AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
4 b! @" a3 h3 W1 |
www.newmaple.com/video/autocad0006
* B% u3 i8 l6 c9 Z! L  O
, t# u" t) n' n- t9 Z: S! p4 e. [6 o1. Title block brief introduction

2. Text height

3. Viewport

& C4 q% v! @7 S/ ^. |5 Z4. Dimensions style brief introduction
/ K& x. W9 E$ Z•        Tolerance in Mechanical / Autocad

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
AutoCAD 实战讲座第七讲
% ^/ Z- V/ F/ J  nNew Maple AutoCAD (7)
% s) |2 x# a. O, W$ l( swww.newmaple.com/video/autocad0007
" f% ~" p$ m* g" ~9 N$ ?1 v
A real sample to review lecture 6

  U/ m( q& d: x8 j. nIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove
" o  J4 p/ l' `; ]* [; d2 ^, H
Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
! x( I! {. f% x% d$ ?(250X25.4X10-3)
. S# x6 y( S5 y. P& S" E6 I( V•        250 micro-inch – forging surface
/ L' t2 u6 q% u) j•        125 rough machine, 32 fine machine
( r: x( d0 V$ I3 L2 p$ G7 s* h
3 D! [3 r/ v6 o1 eInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

  |7 W' M) a4 q4 Hhttp://www.newmaple.com/forumdisplay.php?fid=28