1、MIL-STD-20bB CHG NOTICE 2 D LL 0434978 630 D NOT MEASUREMENT 1 SENSITIVE 1 MIL-STD-206B 1 January 1988 SUPERSEDING 10 March 1959 MIL-STD-206A PART 1 and MIL-STD-206A PART 2 10 March 1959 MILITARY STANDARD FRICTION TORQUE TESTING FOR BEARINGS, BALL, ANNULAR INSTRUMENT TYPE ASC N/A FSC 3110 DISTRIBUTI
2、ON STATEMENT A. Approved for pub1 ic re1 ease; distribution is un1 imited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-20bB CHG NOTICE 2 m 77777LL 0434777 7T4 m I I NOT MEASUREMENT 1 SENSITIVE MIL-STD-206B NOTICE 2 26 July 1993 MILITARY S
3、TANDARD FRICTION TORQUE TESTING FOR BEARINGS, BALL, ANNULAR (INSTRUMENT TYPE) TO ALL HOLDERS OF MIL-STD-206B: 1. THE FOLLOWING PAGES OF MIL-STD-206B HAVE BEEN REVISED AND SUPERSEDE THE PAGES LISTED: NEW PAGE DATE SUPERSEDED PAGE DATE Cover 26 July 1993 Cover O1 January 1988 II II II II ii ii 1 2 3 1
4、1 II II II 1 2 3 4 O1 January 1988 4 REPRINTED WITHOUT CHANGE 26 July 1993 5 O1 January 1988 O1 January 1988 6 REPRINTED WITHOUT CHANGE 2. RETAIN THIS NOTICE AND INSERT BEFORE TABLE OF CONTENTS. 3. indicated above have been entered. check sheet. publication. military standard is completely revised o
5、r canceled. Holders of MIL-STD-206B will verify that page changes and additions This notice page will be retained as a This issuance, together with appended pages, is a separate Each notice is to be retained by stocking points until the Custodians: Army - AT Navy - AS Air Force - 99 Review activitie
6、s: DLA - IS Preparing activity: Navy - AS (Project 3110-0898) AMSC N/A FSC 3110 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. O Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-20bB CHG NOTICE 2 W 99979LL 04
7、34979 577 D MIL-STD-206B DEPARTMENT OF DEFENSE Washington , DC 20301 Friction Torque Testing for Bearings, Ball, Annular (Instrument Type) 1. of the Department of Defense. This military standard is approved for use by all Departments and Agencies 2. Beneficial comments (recommendations, additions, d
8、eletions) and any pertinent data which may be of use in improving this document should be addressed to: Commanding Officer, Naval Air Warfare Center Aircraft Division Lakehurst, Systems Requirements Department (Code SR3) , Lakehurst , NJ 08733- 5100, by using the self-addressed Standardization Docum
9、ent Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. ii Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-7 I MIL-STD-2068 33 7777733 0033086 7 = 1 I Paragraph 1. 1.1 1.2 1.3 1.4 2. 2.1 2.1.1 2.2 3. 3.1 3.2 3.3 3.
10、4 3.5 3.6 3.7 3.8 3.9- -3.10 3.11 MIL-STD-PO6B CONTENTS Page REFERENCED DOCUMENTS - - - - - - - - - 1 Government documents - - - - - - - - - 1 Specifications and standards - - - - - 1 Order of precedence 1 - - - - - - - - - 4. GENERAL REQUIREMENTS - - - - - - - - - 2 4.1 Ambient conditions - - - - -
11、 - - - - - 2 4.2 Pretest condition of bearings - - - - 2 . 4.32 Test .load vs. bearing size - - - - - - 3 L 1 5. . DETAIL REQUIREMENTS - - - - - - - - - - 3 4.3 Test loading - _ _ _ - - - -_ - - - 3 4.3.1 Torque testing loads - - - - - - - - - 3 I - 4.3.3 Test load application - - - - - - - - 3 I 5.
