2.13 Test leads and small tools as requkred. 4.5.3 Test procedure. The following tests constitute the quality con- 5 ves, with an accwacy of 3 percent. f!xmce tests of the steering gyro. unless otherwise specified, all pins an connec%ors cibd are shown on MVORD Dr
49、awing 24i3255. 4.5e3.1 Mat the steering gyro on the rate turnkible (4.5.2.5) with th spin axis para3ld. to the plane of te Mie. - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4.5.3.2 Connect a jumper across pins M-N of P201 axxi apply 26 plus or minus 1 volts dc across pins M-P of EO1 (pin M being negative). The gyro shall cage as specified i
