AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
- c8 y" N% a1 c- Q- h0 Ihttp://www.newmaple.com/forumdisplay.php?fid=28
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& K! q$ B) m- A% l) p1 Z8 dwww.newmaple.com/video/autocad0006

* k& s$ r# C$ E& u1. Title block brief introduction

2. Text height
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3. Viewport

  o3 S0 {. x9 B0 j4. Dimensions style brief introduction
" L8 v& t* R, b% P•        Tolerance in Mechanical / Autocad

2 \- l6 b6 H8 c8 W" O; p. g' @special symbols
%%D degree sign
* k2 D' W" y- R, [1 a%%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
3 @* ~* W' U1 y9 mAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

A real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
Introduction O-ring groove

Surface roughness
* J7 N( p4 R) M( S$ q4 [6 C•        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
  m2 L" H& m' I+ p9 ]* b+ p( R- h•        125 rough machine, 32 fine machine

; B: V- C" U8 R2 M$ qInch size O-ring
  m- ]$ }7 d% W8 }•        O-ring number 232
& {1 t9 o) F6 _6 ?! D•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
) \2 K2 D; ~" G- K* L1 j•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size
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, J+ H( Z' {0 s2 a, i7 i: bhttp://www.newmaple.com/forumdisplay.php?fid=28