AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
+ @0 P, m( `9 _. \: \4 yhttp://www.newmaple.com/forumdisplay.php?fid=28
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6 h+ z- Z) E6 E, W* T# x6 |www.newmaple.com/video/autocad0006

/ k/ Z- o) V' U8 Y& U3 p' a1. Title block brief introduction
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4 x9 Z' O6 o7 u% L  s! |3 P2. Text height

3. Viewport

2 G. D7 }6 A2 b! x8 S4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

+ J# b& a/ p9 A0 W6 z  J# Dspecial symbols
%%D degree sign
%%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
New Maple AutoCAD (7)
" `5 @" n/ x; r6 ]7 Ywww.newmaple.com/video/autocad0007

A real sample to review lecture 6
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Introduction Roughness
Quick check hole size and position
Introduction O-ring groove
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Surface roughness
4 u% C6 _+ ~9 O' ^5 H•        Imperial Unit: micro-inch 10-6 inch
" l9 K' S" q6 }5 L•        Metric Unit: micrometer 10-6 m
; j4 h9 a, _( E•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
8 t7 n7 |% [! [! A6 ~•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

' r* v$ n; |  E& F8 _2 ~' lInch size O-ring
•        O-ring number 232
$ ?) j0 j9 F7 e* M•        nominal size 2.75”x3”x1/8”
6 h5 S5 D2 r5 V8 w) t. D•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
& u4 [0 h8 ~; Q) G) a•        One of OD or ID is close standard size

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