methods of measurement to determine the pitch diameter of thread ring gages presents serious difficulties, particularly in securing proper contact pressure when a high degree of precision is required. The usual practice is to fit the ring gage to a master setting plug.
When the thread ring gage is of correct lead, angle, and thread form, within close limits, this method is quite satisfactory and represents standard American practice. It is the only method available for small sizes of threads. For the larger sizes, various more or less satisfactory methods have been devised, but none of these have found wide application.
用测量法来决定螺纹环规的螺纹中径出现了一些严重的问题, 特别是当要求高精度的时候，还难保证适当的接触压力. 常规的做法是把环规装到一个主定位塞里面. 如果这个螺纹环规的导程，角度正确及牙形在精密的极限范围内，那么这种方法是非常令人满意的, 代表了美国的标准做法. 这也是针对小螺纹的唯一方法. 对于大一点的螺纹, 有各种各样的方法，这些方法或多或少有些可取之处，但是无一能得到应运广泛.
Screw Thread Gage Classification.—Screw thread gages are classified by their degree of accuracy, that is, by the amount of tolerance afforded the gage manufacturer and the wear allowance, if any. 螺纹规的分类----螺纹规根据精确程度(也即螺纹规的制造商所能提供的公差范围及磨损留量(如果有这个留量的话) 不同分为不同类别,
There are also three classifications according to use: 1) Working gages for controlling production; 2) inspection gages for rejection or acceptance of the finished product; a n d 3) reference gages for determining the accuracy of the working and inspection gages.
根据用途的不同有三种分类:1)用来控制生产的生产量规;2)用来判断成品是可以接受还是拒绝的检验量规;3)用来确定生产量规与检验量规的精确性的参考规.
American National Standard for Gages and Gaging for Unified Inch Screw Threads
ANSI/ASME B1.2-1983 (R1991).—This standard covers gaging methods for conformance of Unified Screw threads and provides the essential specifications for applicable gages required for unified inch screw threads.美国国家标准对统一英寸螺纹的测定与量规的规定ANSI/ASME B1.2-1983 (R1991).这个标准覆盖了统一螺纹一致性的测量方法并提供了用于统一螺纹的量规的关键规格.
The standard includes the following gages for Product Internal Thread:
这个标准包括用于产品内螺纹的如下量规.
GO Working Thread Plug Gage for inspecting the maximum-material GO functional limit.
通规生产量规是用于检查通端的最大实体作用极限.
NOT GO (HI) Thread Plug Gage for inspecting the NOT GO (HI) functional diameter limit.
止规螺纹塞规是用于检查止端的有效直径极限.
Thread Snap Gage—GO Segments or Rolls for inspecting the maximum-material GO functional limit.
螺纹卡规---通端是用于检查通端的最大实体作用极限.
Thread Snap Gage—NOT GO (HI) Segments or Rolls for inspecting the NOT GO (HI) functional diameter limit.
螺纹卡规---止端是检查止端的有效直径极限.
Thread Snap Gages—Minimum Material: Pitch Diameter Cone Type and Vee and
Thread Groove Diameter Type for inspecting the minimum-material limit pitch diameter.
螺纹卡规—最小材料：中径为锥形及V形及螺纹为凹槽形的直径，是用于检查最小材料极限的中径.
Thread-Setting Solid Ring Gage for setting internal thread indicating and snap gages.
螺纹调整实体环规, 是为了调整内螺纹指示规及卡规.
Plain Plug, Snap, and Indicating Gages for checking the minor diameter of internal threads.
普通塞规, 卡规及指示规是为了检测内螺纹的小直径.
Snap and Indicating Gages for checking the major diameter of internal threads.
卡规及指示规是为了检查内螺纹的大直径.
Functional Indicating Thread Gage for inspecting the maximum-material GO functional limit and size and the NOT GO (HI) functional diameter limit and size.
功能指示螺纹规是为了检验通端的最大材料限度及大小及止端的有效直径限度及大小.
Minimum-Material Indicating Thread Gage for inspecting the minimum-material limit and size.最小材料指示螺纹规是为了检验最小的材料限度及大小.
Indicating Runout Thread Gage for inspecting runout of the minor diameter to pitch diameter. 指示螺纹尾部的螺纹规是为了检验最小直径的螺纹尾部到螺纹中径.
In addition to these gages for product internal threads, the Standard also covers differential gaging a
nd such instruments as pitch micrometers, thread-measuring balls, optical comparator and toolmaker's microscope, profile tracing instrument, surface roughness measuring instrument, and roundness measuring equipment.
除了这些测量产品内部螺纹的量规之外，这个标准还涉及了不同的测量方法及仪器，如螺距千分尺，测量螺纹的球, 光学比较仪, 精密工具制造者用的显微镜, 剖面扫描图仪, 表面粗糙度测量仪, 及圆度测量仪.
