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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
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8 e. l6 A$ |* Z; p- |+ b& S0 u其实人家图纸根本没有错,你想歪了。' m! ]' D7 |: d% L) r
1、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。" r3 F" Y5 P6 k: R
附上一些尺寸的基本原则:; q4 d6 o9 a! J0 z0 K7 o! j5 G
a) Each dimension shall have a tolerance, except for those dimensions specifically identified as" M6 C3 j9 K- v( c( q
reference, maximum, minimum, or stock (commercial stock size). The tolerance may be applied directly
& k( j) i. \( L' n1 Mto the dimension (or indirectly in the case of basic dimensions), indicated by a general note, or located in9 B0 q+ O( S! b% `3 N7 F; W' j
a supplementary block of the drawing format. See ANSI Y14.1.
6 m6 i! ]( H0 H: Z, b1 {8 B; |(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# `, Y7 D; K- c
drawing) nor assumption of a distance or size is permitted, except as follows: Undimensioned drawings,
' f$ w' z! Y3 H! Qsuch as loft, printed wiring, templates, and master layouts prepared on stable material, are excluded
, }- X9 r `! p! L+ |; A0 B. |4 Tprovided the necessary control dimensions are specified.' D4 M9 c3 s% f8 u% p! U7 n4 ^
(c) Each necessary dimension of an end product shall be shown. No more dimensions than those2 F/ u, N3 w/ E
necessary for complete definition shall be given. The use of reference dimensions on a drawing should
6 t: V& Y6 ^" }& Wbe minimized.
3 c' s+ X `( {0 [) r(d) Dimensions shall be selected and arranged to suit the function and mating relationship of a part
1 `& _; o7 p: W0 b7 { c% gand shall not be subject to more than one interpretation.
) z& u# X! i) R" j7 o! J(e) The drawing should define a part without specifying manufacturing methods. Thus, only the
; @% @" C( X: E; j& Fdiameter of a hole is given without indicating whether it is to be drilled, reamed, punched, or made by any
9 a, l3 _2 h; @other operation. However, in those instances where manufacturing, processing, quality assurance, or
3 K' I+ F, t( u. y$ ^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.
% O) b( C- I" K9 ~9 G3 o0 H(f) It is permissible to identify as nonmandatory certain processing dimensions that provide for
1 S! [1 V4 [7 u5 _ g& L8 Cfinish allowance, shrink allowance, and other requirements, provided the final dimensions are given on$ F N& u( I" t
the drawing. Nonmandatory processing dimensions shall be identified by an appropriate note, such as
$ B6 w9 |! v ^; x P5 w' TNONMANDATORY (MFG DATA).
7 V6 ]' J. y) g/ 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.
: f* S, ]8 M, S5 B(h) Wires, cables, sheets, rods, and other materials manufactured to gage or code numbers shall be
0 O. w! `0 H& K& c: l& {$ ?5 [) jspecified by linear dimensions indicating the diameter or thickness. Gage or code numbers may be. p7 t' w+ s& |+ {7 w& [
shown in parentheses following the dimension.
& _, s7 u6 A) P4 ^9 D! A" ](i) A 90° angle applies where center lines and lines depicting features are shown on a drawing at; O; E" {- q; p
right angles and no angle is specified.' O5 b$ _( Q* K, w9 X8 J
(j) A 90° basic angle applies where center lines of features in a pattern or surfaces shown at right
4 C8 P4 b) e# C! t/ f. v0 Gangles on the drawing are located or defined by basic dimensions and no angle is specified.9 @# ` Y& B! e1 Z
(k) Unless otherwise specified, all dimensions are applicable at 20°C (68°F). Compensation may be8 z: ?5 \1 ?' J- a7 T
made for measurements made at other temperatures. X8 N5 U" D$ @6 T- t9 S% Z! q
(l) All dimensions and tolerances apply in a free state condition. This principle does not apply to
1 W7 `2 t8 W7 p) x; `nonrigid parts as defined in section 5.5.
/ l) o9 e2 B; s6 g6 G6 o. v(m) Unless otherwise specified, all geometric tolerances apply for full depth, length, and width of the% G0 L6 H, P C
feature.; S, U6 e9 E9 [: m! t
(n) Dimensions and tolerances apply only at the drawing level where they are specified. A dimension
- `* p3 Z' Q& |$ }8 lspecified for a given feature on one level of drawing, (for example, a detail drawing) is not mandatory for: v% t7 P) m% D: _ U
that feature at any other level (for example, an assembly drawing)
1 H4 o( \/ g, J8 l6 V9 n9 S1 R+ `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。
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