1、MIL- SlD-408A 8 December 1940 SUPERSEDING MI 1-STD-408 28 June 1957 (SHIPS) 13 June 1958 MIL-1-001 5459E MILITARY STANDARD BRUSHES, ELECTRICAL CONTACT RECTANGULAR, STANDARD DESIGNS AND DIAAIENS1ONS FOR UNITED STATfS OOVERNMENT PRINTING OFFICE WASHINGTON : 960 Licensed by Information Handling Service
2、sI i ARMED FORCES SUPPLY SUPPORT CENTER Washington 25, D.C. Brushes, Electrical Contact, Rectangular, Standard Designs and Dimensions for hlIGSTD-408A 1. This standard has been approved by the Department of Defense and is mandatory for use by the Departments of the Army, the Navy, and the Air Force
3、effective. 2. In accordance with established procedure, the Corps of Engineers, Bureau of Ships, and Air Force, respectively, have been designated Army-Navy-Air Force custodians of this standard. 3. Recommended corrections, additions, or deletions should be addressed to the Standardization Division,
4、 Armed Forces Supply Support Center, Vasliington 25, D. C. ii Licensed by Information Handling Services, INTRODUCTION (a) This standard corresponds in general, but not in detail, to the U. S. Department of Commerce Simplified Practice Recommendation R56-35, Standard MS91000, ASA Publication No. C4.
5、1-1956 and NEMA No. CB 1-1956. In addi- tion lo being used for the design of brushes it is also intended to hold to a minimum the number of designs and sizes of brush holders. -_ (b) The brush form designations nppearing in this standard are based on interchangeability. For example, the brush form d
6、esignation remaina the same regardless of whether the terminal lug is type S (slot) or H (hole) as long as the terminal lug ia suitable for a screw of some certain diameter. (c) This standard does not cover grades of brushes or tests. Top and bottom bevcls, however, which appear in this standard are
7、 based on coefficients of friction not exceeding 0.50 for electrographitic grades, 0.45 for graphitic grades and 0.40 for copper-graphitic grades. iii Licensed by Information Handling Services MIL-STD-9OBA NOTICE L 57 W 77779LL OOOLiLbL 5 W MIL- STD- 408 CHANGE NOTICE 1 26 July 1961 iMILITARY SPECIF
8、ICATION BZUSHEC, ELECTRIC,AL CONTACT, R E C TAN C t LAR, STASDARD DESIGSS AND DIMENSIONS FOR $ 9 Reprinted without change 10 26 July 1961 10 8 December 2, I tandard, Retain this cover page and insert before the table of contenta of this 1960 -1 .- FSC 5977 , ._- Licensed by Information Handling Serv
9、icesflIL-STD-4OBA NOTICE 1 57 7777711 0004162 7 MIL-STWA 1. SCOPE : 1.1 SCOPE . 1.2 CLASS.IFIC.4TIOS . 2. REFEREXCED DOCtllESTS . 2.1 GPECIFICXTIOBS . 3. GESERAL REQI7RE3IEi?5 . b / DEFIXTIOSS . 3.1 3.2 STAKDARD STiZES . 4. DETAIL REQIIRElIEXTS . .:. . 4.1 TYPE T, RECTXKWLAR, BRI-SHES WITH SHLTTS II
10、- -E BCT WITHOVT SPRISGS TYPE II, RECTASGKLAR, YITH SHILTS AA3l SPRISGS ?PE III, RECTAXGILAR, YITH SPRIXGS BLT WITHOVT SHYSTS 4.2 4.3 Fipure 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 FIGURES Bevels Commutator brush . Collector ring brush Standard hammer clip Offset hammer clip . Extra wide hammer
11、 clip Angular hammer clip . Single shoulder Beveled edge Beveled c0rne.r Terminal lugs . Marking Representative style Cl cornmulatar brush., . Double shoulder Representative Ftyle RI collector ring brush., Terminal, routid type, stnmped Terminal, round type, machined . Terminal, eared type . a iv Li
