螺纹中径

Considering the pitch deviation, pitch accumulative deviation, flank angle deviation and their combined influence on the pitch diameter, the authors present a complete differential optimal approximate model in this paper and use the ideal thread to approximate the actual thread radially and axially.

本文建立的螺纹中径当量全微分优化逼近模型，考虑了螺距偏差、螺距累积偏差和半角偏差本身及其相互间对中径的综合影响，并用理想螺纹在径向和轴向二维逼近实际螺纹。

Only three leverage the amount of needles and micrometer and the necessary clamping screw of the bracket can then be processed in the original survey data will be able to find the pitch diameter of the.

只需要三根量针和杠杆千分尺以及必要的夹持螺纹的支架即可，然后把原始测量数据进行处理就能求出螺纹中径了。

The results indicate that this system can effectively and automatically measure thread medium diameter,cone,thread pitch and pipe-thread shape so as to the problem of integrated measurement of petroleum pipe threads agilely.

结果表明，该系统可以高效自动地测量螺纹中径、锥度、螺距和管螺纹形状，可便捷地解决石油管螺纹的综合测量问题。

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。

It is feasible to substitute the pitch diameter gauge and the ovality gauge for the thread work gauge.

用中径和椭圆度量规替代螺纹工作量规是可行的。

Key words: Length measuring machine; Thread ring gauge; Pitch diameter; Measure; Uncertainty assessing

关健词：测长机；螺纹环规；中径；测量；不确定度

This paper introduces the structural characteristic and the way of selecting and confirming diameter of the three-needle on measuring pitch diameter of thread, while the thread gauge is manufactured.

非标M77×2(3°／45°)特锯齿形螺纹在我国还较少见，这里对该螺纹的结构特点作了介绍，同时介绍了该螺纹量规制造过程中使用三针测量螺纹中径时，如何选择和确定三针直径。

In order to real-timely and accurately measure thread parameters such as thread angle(tooth-type half-angle),screw-pitch,lead,thread height,major diameter,minor diameter,pitch diameter,helix angle etc,and enhance the measuring accuracy,a non-contact thread parameter measuring system based on an array CCD was designed and achieved.

为实时准确地对螺纹的牙型角、螺距、导程、螺纹高度、大径、小径、中径、螺纹升角等参数进行测量，并提高测量精度，设计并实现了基于面阵CCD的螺纹参数非接触测量系统。

Rational new method for checking ring gauge is put forward in this paper. For pitch less than 0.5 mm check plug is used to inspect size on virtual effective diameter and simple effective diameter, but for pitch over 0.5 mm, check plug is only used to inspect size on virtual effective diameter, simple effective diameter is measured by double ball.

提出了对于螺距不大于0.5 mm的螺纹环规，采用校对规检验作用中径及单一中径；而对于螺距大于0.5 mm的螺纹环规，则采用校对规检验作用中径，双球法测量单一中径。

Rational new method for checking ring gauge is put forward in this paper. For pitch less than 0.5 mm check plug is used to inspect size on virtual effective diameter and simple effective diameter, but for pitch over 0.5 mm, check plug is only used to inspect size on virtual effective diameter, simple effective diameter is measured by double ball.

提出了对于螺距不大于0.5 mm的螺纹环规，采用校对规检验效用中径及单一中径；而对于螺距大于0.5 mm的螺纹环规，则采用校对规检验效用中径，双球法测量单一中径。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失