ANSI PH3.108-1988 摄影(附件).锁定肋材型双胶片夹持器的尺寸
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来源:标准资料网
【英文标准名称】:Photography(Accessories)-DoubleFilmHoldersoftheLock-RibType-Dimensions
【原文标准名称】:摄影(附件).锁定肋材型双胶片夹持器的尺寸
【标准号】:ANSIPH3.108-1988
【标准状态】:作废
【国别】:美国
【发布日期】:1988
【实施或试行日期】:
【发布单位】:美国国家标准学会(ANSI)
【起草单位】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:夹(架);摄影技术;尺寸;附件
【英文主题词】:accessories;holders;dimensions;phototechnology
【摘要】:
【中国标准分类号】:N46
【国际标准分类号】:37_040_10
【页数】:3P;A4
【正文语种】:英语
Product Code:SAE AMS5623
Title:Steel Bars and Forgings, High Expansion, 9.5Ni - 5.5Mn (0.55 - 0.65C), Annealed (NONCURRENT)
Issuing Committee:Ams E Carbon And Low Alloy Steels Committee
Scope:This specification covers a high-expansion steel in the form of bars, forgings, and forging stock.【英文标准名称】:StandardTestMethodforDeterminationoftheBreakawayFrictionCharacteristicsofRollingElementBearings
【原文标准名称】:测定滚动体轴承破裂摩擦特性的标准试验方法
【标准号】:ASTMG182-2006
【标准状态】:现行
【国别】:
【发布日期】:2006
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:G02.50
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:轴承;测定;元件;摩擦;滚动轴承;滚动体;试验
【英文主题词】:coefficientofrollingfriction;frictiontesting;rolling;rollingfriction
【摘要】:Thistestisasimple,effectivewayofdeterminingtheabilityofbearingstorollfreely.Mostbearingmanufacturersdonotsupplyinformationonthebreakawayfrictioncoefficientoftheirproductsandifthisisadesignfactor,usersoftenbuycandidatebearingsandtrythemuntiltheyfindonethatappearstooperatefreerthantheothers.Thistestallowsquantificationofthebreakawayfrictioncharacteristicsofbearings.Thistestassessesthefrictionofabearingasatribosystemwhichincludesitsconstructionandlubrication.Ithasshowntocorrelatewithuse.Ifabearinghasalowbreakawayangleinthistest,itsbreakawayfrictionwillbelowerinservicethanthesamesizebearingsthatdisplayedahigherbreakawayangleinthistest.Breakawayfrictionofbearingsisimportantininstrumentswhereforcesarelightandthebearingsareusedaspivotsratherthanforcontinuedrotation.Lowfrictionisoftenimperativeforproperdeviceoperation.Bearingswithlowbreakawayfrictionareoftensoughtforwebhandlingrollers.Manyrollersaredrivenonlybytangentialwebcontactandslippagecanoftendamagetheweb.Lowfrictionbearingsarerequired.Thistestisusefulforscreeningbearingsforanyapplicationswherebreakawayfrictionisadesignconcern.1.1ThistestmethodisanextensionofTestMethodG164andusesaninclinedplaneandapaperclipridertodetectthepresenceorabsenceoflubricantsonthesurfacesofflexiblewebs.Astudytoidentifyfreespinningorlowrollingfrictionbearingsindicatedthatthepaperclipfrictiontestcouldbeusedforrollingfrictionbysimplyreplacingthepaperclipwitharollingelementbearingonanaxle.Theangleoftheinclinedplaneatinitiationofrollingisthebreakawayangle.Thistestmethodcanbeusedtomeasuretheangleatbreakawayofsmalldiameter(upto100mmoutsidediameter)rollingelementbearings.Thebearingsthathavebeentestedinthedevelopmentofthismethodareconventionalballbearingswithdifferentseparators,seals,anddifferentconditionsoflubrication(none,oil,greases,andsoforth),butthereisnotechnicalreasonwhythistestmethodwouldnotworkwithbearingsofotherdesign,includingplainbearings.Rollingelementbearingslikeanyslidingsystemcanhavefrictioncharacteristicsatbreakawaythataredifferentthanrollingcontinuously.Asisthecasewithmostinclinedplanefrictiontests,thetestonlyproducesthefrictioncharacteristicattheonsetofmeasurablerolling,usingtheangle()whenmeasurablerollingcommences.Theobjectiveofthistestisanassessmentofbreakawayrollingfrictioncharacteristicstoassistmachinedesignersintheselectionofrollingelementbearingsforinstrumentpivotsandthelikewherebreakawayfrictionisaconcern.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:J11
【国际标准分类号】:21_100_20
【页数】:5P.;A4
【正文语种】:
