AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
' e0 i) b" I. N) [0 hhttp://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006
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) \/ m$ H- w: g1. Title block brief introduction

; p, q( E. s  q1 U' r* @0 g2. Text height
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3. Viewport
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% m" R! Z  j/ {; R4 I6 y4. Dimensions style brief introduction
4 ~# q4 {( x) e# }4 J/ [•        Tolerance in Mechanical / Autocad
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! f3 H* w5 D2 M5 rspecial symbols
%%D degree sign
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%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
" |2 s4 X3 ~  X6 G& PAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
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4 U- z+ s+ a3 h* aA real sample to review lecture 6
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( @& u2 a5 [* b1 V2 D- z9 y/ zIntroduction Roughness
& c9 V# Y; H, y4 `; qQuick check hole size and position
Introduction O-ring groove
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2 v- I  }7 ]* j1 C: p& ESurface roughness
" M8 Z+ w1 n: m2 Y+ e: U" f' d•        Imperial Unit: micro-inch 10-6 inch
( }- f/ Y, F$ Z. l- W•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
6 Z0 f. d% j% @. t+ h•        250 micro-inch – forging surface
$ o- H5 ?8 S# _9 T' l•        125 rough machine, 32 fine machine
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Inch size O-ring
' [. X" I4 b& J" {. R•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
3 n' ^4 L) `/ V  P- l8 R•        Actual size 2.734”x3.012”x0.139”
6 D( {" b+ e3 W& Q# i•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
/ \; I& \  c9 L) j* x- z( k•        One of OD or ID is close standard size
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