AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28

" p9 h: w% _0 b3 X8 Z; @) S4 Gwww.newmaple.com/video/autocad0006
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% w( g+ l8 e; ]' u3 W1. Title block brief introduction

$ ]8 S: u: H, T- F& R# @2. Text height
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1 `# \+ C$ p; {1 _3. Viewport
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4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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special symbols
%%D degree sign
%%P plus and minus sign
, j  y% o* C9 v$ [( j%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
7 H1 Y  ~5 e" v% S- d1 X& P2 fAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
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A real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
Introduction O-ring groove
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' S, |* t' j, o, n* L& RSurface roughness
! r' `- d5 D( {% B5 M, R•        Imperial Unit: micro-inch 10-6 inch
7 e1 `2 j0 [. t% R) o% y! J8 {$ Z•        Metric Unit: micrometer 10-6 m
: K  [7 d9 x/ ]( V8 g•        Sample 250 micro-inch = 6.3 micrometer
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! q4 ~5 G3 C' z, j•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
•        O-ring number 232
3 L4 H, F" k' u9 {" s5 y, y7 S•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
8 X- i5 o$ j& Y7 z•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
- `8 n# C* l+ }8 ~; ^5 _6 E: V; @•        One of OD or ID is close standard size

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