NAVY MIL-T-8688-1954 TESTER ENGINE TACHOMETER《发动机转速测检测装置》.pdf

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1、SPZCIFICATIONS Military MIG55028 MILE-540 MILFI-5573 JAN-P-O JAN-P-3.06 J AN-P-116 JKN-P-I25 JAN-P-139 JAN-P-140 Drawhgs .and Data Lists; Preparation of Electronic Equipment, General Specification For Indicators; Tachometer, 0-110 Percant RPM, 2 inch sbe Packaging and Packing for herseas Shipent - P

2、ackaging and Packing for Overseas Shipment - Packaging and Packing for Overseas Shipment - Packaging and Packing for Overseas Shipment - Packaging and Packing for Oversaas Shipment - Packaging and Packing for Overseas Shipmnt - (For Enginss, Accessories and Othe?-! Auxiliary Equipment) Boxes; Nood,

3、Cleated, Plywood Boxes, Wood, Nailed Preservation, Methods of Barrier Materials, Vaterproof, Flexible Plywood, Container Grade Adhesives, ;Vater-Resistant, Case-Liner STANDARDS Eiilitary Standards b5LSTkL29 Marking of Shipments U33516 Case - Standard Dimensions for 3-1/4 inch Size Instrument DRAWING

4、S Air Force - Navy Aeronautical Standard Dra-s AND10401 AND10403 AND10412 Case - 2 Inch Size Instrument, Standard Dimensions Far ANDrOZ5 Case - Standard Dmensions for 2-3/1, Dial Instrument Case - Standard Dimensions for 1-7/8 Dial Instrument Drive - Type XV Fhgine Accessory Provided by IHSNot for R

5、esaleNo reproduction or networking permitted without license from IHS-,-,-bIIL-T-868fI ( Aer) (Copies of this specification and applicable specifications may be obtained upon application to the Commanding Officer, U. S. Naval kir Station, Johnsville, Pennsylvania, Attention: Technical Records Divisi

6、on, ) 3, RXJJIRfMENTS 3.1 Components.- The complete tester ah811 consist of R driving motor, a variable speed transmission, a stroboscopic speed synchronizing device, a tachometer drive shaft housing, and an indicator panel. in one unit. 3,2 Materials,- Materials shall conform to the applicable spec

7、ifications as specified herein, Materials which are not covered by applicable specifications, or which are not specifically described herein, shall be of the best quality, of the lightest practicable weight, suitable for the purpose intended. Component parts of two or more testers shall not be house

8、d 3.3 Electronic Equipment.- All electronic equipment used in the construction of the tester shall conform to the requirements of Specification MIL-E-5400. 3.4 Standard Parts.- AN or MS parts shall be used wherever they are suitable for the Commercial utility purpose, and shall be identified on the

9、drawing by their part numbers. parts such as screas, bolts, nuts, cotter pins, etc. may be used provided they possess suitable properties and are replaceable by the .AN or parts without alteration and provided the corresponding AN or bis part numbers are referenced in the parts list and, if practica

10、ble, on contractors draxings. on the date of invitation for bids, the commercial. parts may be used provided they conform to all requirements of this specification. 3.5 Design and Construction,- In case there is no suitable Corresponding AN or MS parts in effect The component parts of the engine tac

11、hometer tester shall be arranged substantially as shown in Figure 1, shall not require space in excess of six feet long by two feet wide by five feet high. design and construction shall be such as to pennit overhaul and repair without the use of special tools and fixtures. Urivhg Kotor.- Driving mot

12、ors shall be of the constant speed induction type rith capacitor starting, suitable for operating on 115/230 volt single phase alternating current. Kotors shall provide a minimum of seven pound inches torque at the input shaft of the drive shaft housing and shall be of sufficient horsepower that sli

13、ght variations in the line voltage will have negligible effect on the motor speed, The rated speed of the motor shall be determined by the design of the variable speed transmission, dhen assembled for operation, testers The 3.5.1 3.5.2 Speed Control.- The variable speed Lrmsmission shall be designed

14、 to provide a speed range at the tachometer outlets of from 300 to 5000 FAi. in tno steps, one for R low range of speeds from 300 to 2500 RI% for testing four pole tachometer generators, and the other for a high range of speeds fmm 400 to 5000 RPM for testhg two pole tachometer generators. by a knob

