AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
: J+ U9 a) T, O" e+ U
( G9 t2 n$ c9 x% H1 P1 hwww.newmaple.com/video/autocad0006
" m, O, [" X/ h  R3 a7 a1 s
0 C2 R* X9 y) Z6 q1. Title block brief introduction

" c# @+ f! W6 y. K9 }4 N) k2. Text height
; E# d1 f0 j0 X* E0 p, N, }8 o
3. Viewport
4 o) @" v( H7 o6 D5 a- X
$ g& [2 [$ a! h4. Dimensions style brief introduction
* ~2 u5 y) K) b•        Tolerance in Mechanical / Autocad
& Y  ]' L& o2 f: @1 i$ A0 j# B; B
special symbols
7 g) M7 X1 I; I6 N%%D degree sign
%%P plus and minus sign
4 s3 m& G3 x# w/ t%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
" N. w1 B2 C0 U5 c! s7 P$ zAutoCAD 实战讲座第七讲
) X+ x9 V8 v2 J9 M5 N; t! oNew Maple AutoCAD (7)
& S3 I1 k) f6 E6 x7 {www.newmaple.com/video/autocad0007

A real sample to review lecture 6
" u6 _$ O7 }, f3 H
Introduction Roughness
Quick check hole size and position
Introduction O-ring groove

  }, e, c* r1 n9 `; v# h7 eSurface roughness
- K7 l% e4 t; Y6 G•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
8 H: a# q& k2 t4 h* ^•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
9 y- k9 V( ~+ n% l9 V! Z# e•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
5 Z2 X' @5 X2 v9 f; |
Inch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
; G- ^+ J4 ?5 n# l! `5 j, _•        Actual size 2.734”x3.012”x0.139”
( F3 P0 @; N0 D1 w% J•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size
" P& ^  N$ p' ?
http://www.newmaple.com/forumdisplay.php?fid=28