The Standard includes the following gages for Product External Thread:
这个标准还包含用于产品外部螺纹的下列量规.
GO Working Thread Ring Gage for inspecting the maximum-material GO functional limit.
通规生产螺纹环规是用于检测通端的最大实体作用极限.
NOT GO (LO) Thread Ring Gage for inspecting the NOT GO (LO) functional diameter limit.
止规螺纹环规(LO)是用于检测止端的有效直径极限
Thread Snap Gage—GO Segments or Rolls for inspecting the maximum-material GO functional limit.
螺纹卡规----通端是检查通端的最大实体作用极限.
Thread Snap Gage—NOT GO (LO) Segments or Rolls for inspecting the NOT GO (LO) functional diameter limit.
螺纹卡规—止端是为了检测止端的作用直径极限.
Thread Snap Gages—Cone and Vee Type and Minimum Material Thread Groove Diameter Type for inspecting the minimum-material pitch diameter limit.
螺纹卡规—圆锥形及V字形及最小实体的螺纹沟槽直径形, 用于检查螺距直径的最小实体中径极限.
Plain Ring and Snap Gages for checking the major diameter. 普通环规与卡规是为了检测大径. Snap Gage for checking the minor diameter. 卡规是用于检测小径
Functional Indicating Thread Gage for inspecting the maximum-material GO functional limit and size and the NOT GO (LO) functional diameter limit and size.
功能螺纹指示量规是为了检查通端的最大实体极限及尺寸及止端的有效直径极限及尺寸.
Minimum-Material Indicating Thread Gage for inspecting the minimum-material limit and size.最小实体螺纹指示量规示用来检测最小实体极限及尺寸.
Indicating Runout Gage for inspecting the runout of the major diameter to the pitch diameter.
指示螺纹尾部的量规是用来检验大径的螺纹尾部到螺纹中径.
W Tolerance Thread-Setting Plug Gage for setting adjustable thread ring gages, checking solid thread ring gages, setting thread snap limit gages, and setting indicating thread gages.
W公差的螺纹调整塞规，是用来调整可调螺纹环规, 检查实体螺纹环规，调整螺纹卡住极限的量规及调整指示螺纹量规.
Plain Check Plug Gage for Thread Ring Gage for verifying the minor diameter limits of thread ring gages after the thread rings have been properly set with the applicable threadsetting plug gages.
用于螺纹环规的普通检查塞规是用来校验螺纹环规在用可调的塞规调整后的小径限度.
Indicating Plain Diameter Gage for checking the major diameter.
普通直径指示量规是用来检验大径.
Indicating Gage for checking the minor diameter.指示规是用来检查小径.
In addition to these gages for product external threads, the Standard also covers differential gaging and such instruments as thread micrometers, thread-measuring wires, optical comparator and toolmaker's microscope, profile tracing instrument, electromechanical lead tester, helical path attachment used with GO type thread indicating gage, helical path
analyzer, surface roughness measuring equipment, and roundness measuring equipment.The standard lists the following for use of Threaded and Plain Gages for verification of product internal threads:
除了这些测量产品外部螺纹的量规之外，这个标准还涉及了不同的测量方法及仪器，如螺纹千分尺，测量螺纹的金属线, 光学比较仪, 精密工具制造者用的显微镜, 剖面扫描图仪, ，机电导程检测器, 与通规螺纹指示规一起用的螺旋状路径附加装置, 螺旋状路径分析器, 表面粗糙度测量仪, 及圆度测量仪.这个标准列出了下列信息以便用螺纹普通量规检验产品内螺纹.
Tolerance: Unless otherwise specified all thread gages which directly check the product thread shall be X tolerance for all classes.
公差: 除非另有说明, 直接检查产品螺纹的所有螺纹量规的公差在所有等级都是X.
GO Thread Plug Gages: GO thread plug gages must enter and pass through the full threaded length of the product freely. The GO thread plug gage is a cumulative check of all thread elements except the minor diameter.
通规螺纹塞规：通规螺纹塞规必须能自由地进入并通过产品的整个螺纹长度. 这个通规螺纹塞规是一个对所有螺纹部分,(除小径之外)的一个累积检查.
NOT GO (HI) Thread Plug Gages: NOT GO (HI) thread plug gages when applied to the product internal thread may engage only the end threads (which may not be representative of the complete thread). Entering threads on product are incomplete and permit gage to start. Starting threads on NOT GO (HI) plugs are subject to greater wear than the remaining threads. Such wear in combination with the incomplete product threads permits further
entry of the gage. NOT GO (HI) functional diameter is acceptable when the NOT GO (HI) thread plug gage applied to the product internal thread does not enter more than three complete turns. The gage should not be forced. Special requirements such as exceptionally thin or ductile material, small number of threads, etc., may necessitate modification of this practice.
