AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006

& [. w# G7 m: m/ q1. Title block brief introduction
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2 M+ C) a' M. u( g6 m2. Text height

3. Viewport
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* @" R* g5 `4 [9 J/ c% g: l4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

2 Y, _7 `9 ~5 |8 v7 `' S( {special symbols
# x. o) [* q, ]" @%%D degree sign
%%P plus and minus sign
$ \6 C3 @  V$ `2 z/ c%%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
# T5 e  F2 R8 N+ F& j6 yNew Maple AutoCAD (7)
6 H9 d* s. e6 E$ a' iwww.newmaple.com/video/autocad0007

A real sample to review lecture 6

$ \) D. v0 F9 L6 C. L3 bIntroduction Roughness
8 E1 j* J* q* q: |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
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
( E9 Q+ X( ^3 r% L( e) r9 x•        250 micro-inch – forging surface
: y) y8 B) q( o1 Q& q) c•        125 rough machine, 32 fine machine
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" N/ e* E1 y$ Z, T4 G# v( YInch size O-ring
•        O-ring number 232
, _! |8 L7 u' [; v4 G•        nominal size 2.75”x3”x1/8”
( E3 [$ y7 A( w; [& `. p5 j0 A; K•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
2 W/ M. [" T! q2 W- C  ~& \0 N( m•        One of OD or ID is close standard size
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, K1 L% U: G  y' I2 i- H# H( qhttp://www.newmaple.com/forumdisplay.php?fid=28