12、1 5.1.1 5.1.1.1 5.11.1.2 5.1.1.3 5.1 .I .4 5.1.1.5 5.1.1.6 5.1.1.7 5.1.2 5.1.2.1 5.1.2.2 5.2 5.2.1 Starting torque 3 Extent of -testing 3 Ambient vibration - - - - - - - - - - 4 Acceptance testing - - - - - - - - - - 4 Bearing mounting - - - - - - - - - - - 4 Torque transmitter - - - - - - - - - - 4
13、 Cycle testing 4 4 Calibration standard - - - - - - - - - 4 400 gram load 4 Running torque - - - - - - - - - - - - 4 Test equipment parameters - - - - - - 4 - - - - - - - - - - - - - - - - - - - - - Test cycle -_- 3 - - - - - - - - - - - - Retest - - - - - - - - - - - - - - - 75 gram load - - - - -
14、- - - - - - - 4 - - - - - - - - - - - - i-i i I . , . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Figure 1 MIL-STD-20bB 3L 77777LL OOL3O7 7 MI L-STD-206B CONTENTS - Continued. 5.2.1.1 5.2.1.2 5.2.1.3 5.2.1.4 5.2.1.5 5.2.1 .S 5.2.1.7 5.2.1.8 5.2.1
15、.9 Test equipment - - - - - - - - - - - - 4 Test length - - - - - - - - - - - 4 Test load _-_-I-_- 5 Amplitude and response - - - - - - - - 5 Recorder sensitivity - - - - - - - - - ti Bearing RPM - - - - - -_ - - - - 5 3 Torque capacity 5 Critical parameters - - - - - - - - - 5 Torque measurement -
16、- - - - - - - - - - - - - - - - - - - - 6. 6.1 NOTES - - - - - - - - - - - - - - - - - Intended use - - - - - - - - - - - - - 5 5 6.2 Supersession data - - - - - - - -.- - 5 6.3 Subject term (key word) listing - - - 5 6.4 Changes from previous Issue - - - - - 5 FIGURE t Quantitative parameters of th
17、e running torque of a bearing - - - - - - - - - 6 . i v I- - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-20bB CHG NOTICE 2 H 9999911 0434980 299 MIL-STD-206B 1. SCOPE 1.1 Scope. This standard contains requirements for the friction torque
18、testing of instrument type, annular ball bearings. Guidelines for running and starting torque tests and testers are established. 1.2 Purpose. The purpose of this standard is to establish basic guidelines for starting and running torque tests and testers to allow correlation of test results between d
19、ifferent facilities. 1.3 AoDlication. This standard applies to the method of evaluating low torque instrument ball bearings, including, but not limited to, gyroscope gimbal rings and servo systems. This standard covers mini ature bal 1 bearings as well as all general types of ball bearings in both t
20、he inch series and the metric series with torque limits under 20,000 mg-mm. 1.4 Coveraqe. This standard covers test conditions, measurements, analysis and extent of testing. 2. REFERENCED DOCUMENTS 2.1 Government documents. 2.1.1 SDecifications and standards. The following specifications and standar
21、ds form a part of this document to the extent specified herein. otherwise specified, the issue of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation. SPECIFICATIONS Unless MI ITAR
22、Y MIL-L-6085 - Lubricating Oil, Instrument, Aircraft, Low Volatility. DOD-L-81846 - Lubricating Oil, Instrument, Ball Bearing, High Flash Point. STANDARDS FEDERAL FED-STD-209 - Clean Room and Work Station Requirements, Controlled Environment . (Unless otherwise indicated, copies of federal and milit
23、ary specifications and standards are available from DODSSP-Customer Service, Standardization Document Order Desk, 700 Robbins Avenue, Bldg. 40, Phil adel phi a, PA 19111-5094. ) of this standard and the references cited herein, the text of this standard 2.2 Order of wecedence. In the event of a conf
24、lict between the text shall take precedence. O Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-STD-2066 CHG NOTICE 2 999993L 0434983 125 MIL-STD-206B 3.1 Averaqe hash. The average predominant bandwidth recorded (measured with the test of the bea
