2 m: _: F0 n; {# [1. Title block brief introduction # C, Q t3 T# D* w" p : C% x( [8 v) B4 _% E( f; H! y$ D- E/ O2. Text height+ g, @( y# [+ e5 a
9 q; ]% A; {3 j0 D2 H/ W6 q: ~3. Viewport / x* x4 B% a) E/ L; F
r5 N# V# w1 N+ ~4. Dimensions style brief introduction0 b1 f: z- B8 f O* w9 r. c% o
• Tolerance in Mechanical / Autocad- a0 T6 v) j- S% i' |3 c! J3 I
, J) b2 Q4 D+ V4 kspecial symbols 7 {, ? h; P5 E%%D degree sign* `. e @- s) I0 E. N" \
%%P plus and minus sign5 u# ^& |& d* E" w. \% Z
%%C diameter symbol
[V] AutoCAD 实战讲座第七讲+ c& l& j; W5 I- n/ f& I2 R. n
AutoCAD 实战讲座第七讲: R1 l; q0 a6 x2 s& h# Q: ^
New Maple AutoCAD (7)4 Q; k: Q w# m( E www.newmaple.com/video/autocad0007& ~% D6 X( C! L a
) [6 e! `% F: p* i
A real sample to review lecture 6* {# L% [5 g( n' O4 K
* ]) ^- `# l( z0 u- M2 \2 J$ D& M3 OIntroduction Roughness ! X$ o W4 i/ r& G9 W, R. b" rQuick check hole size and position! b# P% P' @+ L+ E
Introduction O-ring groove 7 N0 S% o4 ~# x# k; n1 @! n$ f! q9 {! |6 ^% c+ _+ p2 r
Surface roughness7 O: v) T* b7 X/ ^6 s7 e0 ?
• Imperial Unit: micro-inch 10-6 inch! K1 z( l# _' @9 j; U$ J( _# M# v, o
• Metric Unit: micrometer 10-6 m 8 G! N: [) Y; m6 G. M• Sample 250 micro-inch = 6.3 micrometer |. D9 y# T/ ?. j( I! x% q; w(250X25.4X10-3)/ ?- o1 l K/ l
• 250 micro-inch – forging surface% e: b4 q0 t5 t
• 125 rough machine, 32 fine machine 6 [9 m/ D) w/ M " _6 ]5 @ T8 U: @Inch size O-ring 7 e5 r' T. x0 R• O-ring number 232 , P2 y/ {- `0 y) Q; E• nominal size 2.75”x3”x1/8” 3 O9 B+ m' F: t+ q+ B• Actual size 2.734”x3.012”x0.139”/ |3 w b/ M3 n" x! {/ \
• Static surface seal groove depth 0.101~0.107 about 25% squeeze; h# b) A/ y( |1 t7 C
• One of OD or ID is close standard size& G5 e* y7 P, I! P1 g
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