止规螺纹塞规(HI): 止规螺纹塞规(HI)在检验产品内螺纹时可能会只与末端螺纹配合(末端螺纹也许并能
不代表完整的螺纹). 与产品上的螺纹配合是不完整的, 允许塞规转动.
在止规塞规上转动螺纹主要取决于更大的磨损，而不是剩余的螺纹. 这些磨损加上产品上不完整的螺纹允许塞规进一步进入螺纹. 当止规塞规应用到产品内螺纹上时不能进入三个以上完整的齿时止端有效直径是可以接受的. 这个塞规不能强行转入. 如果有特殊要求，比如特别薄或柔软的材料，螺纹扣数很小，等等, 可能必须重新修正这个检测方法.
securing
GO and NOT GO Plain Plug Gages for Minor Diameter of Product Internal Thread: (Recommended in Class Z tolerance.) GO plain plug gages must completely enter and pass through the length of the product without force. NOT GO cylindrical plug gage must not enter. The standard lists the following for use of Thread Gages for verification of product external threads:
用于产品内螺纹小径的通规与止规普通塞规(在Z等级公差中推荐了这个). 通规普通塞规必须在没有用强制力的情况下完全进入并通过产品的螺纹长度. 止规缸径规必须不能进入. 这个标准
列出了如下信息以便使用螺纹量规来检验产品的外螺纹.
GO Thread Ring Gages: Adjustable GO thread ring gages must be set to the applicable W
tolerance setting plugs to assure they are within specified limits. The product thread must freely enter
the GO thread ring gage for the entire length of the threaded portion. The GO thread ring gage is a cumulative check of all thread elements except the major diameter.
通规螺纹环规：可调的通端螺纹环规必须要调到可应用的W公差调整塞规来确保它们是在要求的限度里面. 产品的螺纹必须能自由地进入通端螺纹环规的整个螺纹部分长度. 这个通规螺纹环
规是对除了大径之外的所有螺纹部分的累积检查.
NOT GO (LO) Thread Ring Gages: NOT GO (LO) thread ring gages must be set to the applicable W tolerance setting plugs to assure that they are within specified limits.
止规螺纹环规：止规螺纹环规必须要调到可应用的W公差调整塞规来确保它们在指定的极限内.
NOT GO (LO) thread ring gages when applied to the product external thread may engage only the end threads (which may not be representative of the complete product thread) Starting threads on NOT GO (LO) rings are subject to greater wea r than the remaining threads. Such wear in combination with the incomplete threads at the end of the product thread permit further entry in the gage. NOT GO (LO) functional diameter is acceptable when the NOT GO (LO) thread ring gage applied to the product external thread does not pass over the thread more than three complete turns.
The gage should not be forced. Special requirements such as exceptionally thin or ductile material, small number of threads, etc., may necessitate modification of this practice.
止规螺纹环规当应用到产品的外螺纹时可能只能与末端的螺纹配合(末端的螺纹可能并不能代表整个产品螺纹).在止规环上转动螺纹取决于大的磨损，而不是剩余的螺纹. 这些磨损加上产品螺纹末端的不完整螺纹可以允许螺纹进一步进入环规. 当止规螺纹环规应用到产品外螺纹时没有通过三个以上完整的螺纹, 有效直径是接受的. 不能用力压规量. 在特殊情况下，比如特别薄或柔软的材料,
螺纹扣数少，可能有必要对这个测量方法做修正.
GO and NOT GO Plain Ring and Snap Gages for Checking Major Diameter of Product External Thread: The GO gage must completely receive or pass over the major diameter of the product external thread to ensure that the major diameter does not exceed the maximum- material-limit. The NOT GO gage must not pass over the major diameter of the product external thread to ensure that the major diameter is not less than the minimum-materiallimit. 用于检查产品外螺纹大径的通规与止规普通环规及卡规: 这个通规必须完全配合或经过产品外螺纹大径来确保大径不会超过最大实体极限. 这个止规必须不能通过产品外螺纹大径来确保大径不会小于最小实体极限.
Limitations concerning the use of gages are given in the standard as follows:
该标准中关于量规使用的局限性如下:
Product threads accepted by a gage of one type may be verified by other types. It is possible, however, that parts which are near either rejection limit may be accepted by one type
and rejected by another. Also, it is possible for two individual limit gages of the same type
to be at the opposite extremes of the gage tolerances permitted, and borderline product threads accepted by one gage could be rejected by another. For these reasons, a product

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