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本帖最后由 seekfor 于 2015-2-10 19:41 編輯
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* ]( w& ^: y; k: T其實人家圖紙根本沒有錯,你想歪了。
2 l2 \) i% j+ f8 O3 x* Z1、從這個視圖看過去那根線就是表示的那個表面,注意(默認的basic dimension 90°)。并沒有你所表述的、歪成那樣的位置下(basic dimension 不為90°)再評價垂直度。我覺得你把這個垂直度理解為平面度了。$ Q$ z: ?0 x+ p; o" l
附上一些尺寸的基本原則:
9 p9 G; j, Q* X7 k! h! ja) Each dimension shall have a tolerance, except for those dimensions specifically identified as
& ~& V! Q/ `" v: Zreference, maximum, minimum, or stock (commercial stock size). The tolerance may be applied directly
$ u6 c- q1 [7 g( s, |$ mto the dimension (or indirectly in the case of basic dimensions), indicated by a general note, or located in; [3 z1 m) y6 \: c- O6 x, a3 k
a supplementary block of the drawing format. See ANSI Y14.1.4 w% \' b& C0 d) L3 u+ W
(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
1 z; H5 X3 r0 t3 A4 o" Idrawing) nor assumption of a distance or size is permitted, except as follows: Undimensioned drawings,
4 q/ Y' C, E @1 }such as loft, printed wiring, templates, and master layouts prepared on stable material, are excluded
& R& z. v( l+ d7 B# Mprovided the necessary control dimensions are specified.
7 Y# j1 j8 f1 U, ^, ~" E(c) Each necessary dimension of an end product shall be shown. No more dimensions than those
7 e: [- u6 j- C0 M# |" b% `necessary for complete definition shall be given. The use of reference dimensions on a drawing should
. f2 }) F) K/ @9 U g# wbe minimized.& e. n) K, G1 |9 p% O* U9 {+ D
(d) Dimensions shall be selected and arranged to suit the function and mating relationship of a part
) C$ v7 F2 A- ?! Nand shall not be subject to more than one interpretation.
' i$ ], c7 P# i(e) The drawing should define a part without specifying manufacturing methods. Thus, only the# B/ P+ f* C3 j! v% g- ?
diameter of a hole is given without indicating whether it is to be drilled, reamed, punched, or made by any" I1 F6 q3 P" Q1 X W" v! x! f
other operation. However, in those instances where manufacturing, processing, quality assurance, or
4 _2 a3 `5 t( j8 Q( H4 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.
* @, s! d/ X+ @(f) It is permissible to identify as nonmandatory certain processing dimensions that provide for
- X, z( T& l! R0 |finish allowance, shrink allowance, and other requirements, provided the final dimensions are given on
/ h+ `! u4 L; {) ^' Q: B7 wthe drawing. Nonmandatory processing dimensions shall be identified by an appropriate note, such as
7 H" p5 y' I6 v! D# wNONMANDATORY (MFG DATA).- W8 k1 u6 X# O4 x$ t4 ^' Z
(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.
. f+ v/ @ d1 n( {9 P(h) Wires, cables, sheets, rods, and other materials manufactured to gage or code numbers shall be. G7 x% B" @5 |0 [, R5 @
specified by linear dimensions indicating the diameter or thickness. Gage or code numbers may be
9 y1 Q0 x: Z$ W/ k8 D! sshown in parentheses following the dimension.
4 ]* C, a7 e) B5 _- U2 T2 `(i) A 90° angle applies where center lines and lines depicting features are shown on a drawing at
! w! N/ M7 O3 D6 c1 Uright angles and no angle is specified.
3 Y1 g6 c; m# x+ h9 M2 J6 L(j) A 90° basic angle applies where center lines of features in a pattern or surfaces shown at right! f( e3 G6 ~5 M; R
angles on the drawing are located or defined by basic dimensions and no angle is specified.& r3 M9 d$ g4 u( z( ]/ |
(k) Unless otherwise specified, all dimensions are applicable at 20°C (68°F). Compensation may be
: m, E- R+ O4 Q( [6 jmade for measurements made at other temperatures.
6 C. C5 v) `. x9 V+ Y6 y8 I(l) All dimensions and tolerances apply in a free state condition. This principle does not apply to9 q0 o B2 W7 W% E" a1 S/ r
nonrigid parts as defined in section 5.5.
2 T7 I7 \ B2 F$ ~! L(m) Unless otherwise specified, all geometric tolerances apply for full depth, length, and width of the
7 h# @/ N1 e' T2 f% S" bfeature.
( C7 Z5 d1 E/ d( c) e$ _(n) Dimensions and tolerances apply only at the drawing level where they are specified. A dimension$ x5 s) ?- `, G" \8 T, a+ l2 B6 o5 X
specified for a given feature on one level of drawing, (for example, a detail drawing) is not mandatory for" m. Z6 Q% ^! K5 F, ]* _6 X! Q; ?, U6 ~
that feature at any other level (for example, an assembly drawing)
& G% H( R" N5 w9 w. q* c一下是其中一個中文PPT中的,中文的僅供參考,翻譯不全感覺,也感覺不是很貼切愿意。( [2 u, b$ x: [
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