AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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8 f- n5 ^6 \3 J7 H) dwww.newmaple.com/video/autocad0006

1. Title block brief introduction

! s1 E1 i% x6 G9 q2. Text height

3. Viewport
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$ e+ g, j0 X7 Q5 [# |4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

( l& t" K3 Z+ m& X! gspecial symbols
%%D degree sign
%%P plus and minus sign
5 P. X' g7 [) a  [7 }4 d: k2 X%%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)
www.newmaple.com/video/autocad0007
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+ T- C# V6 Q+ r% ^4 {% l0 q/ @5 bA real sample to review lecture 6

; [% z$ L: Z  p, h9 rIntroduction Roughness
( T, F4 c: w# }, }Quick check hole size and position
Introduction O-ring groove

Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
4 V+ E5 g: P" d: U•        Sample 250 micro-inch = 6.3 micrometer
4 Q+ Q% C9 d  y. T" A( E(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
, b4 N7 t' u2 d5 {•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
" ]+ ~! m, o7 W" ?•        Actual size 2.734”x3.012”x0.139”
& w4 q5 d6 i# C•        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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0 `4 a, p% V. \4 a+ m* F% Shttp://www.newmaple.com/forumdisplay.php?fid=28