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本帖最后由 seekfor 于 2015-2-10 19:41 編輯
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其實人家圖紙根本沒有錯,你想歪了,。
$ G) [; R( T n8 e1 J$ n1,、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,。
! m' V* B. }) w9 Z" _附上一些尺寸的基本原則:- }8 k% x6 D. v7 A0 Y9 D3 K$ R2 H
a) Each dimension shall have a tolerance, except for those dimensions specifically identified as
# J8 D4 d/ c5 k/ J2 X) r! q- |reference, maximum, minimum, or stock (commercial stock size). The tolerance may be applied directly
- z" W4 {* ~3 X3 H4 D# sto the dimension (or indirectly in the case of basic dimensions), indicated by a general note, or located in
% j5 h/ P1 Q( l& i' ia supplementary block of the drawing format. See ANSI Y14.1.
; D' ]7 [' l; D' y8 h( m# q2 u(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 engineering7 @0 ?/ ~% U e/ {* k1 ^, }
drawing) nor assumption of a distance or size is permitted, except as follows: Undimensioned drawings,
% m! w- k! B# ~) Lsuch as loft, printed wiring, templates, and master layouts prepared on stable material, are excluded
8 r! @) G' E, y9 ~. \- m# Q$ Uprovided the necessary control dimensions are specified.
" h5 i- [! B* r8 a! V(c) Each necessary dimension of an end product shall be shown. No more dimensions than those
! W3 n6 _% a) j* E3 T& Knecessary for complete definition shall be given. The use of reference dimensions on a drawing should- ?- w" B7 M/ b
be minimized.- }% m/ @: {( [" H
(d) Dimensions shall be selected and arranged to suit the function and mating relationship of a part$ ?- N- ]- H, R% \1 ~6 Y$ b+ t
and shall not be subject to more than one interpretation.% I8 w% z+ F5 @- e
(e) The drawing should define a part without specifying manufacturing methods. Thus, only the
/ i8 M5 J$ B8 N* I* |diameter of a hole is given without indicating whether it is to be drilled, reamed, punched, or made by any
9 C* ?( F1 A4 L6 o" @ }3 uother operation. However, in those instances where manufacturing, processing, quality assurance, or
' B! a. d. }2 I" A+ ?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.
+ S1 K$ C( a) I7 j+ c: ?' C0 } a(f) It is permissible to identify as nonmandatory certain processing dimensions that provide for6 e, O; c: G9 K: B
finish allowance, shrink allowance, and other requirements, provided the final dimensions are given on
6 J* |# W6 k& Q" v0 [8 vthe drawing. Nonmandatory processing dimensions shall be identified by an appropriate note, such as
& i. W2 W; p4 VNONMANDATORY (MFG DATA).
" n! P r' ~* b4 V$ v* 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.
, S' Y& W4 }/ E(h) Wires, cables, sheets, rods, and other materials manufactured to gage or code numbers shall be
, G+ v6 a: n# |3 X4 G: Rspecified by linear dimensions indicating the diameter or thickness. Gage or code numbers may be- F% J& J4 g0 {! R& Q5 ^7 |) l
shown in parentheses following the dimension.
6 U' i5 n h; q4 w) v/ F$ m(i) A 90° angle applies where center lines and lines depicting features are shown on a drawing at
- O9 ?4 a9 B7 b4 uright angles and no angle is specified.; z. f: U) M; {0 ?
(j) A 90° basic angle applies where center lines of features in a pattern or surfaces shown at right6 a( l0 [) i6 @) E8 t1 n
angles on the drawing are located or defined by basic dimensions and no angle is specified.& n3 z: I" x5 n' I3 l
(k) Unless otherwise specified, all dimensions are applicable at 20°C (68°F). Compensation may be2 L6 Q u6 p2 R+ j' y
made for measurements made at other temperatures.) o3 [; m0 c3 H5 }5 T/ w4 w
(l) All dimensions and tolerances apply in a free state condition. This principle does not apply to, a4 _% ?( V' w7 b& Y
nonrigid parts as defined in section 5.5.
. a0 a# M, l! d8 c: `+ e(m) Unless otherwise specified, all geometric tolerances apply for full depth, length, and width of the
3 D9 q% h2 I9 n3 n% Q2 pfeature.- a$ I3 z8 I; m
(n) Dimensions and tolerances apply only at the drawing level where they are specified. A dimension3 H, m% \5 w l* r9 N. @
specified for a given feature on one level of drawing, (for example, a detail drawing) is not mandatory for( B8 l% `6 R' E6 c' N2 e. r8 l
that feature at any other level (for example, an assembly drawing)
/ N. O* A" J4 D1 b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,。1 e: `$ k5 P# W( S; H* c1 e
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