25、ring in any one direction) (see Figure 1). 3.2 Averaqe runninq torque. The sum of the absolute value of running torque in both clockwise and counterclockwise directions divided by two (see Figure 1). 3.3 Axis position. Axis position is defined as the angular position of the rotation of the bearing w
26、ith respect to vertical. 3.4 Maximum hash. The maximum peak-to-peak value of torque variations recorded during clockwise or counterclockwise testing of the bearing, excluding torque excursion (see Figure 1). 3.5 Peak runninq torque. The maximum torque recorded during the torque trace from zero torqu
27、e, either during clockwise or counterclockwise testing of the bearing (see Figure 1). 3.6 Ramp speed. to maximum cal i brated torque. The amount of time it takes to go from a static state 3.7 Runnins torque. The torque required to continue rotation of an already rotaiing bearing. to centerline avera
28、ge of the torque trace. Determined by the amount of torque from zero torque 3.8 Startinq torque. Starting torque is the applied torque necessary to start and maintain rotation for a prescribed arc of travel of the rotated raceway member with the other raceway member held stationary unless otherwise
29、speci fi ed. 3.9 Standard toraue unit. The standard torque unit of measurement for precision instrument bearings shall be a milligram-mill imeter (mg-mm). 3.10 Test load. The test load is a specified axial load applied coincident with the axis of rotation of the bearing. 3.11 Toraue excursion (wande
30、r). A gradual change in running torque, sometimes an individual event returning to the original torque level, at others cyclic (sinusoidal) by nature (see Figure 1). 4. GENERAL REQUIREMENTS 4.1 Ambient conditions. Testing shall be conducted in an atmosphere- controlled clean environment in accordanc
31、e with FED-STD-209, Class 10,000 or better. Temperature shall be maintained within 68 to 77F and relative humidity between 30 and 50 percent. 4.2 Pretest condition of bearinqs. Unless otherwise specified before testing, bearings shall have been demagnetized and cleaned thoroughly with clean solvents
32、 filtered through a 0.5 micron or better filter. cleaning, bearings shall be lubricated in accordance with Table I unless an alternate lubrication method is specified. The oil used for torque testing shall be light instrument oil having a viscosity not exceeding 14 cs After 2 Provided by IHSNot for
33、ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-20bB CHG NOTICE 2 m LL 043q82 Ob1 m Bearing 0.0. Less than 0.6250 inch Equal to or greater than 0.6250 inch MIL-STD-2O6B Amount of Oil I/ 1 drop 2 drops (centistrokes) at 100F, and shall be filtered through a 0.45 mic
34、ron filter. After the lubricant is applied, the bearing shall be rotated slowly prior to test to distribute the oil evenly. Unless otherwise specified, MIL-L-6085 oil or DOD-L-81846 oil shall be used. TABLE I. Lubrication of bearinas. 4.3 Test loadinq. 4.3.1 Torque testinq loads. Two test loads shal
35、l be specified as standards. They are 75 grams and 400 grams. * 4.3.2 Test load vs. bearinq size. Unless otherwise specified, the 75 gram test load shall be used for all bearings with an outside diameter of 0.3750 inch or less. The 400 gram test load shall be used for bearings with an outside diamet
36、er greater than 0.3750 inch. 4.3.3 Test load amlication. The test loads shall be applied axially with the bore of the bearing in a vertical position unless otherwise specified. 5. DETAILED REQUIREMENTS 5.1 Startinq toraue. 5.1.1 Extent of testinq. 5.1.1.1 Text cvcle. Unless otherwise specified, the
37、test cycle shall be as shown in Table II. TABLE II. Test cvcle. Non-Flanqed Bearinqs. a. 5 consecutive starts clockwise b. 5 consecutive starts counterclockwise c. Turn bearing over d. Repeat steps a and b above 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license f
