AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
, k2 L# h# a+ `  N# y: Qhttp://www.newmaple.com/forumdisplay.php?fid=28
% b" L) d2 b: F2 C* y
www.newmaple.com/video/autocad0006
; F/ x. S* r: }- p( @. @- S
1. Title block brief introduction
* c; X& l; k/ I% `/ ]  a: M
2. Text height
( l! G7 C2 p" X0 x  H
" E6 E3 J7 U7 Y1 w, s$ P3. Viewport
, ~% x! S: L: Q/ M/ v
4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
  y9 @& l$ H8 ]# M
" E- |1 g# F7 c6 Zspecial symbols
%%D degree sign
%%P plus and minus sign
# W4 u* ^( d8 d: ^, |$ N- R$ b) o%%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
New Maple AutoCAD (7)
$ y* H# o" X* u: bwww.newmaple.com/video/autocad0007

( E) M( v4 f& s, d0 OA real sample to review lecture 6

0 L$ B! {! U5 a2 uIntroduction Roughness
Quick check hole size and position
8 `3 f" L- D( ]+ h  x; p# dIntroduction O-ring groove
! u, f0 R4 [, q. x2 I+ l* z
Surface roughness
. z: B& P; s4 V& u8 L( L& h/ y•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
' E$ T: @# [- h% L
Inch size O-ring
7 v1 |  j! h5 Q/ t( X. B•        O-ring number 232
+ g; g4 C  R0 v$ B9 R" L9 y# U•        nominal size 2.75”x3”x1/8”
0 F- x) \  P6 V: g/ l•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
. A. @+ z9 I  Y$ {  T/ v•        One of OD or ID is close standard size
/ a) h" a: i0 M4 `" A* e3 y
http://www.newmaple.com/forumdisplay.php?fid=28