12、censed by Information Handling ServicesMIL-STD-LIOBA NOTICE I 57 m 9777933 0004363 7 m Table I Table II Table III Table IV Table V Table VI Table VI1 Table VI11 Table IX Table X Table XJ Table XII Table XII1 Table XIV Table XV COrnIENTS TABLES Dimensional tolerances for rectangulnr cross-section bru
13、shes. . Width of toe of beveled brushes. . Depth of chamfer . .:. . Shunts for brushes . Designations and dimensions applicable to terminal lugs Standard sizes of style Cl commutator bruehes . Standard sizes of style R, collector ring brushes. Dimensional tolerances for rectangular and square cross-
14、 section brushes Dimensional tolerances for brush heads. Shunts for brushes Stamped, round type terminals . Machined, round type terminals Eared type terminals Standard sizes of brushes having both shunts and springs, . Shunts for standard rectangular brushes with springs. Paga 7 P Licensed by Infor
15、mation Handling ServicesMIL-STD408A 1, SCOPE 1.1 Scope. This standard covers the standard designs and dimensions for rectangular brushes exclusive of those for aero-space applications. Style Mommutator. Style R-Collector ring. Type II-Rectangular, with shunts and Type III-Rectangular, with springs b
16、ut Type IV-Rcctangular, with neither shunis 1.2 Classification, springs. 1.2.1 This standard covers the following types Type 17Rectangular, with shunts but with- , B and styles of brushbs: without shunts. ?, i out springs. nor springs, . 2. REFERENCED DOCUMENTS 2.1 Not applicable. 3. GENERAL REQUIRE
17、MENTS 3.1 Definitions. The following definitions are applicable to this standard: 3.1.1 Length. The length of a brush is the niaxiiiiuni svcrall diniension in the direction in wliicli tlie brush feeds- to the comiiiutator or col- tcctor ring. This is also known as the rndial diiiicnsion. 3.1.2 Width
18、. The width of a brush is the diiiicnsion at right angles to thedengtli and to the direction of rotation. This is also known as the axia I diniension. 3.1.3 Thickness. Thc thickness of a brush is tlic diiiicnsion at riglit angles to the length in the direction of rotntion. This is also known as the
19、tangential diii-icnsion. 3.1.4 Front side. The front side of a brush having onc or botli ends l)cvclcd is tlic aren boundcd by tlic svidtli nnd the shortest length. i 3.1.5 Back side. The back side of a brush having one or botli ends beveled is thc arca bounded by tlie width and the greatest length.
20、 3.1.6 Bevels and tocs. The top bci.el and bot- toiii bcvcl are tlie angles included bctivccii tlie beveled surface and A plane at riglit aiiglcs to the Icngtli. The toe is the uncut or flat portion nl ttie beveled end (see figure i). 3.1.7 Split brush. A split brush is one which consists of two or
21、more pieces ustd in place of a single brush. The adjacent Eides of the split brush pieces are parallel to the commutator slots. 3.1.8 Paired brush. A paired brush is one uliicti consists of two individual brushes which are joined together by a common shunt or termi- nal lug. A paired brush is not a
22、split brush. 3.1.9 Headed brush. A headed brush is one having a top smaller in cross-section than the width times the thickness, The head is usually cylindrical or conical in shape. 3.1.10 Pressur8 condilion i. Pressure condi- tion 1 is the so-called “new-brush” condition on the complete brush assci
23、iibly. 1 3.1.11 Pressure condition 2. Pressure coiidi- tion 2 is the condition after ttie brush has under- gone 100 percent wear. 3.1.12 Brush face. Brush face is tlic end of tlie brush which makes contact with coiiiiiiutntor or collector ring. 3.2 Siqndard siylea. 3.2.1 Type I. Standard stylcs for