15、 or wheel requiring several revolutions to cover the complete range. speed of the output shaft shall be indicated by means of a pointer and dial. betvicen the control wheel and the variable speed transmission shall be such that backlash is kept to a minimum or entirely eliminated and the mechanism s

16、o etabilized that when a speed setting has been made there shall be no appreciable drift or hunting, 3.5.3 Stroboscopic .Speed Synchronizing Device.- stroboscopic speed synchronizing device shall be provided at the input shaft of the drive shaft housing for checking shaft speeds every 100 RPBI, from

17、 300 to 5000 RPM, The strobscope shall provide two different pattorns, one which vil1 appear stationary at the even 100 RPM settings and the other dich xi11 appear stationary at the odd hundreds. The stroboscope shall be located near the speed control wheel for convenient observation. The stroboscop

18、e lamp shall be mounted so that it can be observed directly through a perforated opaque drum. The drum shall be mounted on the drive shaft as shom in Figure 1. Stroboscope lamp flashes shall be maintained accuratb by means of a 60 cycle tuning fork oscillator. compensated so that the temperature coe

19、fficient does not exceed one part in 10,ooO at 20oC. This shall be accomplished Adjustment of speed shall be accomplished manually The approximate The linkage The oscillator unit shall be temperature .I“ 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-

20、,-,-.- MIL-T-BbB 66 W 7799706 OL2b752 T MILT- 8698 ( Aer) me stroboscope lamp ignition circuit shall be such that no adSustment is required after installation, and that the operation shall be satisfactory through a temperature range of 10C to 35C. 3.5.4 Drive Shaft Houcinq.- Drive shaft housings sha

21、ll be provided with six tachometer Outlets number 1 and 2 shall be geared to turn at speeds drive outlets as shown in Figure 1. of 902.5 and 975 RPM respectively when the reaaining outlets are turning at 900 RPM. speed ratios shall be maintained throughout the entire speed range. rotate in a clockwi

22、se direction looking into the outlet. be in accordance with AND2coO5. These Drive shaft housing outlets shall All drive outlets shall 3.5.5 indicator Panel.- An indicator panel shall be provided as an integral part of the tester. The panel shall be provided with cutouts and mounting holes for four 2

23、-314 inch dial instrunients having dimensions as sham on Drawing AND10401, or 3-1/4 inch dial instril- mnts having dimensions as shown on Drawing M33516, and three 1-7/8 dial instruments having dimensions as shown on Drawing AND10403 or 2 inch dial instrwnants having dimensions as shown on Drawing A

24、ND10412 as specified by the mm of =uf;ica The panel shall include suitable switches and terminal blocks and shall be wired as shown in Figure 2. 3.5.6 ufiring.- Suitable equipnient and wiring shall be provided for the control of the motor and stroboscopic speed synchronizing device. 3.6 directly and

25、 completely interchangeable with each other with respect to installation and performance. requirements of Specification MIt!, for check as to conformance with all the require.wnts of this specification. Director, Aeronautical Instrument 4.4 Tests.- 4.4.1 Procedure.- Four standard 4 pole tachometer g

26、enerators shall be munted on tachometer drive outlets number 1, 2, 3 and 4, Figure 1 and shall be connected electrically to the terininal blocks (see Figure 2). previously tested and furnished with correction carda. The motor and turning fork oscillator shall be energizod and operated for 15 minutes

27、 to warin up the equipment before starting the test. With the gear shifting mechanism in low range psition, the variable speed control wheel shall be rotated to the 300 Rphl setting, comparable with 600 RPM, on the tachometer indicator #3 and #4, Figure 1. The control wheel shall be adjusted until t

28、he pattern of the stroboscope appears to be stationary for at least 30 seconds. At this setting, indicators #3 and #4 should read apprhtely 600 RPM. the stroboscope pattern appears stationary. 100 RPM up to and including 4400 RPM. of indicated RPM shall be different from the pattern appearing at the

29、 even hundreds. #2, shall be checked by soma suitable means to determine that they are in accordance with ths requirements specified in paragraph headed IlDrive Shaft Housing. removed from the drive shaft housing and %two pole tachonieter generators shall be installed in positions 3 and 4, and two p

