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发表于 2015-2-10 19:40:28
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本帖最后由 seekfor 于 2015-2-10 19:41 编辑 6 ?( D5 B& a' I
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其实人家图纸根本没有错,你想歪了。
2 p' S, s" g* v7 W1、从这个视图看过去那根线就是表示的那个表面,注意(默认的basic dimension 90°)。并没有你所表述的、歪成那样的位置下(basic dimension 不为90°)再评价垂直度。我觉得你把这个垂直度理解为平面度了。
2 a- R( B! g( f0 G附上一些尺寸的基本原则:
5 ^; m( G4 f( ja) Each dimension shall have a tolerance, except for those dimensions specifically identified as/ J- o! A+ e2 Q4 i/ F2 v- c7 ~
reference, maximum, minimum, or stock (commercial stock size). The tolerance may be applied directly
2 `# l; A' O& ^6 V2 r* Wto the dimension (or indirectly in the case of basic dimensions), indicated by a general note, or located in
j( x5 r" L! n, S9 _0 i1 {. `1 Sa supplementary block of the drawing format. See ANSI Y14.1.4 Z2 V0 I' z3 H+ y7 G
(b) Dimensioning and tolerancing shall be complete so there is full understanding of the characteristics of each feature. Neither scaling (measuring the size of a feature directly from an engineering
) f0 m' X6 [# M; Pdrawing) nor assumption of a distance or size is permitted, except as follows: Undimensioned drawings, Q7 [( T; @, {, p2 Q$ d
such as loft, printed wiring, templates, and master layouts prepared on stable material, are excluded) G1 W- S' @8 b) h9 U9 z; }' S
provided the necessary control dimensions are specified., f8 d1 F/ K3 [/ U. ]/ h
(c) Each necessary dimension of an end product shall be shown. No more dimensions than those$ i8 V6 s6 W' \1 m5 k N$ @5 b
necessary for complete definition shall be given. The use of reference dimensions on a drawing should) E8 c3 V1 w0 |" S4 f# E
be minimized.$ {( r" O2 J, C# j7 x# w
(d) Dimensions shall be selected and arranged to suit the function and mating relationship of a part l/ B8 b8 ~5 p5 S
and shall not be subject to more than one interpretation.& a3 _) H8 J: U7 p4 o
(e) The drawing should define a part without specifying manufacturing methods. Thus, only the1 R1 |$ \& J( T9 H, J
diameter of a hole is given without indicating whether it is to be drilled, reamed, punched, or made by any
9 M, s# z7 B6 u" u8 [4 ]' }2 Hother operation. However, in those instances where manufacturing, processing, quality assurance, or
1 g5 r9 M! W# w% u r! Y& eenvironmental information is essential to the definition of engineering requirements, it shall be specified on the drawing or in a document referenced on the drawing.1 \/ ^6 ?! E' p: }$ t8 T j( _
(f) It is permissible to identify as nonmandatory certain processing dimensions that provide for
( q6 [+ }( Y: R! i: [! Yfinish allowance, shrink allowance, and other requirements, provided the final dimensions are given on
0 X- r3 g- d$ qthe drawing. Nonmandatory processing dimensions shall be identified by an appropriate note, such as
& _1 W8 }" _* I* v9 t% vNONMANDATORY (MFG DATA).
" T p, b3 y& a q" Q: t(g) Dimensions should be arranged to provide required information for optimum readability. Dimensions should be shown in true profile views and refer to visible outlines.
" x% W6 |' D# d. C9 n# e4 R(h) Wires, cables, sheets, rods, and other materials manufactured to gage or code numbers shall be. c6 f- B& E+ B$ M0 B1 ?
specified by linear dimensions indicating the diameter or thickness. Gage or code numbers may be, P6 U5 L. y$ x$ O/ ]
shown in parentheses following the dimension.5 m+ `( t8 t! X; N5 Y/ m+ F
(i) A 90° angle applies where center lines and lines depicting features are shown on a drawing at
% j7 P$ \9 j+ n1 `7 Lright angles and no angle is specified.( Y0 \' o3 J" B V
(j) A 90° basic angle applies where center lines of features in a pattern or surfaces shown at right
6 t, q7 ]) G: Jangles on the drawing are located or defined by basic dimensions and no angle is specified.1 _( h& V" ?6 D* f5 G3 e
(k) Unless otherwise specified, all dimensions are applicable at 20°C (68°F). Compensation may be
5 I+ ]/ n' c7 L' Umade for measurements made at other temperatures.5 n* U+ g# ~$ ?
(l) All dimensions and tolerances apply in a free state condition. This principle does not apply to8 `# Q( s Y7 I$ I8 o2 Z
nonrigid parts as defined in section 5.5.
9 Z; H( b0 U; o- W8 W7 r/ [(m) Unless otherwise specified, all geometric tolerances apply for full depth, length, and width of the3 ?5 p1 P3 u- u& T
feature.. J8 l7 P/ ` m& M
(n) Dimensions and tolerances apply only at the drawing level where they are specified. A dimension l% N: b! B/ v, @
specified for a given feature on one level of drawing, (for example, a detail drawing) is not mandatory for
* ^ T% y/ j9 Z0 G8 P5 Qthat feature at any other level (for example, an assembly drawing)0 b+ B$ g7 p* Z Z1 F+ t: i8 G6 i
一下是其中一个中文PPT中的,中文的仅供参考,翻译不全感觉,也感觉不是很贴切愿意。( w& n. z+ N" |6 Y/ i5 p
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