AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
8 Z! w: X" ~) \0 @- t' ~
www.newmaple.com/video/autocad0006

1. Title block brief introduction
7 y" F% u3 \/ \$ i
2. Text height

3. Viewport

* b* b; ^/ z5 [5 q4. Dimensions style brief introduction
' D- G1 u+ J8 k! Z! n/ N- v•        Tolerance in Mechanical / Autocad

( w3 y2 d/ @# `special symbols
%%D degree sign
" Y( A' |; L. ~$ h( ]%%P plus and minus sign
7 y% V2 v5 s$ R# h- H" U%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
. R+ M# w. |% X1 L, Q  M6 d" K" kAutoCAD 实战讲座第七讲
, \  O/ j6 d) _( U5 c% ?New Maple AutoCAD (7)
3 p9 b0 k% Q2 F7 f7 h' Rwww.newmaple.com/video/autocad0007
: F8 M% c, s7 h  o  @% B" X
* ^4 E: z7 t2 ?/ m( `% VA real sample to review lecture 6
9 H, @+ Z+ g9 p
Introduction Roughness
Quick check hole size and position
Introduction O-ring groove
5 \  ^! O9 C4 Y2 i' C/ ^
Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
4 _: z9 `$ a- t+ e•        Sample 250 micro-inch = 6.3 micrometer
% S, e7 }2 O: E$ m  ?5 n(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
: Z$ p9 v1 @% [) P
' {0 h! O' L7 {- Z/ v) P# {Inch size O-ring
6 ~* ~8 s4 W2 Y•        O-ring number 232
; [, F9 Z0 {8 T6 q( V•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
& Y! [# o0 }  U8 Z•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
  q5 z' b7 Y: |9 f$ k1 p•        One of OD or ID is close standard size
0 A5 _, x+ n- ~- b" F9 d+ `$ m: i
http://www.newmaple.com/forumdisplay.php?fid=28