AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006
4 F  v) G; {5 {+ V
1. Title block brief introduction

2. Text height

3. Viewport
' V* p$ U4 z4 g& @
4. Dimensions style brief introduction
/ x9 y! A2 L; z% w: u% f•        Tolerance in Mechanical / Autocad
) Z* M2 d% c' r  J0 ]+ C
special symbols
%%D degree sign
%%P plus and minus sign
%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
# U  L' a, i' S5 BAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
( S9 x1 f9 ^" F( {
A real sample to review lecture 6

Introduction Roughness
+ M" Z4 E# Z5 _  FQuick check hole size and position
* n) g% t( c4 }; T( EIntroduction O-ring groove
9 o; d: x: w6 m
% F, v7 v* Z7 wSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
3 ]: z& c% n. y0 D9 Z# H•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
$ H5 m* {/ C! q! S) ]•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
6 `0 S; Y+ W$ I; R; I9 H+ `
% _+ Y( r( u4 s2 f$ [6 I& a% i6 zInch size O-ring
•        O-ring number 232
, `( g  f6 |% O. ]# x•        nominal size 2.75”x3”x1/8”
- m$ G# b3 s2 V8 N4 O•        Actual size 2.734”x3.012”x0.139”
8 ?" ?  X; n, e% b% x9 l  H•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

http://www.newmaple.com/forumdisplay.php?fid=28