图纸中的符号

图纸中的符号Straightness - a condition where an element of a surface or an axis is a straight line. —直度：一个条件，一个面元素或轴是一条直线Flatness- is the condition of a surface having all elements in one plane. —平整度:是条件，表面有所有的元素在一个平面Roundness - describes the condition on a surface of revolution (cylinder, cone, sphere) where all points of the surface intersected by any plane. —圆度:描述条件对革命的表面(圆柱,圆锥,球)在所有点的表面相交的任何飞机Cylindricity - describes a condition of a surface of revolution in which all points of a surface are equidistant from a common axis.—圆柱度:描述了一个条件的旋转面,使所有的点面距离相等,一个共同的旋转轴Profile of a Line- is the condition permitting a uniform amount of profile variation, ether unilaterally or bilaterally, along a line element of a feature.—线轮廓度:是条件允许量相同的剖面变化,醚单边或双边,沿着一条线元素的Profile of a Surface - is the condition permitting a uniform amount of profile variation, ether unilaterally or bilaterally, on a surface.—面轮廓度：是条件允许量相同的剖面变化，醚单边或双边，上表面All Around Symbol - indicating that a tolerance applies to surfaces all around the part.—周围标志:表明公差适用于所有周围的部分表面Angularity - is the condition of a surface, axis, or centerplane, which is at a specified angle from a datum plane or axis.—倾斜度:是表面，轴，或中线，这是从某一特定角度基准平面或轴Perpendicularity - is the condition of a surface, axis, or line, which is 90 deg. From a datum plane or a datum axis.—垂直度:条件是表面，轴，或线，这是90度的基准平面或基准轴Parallelism- is the condition of a surface, line, or axis, which is equidistant at all points from a datum plane or axis.—平行度:一个表面，线，或轴，这是等距离的所有点，基准平面或轴Position Tolerance - defines a zone within which the axis or center plane of a feature is permitted to vary from true (theoretically exact) position.—位置公差:定义一个区域内的轴或中心平面的一个特点是允许不同的真正的(理论上精确)位置Concentricity - describes a condition in which two or more features , in any combination, have a common axis.—同心度:描述在其中一个条件的2个或更多的功能，在任何组合，有一个共同的旋转轴Symmetry- is a condition in which a feature (or features) is symmetrically disposed about the center plane of a datum feature.—对称度:是一种状况，其中一个功能（或功能）是处理有关对称中心平面基准特征Runout- is the composite deviation from the desired form of a part surface of revolution through on full rotation (360 deg) of the part on a datum axis.—跳动:是复合偏离理想形式的一部分表面上通过革命旋转（360度）的一部分，在基准轴Total Runout - is the simultaneous composite control of all elements of a surface at all circular and profile measuring positions as the part is rotated through 360.—全跳动:是同时复合控制所有表面元素在所有圆轮廓测量位置的部分是通过旋转360Maximum Material Condition (MMC) - is that condition of a part feature wherein it contains the maximum amount ofmaterial within the stated limits of size. That is: minimum hole size and maximum shaft size.—最大材料状态:是条件的一部分功能其中包含的最高金额材料在规定的极限尺寸。

那就是：最小孔尺寸和最大轴尺寸Least Material Condition (LMC) - implies that condition of a part feature of size wherein it contains the least (minimum) amount of material, examples, largest hole size and smallest shaft size. It is opposite to maximum material condition.—最小材料状态:意味着条件的一部分功能的大小，其中也包含了最小（最低）的材料，例子，最大孔尺寸和最小轴径。

它的对面是最大材料状态。

Regardless Of Feature Size (RFS)- the condition where the tolerance of form, runout or location must be met irrespective of where the feature lies within its size tolerance.—不论大小的特征:不论大小的特征的情况下，形状公差，跳动或位置必须满足，不论在哪里，它的特点是在其尺寸公差Projected Tolerance Zone - applies to a hole in which a pin, stud, screw,etc., is to be inserted. It controls the perpendicularity of the hole tothe extent of the projection from the hole and as it relates to the matingpart clearance. The projected tolerance zone extends above the surface ofthe part to the functional length of the pin, stud, and screw relative toits assembly with the mating part.—投影公差区Tangent Plane - indicating a tangent plane is shown. The symbol is placedin the feature control frame following the stated tolerance.—切平面Free State Variations- is a term used to describe distortion of a part afterremoval of forces applied during manufacture.—自由状态的变化Diameter- indicates a circular feature when used on the field of a drawingor indicates that the tolerance is diametrical when used in a feature controlframe.—直径Basic Dimension- used to describe the exact size, profile, orientation orlocation of a feature. A basic dimension is always associated with a featurecontrol frame or datum target. (Theoretically exact dimension in ISO)—基本尺寸Reference Dimension - a dimension usually without tolerance, used forinformation purposes only. It does not govern production or inspectionoperations. (Auxiliary dimension in ISO)—参考尺寸Datum Feature - is the actual component feature used to establish a datum.—基准特征Dimension Origin - Signifies that the dimension originates from the planeestablished by the shorter surface and dimensional limits apply to the othersurface.—尺寸原—特征控制框Feature Control Frame- is a rectangular box containingthe geometric characteristics symbol, andthe form, runout or location tolerance. If necessary,datum references and modifiers applicable to the featureor the datums are also contained in the box.Conical Taper - is used to indicate taper for conical tapers. This symbolis always shown with the vertical leg to the left.—圆锥锥度Slope - is used to indicate slope for flat tapers. This symbol is alwaysshown with the vertical leg to the left.—斜坡度Counterbore/Spotface - is used to indicate a counterbore or a spotface. Thesymbol precedes the dimension of the counterbore or spotface, with no space—沉孔或锪平Countersink - is used to indicate a countersink. The symbol precedes thedimensions of the countersink with no space.—埋头孔Depth/Deep - is used to indicate that a dimension applies to the depth ofa feature. This symbol precedes the depth value with no space in between.—深度Square - is used to indicate that a single dimension applies to a squareshape. The symbol precedes the dimension with no space between.—正方形Number of Places - the X is used along with a value to indicate the numberof times a dimension or feature is repeated on the drawing.—相同的地方Arc Length - indicating that a dimension is an arc length measured on acurved outline. The symbol is placed above the dimension.—电弧长度Radius - creates a zone defined by two arcs (the minimum and maximum radii).The part surface must lie within this zone.—半径之间Between - to indicate that a profile tolerance applies to several contiguousfeatures, letters may designate where the profile tolerance begins and ends.These letters are referenced using the between symbol (since 1994) or theword between on drawings made to earlier versions of the Standard.统计公差Statistical Tolerance - i s the assigning of tolerances to relatedcomponents of an assembly on the basis of sound statistics (such as theassembly tolerance is equal to the square root of the sum of the squaresof the individual tolerances). By applying statistical tolerancing,tolerances of individual components may be increased or clearances betweenmating parts may be reduced. The increased tolerance or improved fit mayreduce manufacturing cost or improve the product's performance, but shallonly be employed where the appropriate statistical process control will beused. Therefore, consideration should be given to specifying the requiredCp and /or Cpk or other process performance indices.—基准公差Datum Target - is a specified point, line, or area on a part that isused to establish the Datum Reference Plane for manufacturing andinspection operations.。