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本帖最后由 seekfor 于 2015-2-10 19:41 編輯
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3 q7 ^0 C6 ^9 u其實人家圖紙根本沒有錯,你想歪了。
2 R! ?" C( c9 n' t8 r% i6 u1 f1、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。
9 T+ p% x; O B& `) e0 r+ G' j/ x附上一些尺寸的基本原則:
: c% S+ H8 q) y# M8 va) Each dimension shall have a tolerance, except for those dimensions specifically identified as, W6 {4 s* G& F. o4 A8 y
reference, maximum, minimum, or stock (commercial stock size). The tolerance may be applied directly4 F+ z1 o( F& F( ~
to the dimension (or indirectly in the case of basic dimensions), indicated by a general note, or located in* Q' v+ T1 ^2 [
a supplementary block of the drawing format. See ANSI Y14.1.
o: h& q* k t( ?(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
! o$ _ }; J0 {" M+ k$ B, O( Ydrawing) nor assumption of a distance or size is permitted, except as follows: Undimensioned drawings,8 y% c. T& S+ Z7 n4 O6 U7 n
such as loft, printed wiring, templates, and master layouts prepared on stable material, are excluded' F3 |; E5 ^- s6 p6 V9 J; I
provided the necessary control dimensions are specified.* O# _3 e6 n# Y2 w9 t; D% _) i
(c) Each necessary dimension of an end product shall be shown. No more dimensions than those/ z7 m- N/ a5 _- S
necessary for complete definition shall be given. The use of reference dimensions on a drawing should V9 s" E G) H( p
be minimized.
% J. t/ z' E6 X+ Z(d) Dimensions shall be selected and arranged to suit the function and mating relationship of a part
! t' s5 B1 ^9 [and shall not be subject to more than one interpretation.9 k" E6 Y- W) x( `7 C5 F; t0 R5 ?7 z
(e) The drawing should define a part without specifying manufacturing methods. Thus, only the
: v2 K8 M+ \" N! Vdiameter of a hole is given without indicating whether it is to be drilled, reamed, punched, or made by any2 m' w' m& t- J& F& x
other operation. However, in those instances where manufacturing, processing, quality assurance, or
# B( M4 ]0 @7 g2 l1 V/ c' {environmental information is essential to the definition of engineering requirements, it shall be specified on the drawing or in a document referenced on the drawing.
" e4 U0 p$ S9 @; v/ v4 o(f) It is permissible to identify as nonmandatory certain processing dimensions that provide for! @9 b2 [, { ^; J% \
finish allowance, shrink allowance, and other requirements, provided the final dimensions are given on
( @! W; D5 W$ n! _7 mthe drawing. Nonmandatory processing dimensions shall be identified by an appropriate note, such as. `- Q4 J5 O; G: X% x6 A s' A! J
NONMANDATORY (MFG DATA).5 S0 l: t( }* K \1 q+ D4 Y2 t+ v
(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.
7 g6 u) V0 r. b! A# i2 c(h) Wires, cables, sheets, rods, and other materials manufactured to gage or code numbers shall be0 H$ Y; z5 g6 }8 t8 A& T- U
specified by linear dimensions indicating the diameter or thickness. Gage or code numbers may be
' H- X. t8 F+ E% yshown in parentheses following the dimension.
7 y1 t$ Y. o1 Y(i) A 90° angle applies where center lines and lines depicting features are shown on a drawing at
" i% v7 y8 q* A6 j# ?7 F7 vright angles and no angle is specified.
4 b+ w" W' q3 L(j) A 90° basic angle applies where center lines of features in a pattern or surfaces shown at right
) B( @4 l |1 _. s, q, K$ |5 |angles on the drawing are located or defined by basic dimensions and no angle is specified.
: n" X$ \8 U( [(k) Unless otherwise specified, all dimensions are applicable at 20°C (68°F). Compensation may be7 m, i) O X- L# b
made for measurements made at other temperatures.
! a: z$ ]' o! @# O(l) All dimensions and tolerances apply in a free state condition. This principle does not apply to! ^# w4 |6 [# ]3 ?3 y$ d# F
nonrigid parts as defined in section 5.5.
7 P0 ~7 X3 v: O(m) Unless otherwise specified, all geometric tolerances apply for full depth, length, and width of the9 _, G2 ~% ?1 X, W: `: C- F( ~# J$ r
feature.& E1 W5 h$ v& w' f/ ]) Y
(n) Dimensions and tolerances apply only at the drawing level where they are specified. A dimension [: @( b) {! H/ K
specified for a given feature on one level of drawing, (for example, a detail drawing) is not mandatory for
6 F/ m7 J' a" e# b* Xthat feature at any other level (for example, an assembly drawing)5 W7 @ b3 P8 t2 _2 T
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。( k7 Z$ C/ O$ b/ q. X; |
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