AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
5 l- p# y- Q& F8 @- }
/ j7 x$ Q! Z  owww.newmaple.com/video/autocad0006

1. Title block brief introduction

& }' I, Q( Y6 o2. Text height

3. Viewport

4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
  W  \8 z3 I. Z, n/ I! ~: z2 F3 K, G
special symbols
%%D degree sign
( U% s+ J6 }* V0 x% V* B) B%%P plus and minus sign
' S1 ~) P) L( R7 A8 N%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
1 `+ @& V2 Q$ k5 }AutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
! \1 b+ b$ y1 {* E7 n8 ?% d: Ewww.newmaple.com/video/autocad0007

A real sample to review lecture 6
1 t+ u% ]5 T+ `
Introduction Roughness
Quick check hole size and position
Introduction O-ring groove

Surface roughness
# p# y' I+ v% D, C6 \, Z•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
4 z, D4 q  [$ ^6 m1 g•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
7 ~5 o- Y* `2 M5 d( i2 H•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
" B! q* E. k9 |! U* \% r
$ Y' V: G) Q1 M% S& h; tInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
9 A8 P$ B: Z& i3 L+ i7 V•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
' b3 C# T: A$ L+ U2 p& z•        One of OD or ID is close standard size

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