30、ercent type tachometer indicators shall be mounted on the indicator panel. terminal blocks. calibration cards. The instruments used in this test shall have been b.4.2 Speed Error Low Range.- The tachometer indicator pointers shall remain stationary so long as The stroboscope pattern appearing at the

31、 odd hundreds Synchroscope Outlet Error.- The speed ratios of the drive shaft Outlets #l and The above procedure shall be repeated at each 4.4.3 4.b.4 Speed Error (Hkh Range).- The Q 0000000000 I H -T Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-7

32、 SPDT TOGOLE SW. f- SYNCHROSCOPE INDICATOR (,“pal I INDICATOR I TACHCMETER INDICATOR %“INAL SMCK TACBOXETER INDICATOR i / U BOND TO TACEIOhfETER DRIVE SITAFT IIOUSING c n ia/l *Binding blooks shall be mounted on the front and rear of %he tednal blocks to acoomodate %he connection of vrires of both g

33、enerators and indicators. 6 WIRMD DUORAY OF INDICATOR PANEL mm 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-Bb bb W 7777706 0326956 7 m YILT- 8m(Aer) speed control wheel shal be rotated to the setting comparable with 400 WH. wheel shall be

34、 adjusted until the pattern of the stroboscope appears to be stationary for it leaut 30 seconds. The indicators ohould read approximately 9.52 percent and thdr pointers should remain stationary as long as the stroboscope pattern remains stationarj ?he shove pmcedure shal be repeated at each 400 RPYI

35、 from 400 RFM to 4400 61py and including 4600 Rpy indicated speed. The tachometer indicator readinga shall be compared withthoee marked with an asterisk in Table I of Specification MILI-5573. 4.4.5 Temperature.- The stroboscope lamp and ignition equipment shall be tested for satisfactory operation a

36、t 10% and 35.C. 4.4.6 Rejection and Retest.- Itema which have been reJected may be Mirorked or replaced to correct the defects and resubmitted for acceptance. Before resubmitting, hill particularr concerning previous rejection and the action taken to correct the defects found in the original ahall b

37、e furnished the Inspector. Units rejected after retest shall not be resutrpitted rithout specific approval of the Procuring Activity. The control 5. PREPARATION FOR DELIVERY 5.1 Application.- The packaging, packing and marking requirements specified herein apply Each tachometer tester shall be prese

38、rved in accordance No preservation compound shall only to direct purchases by or direct shipments to the Covemeat. with the requiremaits of Yethod lA of Specification JAN-P-116. be required. cushioning so as to prevait mechanical damage during handling. 5.2 Preservation and Packadw.- 5.3 Cushionin E

39、NGINE TACHWETER Specification ibIL-T-86W ( Aer) 5.5.1 The following precautionary marking shall appear ai tno opposite sides of each unit .package, whenever practicable, depending on the size of the container: FRAGILE DELICATE INSTRUMENTS HANDLE dITH CAN Provided by IHSNot for ResaleNo reproduction

40、or networking permitted without license from IHS-,-,-MIL-T-8688 66 7979906 0326757 7 MILT- 8688 (Aer) 6. IWTB 6.1 Intendod Use.- TachoPieter testers are intended for we in cdibrating and checking the accuracy of high-grade aircraft engine tachometere, number and date of tke apecification, the quanti

41、ty desired, requirements for the indicator panel (see paragraph 3.5.5), and whether overseas packing, and type of preservation i8 desired. The attention of contractors is invited to the fact that the accuracy of. test speeds must exceed tho accuracy of the instruments under test. the accuracy of the

42、 tuning fork should be within 0.01 percent at 60 cycles. test equipment must not change with almost continuous use. 6.2 Orderitin Dmta.0 Requisitions, contracts and orders should specify the title, 6.3 Accuracy.- In this connection The accuracy of XOTICE: other data are used for any purpose other th

43、an in connection with a definitely releted Govermient procurement operation, the United States Government thereby incurs no responsibility nor any obligation rihatsoever; and the fact that the Government may have forniulated, furnished, or in any nay supplied the said drawings, specifications, or ot

44、her data is not to be regarded by implication or othcrsiise as in any manner licensing the holder or any other person or corporition, or conveying any rights or permission to manufacture, use, or sell my patented invention that may in any way be related thereto. When Government draxings, specifications, or 8 Q Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-