AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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7 z# @+ l) B; b' X0 uwww.newmaple.com/video/autocad0006
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1. Title block brief introduction
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3 C. d2 p* }% F5 @" G2. Text height

8 [9 b5 ~+ H9 s% ]' k/ m' T& Y3. Viewport
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6 O% B) l2 h* n; v. M4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

special symbols
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, y* C9 J8 p* ^$ U! f7 @%%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
AutoCAD 实战讲座第七讲
& }% }6 w$ l# |1 t2 {, m* DNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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0 }! ~9 K3 h) K9 Z/ G: VA real sample to review lecture 6
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Introduction Roughness
1 U. n' x+ Z# ~4 s, {* S, v! IQuick check hole size and position
  @- y1 u- S7 vIntroduction O-ring groove

Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
  p& S+ G! Z* T/ H1 O, f: {" w•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
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•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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Inch size O-ring
) b  X! G2 }9 ^# d•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
0 q5 m" \  I! B( {1 ?6 B# Z•        Actual size 2.734”x3.012”x0.139”
•        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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