24、style C (coiiiiiiutntor) bruslies smnllcr tlinn 112 inches long by : inch wide by n/, inch thick and for 1 I- - Licensed by Information Handling ServicesMIL-STD-gOA NOTICE 1 57 W style R (collector ring) brushes smaller than 1% inches long by 3/8 inch wide by % inch thick will be established by revi
25、sion of this standard. The requirements to be specified shall correspond with those specified in 4.1.13, 4.1.14, 4.1.15 and 4.1.16 herein. 3.2.2 Type II. Standard styles for type II brushes smaller than iliitr nrades coniuiiiinu .M Iwrrcni or iiiurc iiiewt.1 by weight Plus Inch 0.033 .o00 a . . ,016
26、 hlinua Inch * 0.032 .w 1 .oui .o07 .ocm .o00 . TABLE S. SIiictils lor brtishcs. Diameter 01 8irnnds. aoiiiinrl Al ils 2 2 2 2 2 2 3 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 huiiitxr ol atrnnds in carJi iiieiiiber 18 25 11 6 17 22 33 15 50 40 i2 115 15 11 15 22 11 13 15 27 66 100 Minus Inch , . 0.020 .o1 1 ,00
27、4 a .,.I. Niiiiihcr Ul iiieiiitiers 1 1 3 3 3 3 1 7 3 7 7 7 2 3- 3 7 7 7 7 7 7 3$3 4.2.4 Ternlinnls. All terminals shall be Iiot- tinned or silver plated. 4.2.4.1 Types. Terminals shall be as follows (see figures 16, 17 and 18). Licensed by Information Handling ServicesRound typc, stnnpcd. Round tyi
28、)c, iiiacliined. 4.2.4.2 Diiiensons. 012ooO3 4.2.4.2.1 Rmtnd tppc. stomped. The dimen- 0161105 0?015bl 024 1604 t TAELF. SI. Siomped, rouird iypc icrimrtols. kirnition DI % % % w Eared typc. - i Inch 0262U3 aions shall conform to table SI. The terminal shall eonform to figurc 16. 0483208 1 M D2 71 S
29、OTE.-Thr plkn for wtinn up thr dminnitionr undm tililc XI LI as follws Earl) pau of numhrn dmigniia ihr nuiiilwr of niiiifr,urihc of in mrh in ihr appro mair arr m ihr IaIiIr Thw dnirnaiioru borrnpond wit11 lhe SEll.4 full deiinilinni in ASA Publicilk ho %. I-IW, hEblA Publication No CB 1-1956. 42*4
30、*22 Round machined* Th AI ihr lefi ah ihr 1)pt. Irttrn sons shall conforin to taih XII. Tlic terminal, dinirniinn Tlir pain LTt iind up in ihr ulnr order iiir mliimm shall conforni to figure 17. TAEU XII, Machined, round iype ienninoit. DI D2 l- Dmwuiion . I Id I Inch I %6 1% fi % Ti i M IlUh Inch 4
31、,2.4.2,3 Eared tppe. The diinensions shell conform to table SIII. In no case elihll the length of the tcriiiinnl lug cars excecd the solid compressed length o Lhe spring (see 4.2.5). The terminal shall conform to figurv 18. TABLL SIII. Eorcd iype /rminols. . .- . .- . O - ? Licensed by Information H
32、andling ServicesI 4 .O 6.7 8.1 8.4 10.8 13.5 IXrnrnriuni nf hriirh niiirril (in I , inrlii 1 Thick- i Aidih knri h i . Drein- utiun i- - 3.4 5.7 6,Q 8.0 9.2 11.5 .4 5 6 7 8 10 I 12 12 16 16 16 20 4.5 7.5 9.0 10-5 12.0 15.0 12 12 12 12 16 20 18 18 18 24 I 18 I l. TIir nliovc ilivipn3iinn ir hnwrl on
33、cxprndnc in onr-iixircniha of an inch, the ihicknru, width and Inyih in thri ordrr. 1. Ciinrliiiim I rqiri-ii*nt* ihr rontliiiiin illien 111. twurli in nrw. CnRaIiiion 1 rrpwunir ihr nmdiiion whrn ihr hrurh hnr undrmonc l0 pci-rvnl iwflr. iFtv ilir piirpn* 01 tliin tolilc. ihr fo!louinp nrdumpiionn
34、writ nia wnr. 4.2.4.2.4 Tolerances. llie tolerances of the diiiiensions nppcaring in tables XI, XII and XII1 shall bc as follows: Zpplus or ininus 1/64 inch. All otlicrs-plus O.Oo0 inch, ininus 0.008 inch. 4.2.5 Springs. Springs shall be of thc positive gradient, coiiiprcssion, helical wire type. Th
