AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
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www.newmaple.com/video/autocad0006

1. Title block brief introduction

2. Text height
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( i5 e5 }6 z1 j2 M3. Viewport

, i* J% h, P# E4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

2 C' G# w% N0 V/ h: zspecial symbols
%%D degree sign
%%P plus and minus sign
3 I; M+ J: W* n( `2 M- k%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
. m# N2 r7 y* C& x! e# B; PAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
  |" g/ g0 m- m5 J8 C' i1 Z) Rwww.newmaple.com/video/autocad0007

A real sample to review lecture 6
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( Z8 [+ E- a& ~Introduction Roughness
2 A  d! q; U1 U  _( cQuick check hole size and position
" T3 O) n5 D8 ?% J% n9 A& V! zIntroduction O-ring groove
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Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
6 |# ~$ i# u; u•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
6 z4 E+ D( w; v5 U•        250 micro-inch – forging surface
) u: t6 K* |) c8 g0 `•        125 rough machine, 32 fine machine

' J+ K* Y% C: \4 m' [! rInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
5 S6 b1 M6 W9 ?% U) u•        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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http://www.newmaple.com/forumdisplay.php?fid=28