38、rom IHS-,-,-MIL-STD-20bB CHG NOTICE 2 99999LL 0434983 TT8 MIL-STD-206B TABLE II. Test cycle - Continued F1 anaed Beari nas Stem a and b above onlv 5.1.1.2 Ambient vibration. Ambient vibration shall be less than the point at which it will interfere with or affect the starting torque trace, with the r
39、ecorder set at the proper level of sensitivity for the bearing under test. is available, the vibration shall be less than the point where it will affect the test resul ts. If no recorder 5.1.1.3 Acceptance testinq. The bearing undergoing acceptance testing shall be tested in accordance with 4.2. 5.1
40、.1.4 Bearina mountinq. The bearing shall be mounted with the spin axis of the bearing vertical and axially loaded in a fixture which is capable of receiving a calibrated amount of torque. 5.1.1.5 Torque transmitter. The torque transmitter may be of various designs but shall be capable of applying a
41、minimum calibrated torque of 15,000 mg-mm accurate within 10 percent at operating range. applying a torque which starts at a static state and slowly increases to maximum calibrated torque. The transmitter shall be capable of The ramp speed shall be 14 f 2 seconds. 5.1.1.6 Cycle testinq. The bearings
42、 shall have started rotation by the time The angle of rotation shall the transmitter has reached maximum calibrated torque. be not less than 30“. The transmitter shall then return to static state and the bearing be allowed to stop without operator intervention. 5.1.1.7 Retest. A bearing test lot fai
43、ling to meet all criteria established above shall be rejected. or recleaned and retested in accordance with 4.2. The test lot may then be tested 100 percent for acceptance 5.1.2 Calibration standard. 5.1.2.1 75 qram load. When using a 75 gram axial load, the calibrator shall 5.1.2.2 400 aram load. W
44、hen using a 400 gram axial load, the calibrator 5.2 Runninq torque. permit a readout in increments of 50 mg-mm per minor division or less. shall permit a readout in increments of 100 mg-mm per minor division or less. 5.2.1 Test eauicment parameters. 5.2.1.1 Test eauiment. The test equipment shall be
45、 capable of testing a bearing with an outside diameter of not greater than 30 millimeters, excluding the f 1 ange. 5.2.1.2 Test lenath. The test length shall be a minimum of one full rotation in each direction. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license fr
46、om IHS-,-,-MIL-STD-20bB CHG NOTICE 2 = 99999LL 0434984 934 MI L-STD-206B 5.2.1.3 Test load. The load of the bearing under test shall be applied axially (see 4.3.1, 4.3.2 and 4.3.3). 5.2.1.4 AmDlitude and response. The amplitude and response of the transducer shall be flat within 1 dB to a minimum of
47、 40 Hz. The system amplitude and response shall be flat within 1 dB to a minimum of 5 Hz. 5.2.1.5 Recorder sensitivity. The minimum recorder sensitivity shall be 100 mg-mm per minor division. 5.2.1.6 Bearins RPM. The rpm of the bearing under test shall be set between 0.5 and 2.0 rpm unless otherwise
48、 specified and will be of constant speed. 5.2.1.7 Toraue measurement. Torque shall be measured by either inner or outer ring rotation of the bearing. 5.2.1.8 Toraue caDacitv. The torque measuring system shall have a 5.2.1.9 Critical Darameters. Critical equipment parameters as they torque capacity o
49、f not less than 20,000 mg-mm. pertain to this document shall be maintained. 6. NOTES 6.1 Intended use. This standard provides procedures for testing ball bearings in order to determine their torque values. document is to provide a standard whereby uniformity of torque measurement can be obtained for precision instrument bearings. and 2. The intent of this 6.2