35、ere slioll bc two closcd turns at each end of the spring. 4.2.6 Marking. Each brush shall be marked (a) hfanuacturcrs grade designation. IT posaiblc, this marking shall be placed above the point o 100 pcrccnt wear so that the information is still available when the brush has worn to that point. (b)
36、Indication of points of 75 and 100 per- cent wear. Tlic wear points shall be eo marked that there is a continuous marking between the two pointe of wear along the length of the bni5h. with the following information: 4.2.7 Standard sites. Standard sites for rec- tangular brushes with shunts nnd sprin
37、gs shall TABLC XV. Shunla /or siandad rcciangulor brushe, wih springi. Brwh desirmiion O304 12 O405 I2 O4C516 MO7 16 O408 I6 O4 1020 hfinlmurn pcrrnimiblc rhuni rire rhcm bnuh ciirnnt druity h 60 the tin1 bure nprcrnli ihr nuiillm ni rnimlwn, ilie mond firurr rrpnumia ihr niiiiihn 01 itraniin in rrr
38、li mmk, and ilie third fiKun nprwta ihr 0ami0.l diimrtrr o itrantla in incha. conform to table XIV. The shunts for theue brushes shall conform to table XV. 4.3 Typ m. rctluyglu, with rpriiy kit 4.3.1 Dirnen, and the fact that the Coverument may have formulated, fur- nished, or in any way supplied th
39、e said drawings, npecifi- cationfi. or other data is not to be rgarded by implication or otherwise .u in any manner liceming the holder or any other person or corporation, or conveying any rights or permission to manufacture, use, or sell any patented invention that may in any way be relnted thereto
40、. PreparinN activity; N.VY-BUIWU of Ship# (Project 5977-0003) I 11 Licensed by Information Handling ServicesFICCRE 1 .-Dcuets. 3 456 9 SH 832 FIG c RE 2.-Co ni ni II lo lor b riish, MIL-STD-408A 13 Licensed by Information Handling ServicesMIL-STD-408A MIL-STD-qOA NOTICE I 57 7777333 OOOLI376 7 II SH
41、 833 RGURE 3.-Colleclor ring brush. 13 IO I2 RCURE 4.-Slandard harnmcr clip. SH 835 FICCRE 5,-01sc1 harnmcr dip. 14 Licensed by Information Handling ServicesMIL-STD-408 A Ski 36 FICVRE 6,-Eilra wide hammer clip. SH 038 FICCRC I.-Angular hammer clip. SI4839 FICVFLS 8Aitigle shoulder. 15 Licensed by I
42、nformation Handling ServicesMIL-STD-4OA NOTICE 3 57 7777733 0004378 O Mll-STD408A SH840 Fiauan 8.-Double shoulder. FIGURE lO.-Beueicd edge. SH 842 I.icvt: ii.-Oevclcd corner. 16 Licensed by Information Handling Services, _ - mIL-STD-40A NOTICE 3 57 7777733 0004379 2 MIL-STD-408A I 7- B k.00 I .i I I
43、 L CH 3u Type FH (fbg type i wlth hole). FA=- +- npe H (stralght type wlth hole). rt4 Type S (stralght type with slot). Type TS (tubular type with slot). 17 L . . , Licensed by Information Handling Services-. . - . - MIL-STD-LlOA NOTICE I 57 W Y779YLL 0004LBO Y W MIL-STD-408A l- Shunt JWEARING uURFA
44、OE AT POINT OF 100%WEAR -LINES OR ROOVES .WEARIN 8URFAGE AT POINT OF 70% OF WEAR j-WEARINQ SURFAOE OF 18 : Licensed by Information Handling ServicesMIL-STD-qOA NOTICE 1 57 M 777771L 0004LL O M MIL-STD-408A FICWN: 14.-Rc/rcsctiiniitc siylc C, cotrirnirLalor bruah. i9 Licensed by Information Handling
45、ServicesMIL-STD-40A NOTICE I 57 W 79779LI 00042E 2 = Mll-STD-408A- 20 Licensed by Information Handling Services1-t SH847 LD2-i FIOVRE li.-Terminal, round lype, machined. 21 Licensed by Information Handling ServicesMIL Sf408A -wl SH 848 -1 . . PICUEIE 18.-Termiiial, eared type. Licensed by Information Handling Services
