AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
8 m8 D7 X3 \9 V/ m  t5 yhttp://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006

0 |' f& b* I3 L! P5 Z! l$ x1. Title block brief introduction

6 F6 T' n4 v1 O( _! A2. Text height
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: }' m. p) T1 A2 E3. Viewport

4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

special symbols
%%D degree sign
2 L0 @7 t" {1 {3 m' T%%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)
& g, G8 {5 A/ c# [- K! Y" r; f) uwww.newmaple.com/video/autocad0007
  I: {' a5 w& G! H3 A) h7 J! F( c1 F
0 P' x; ^. S  z% lA real sample to review lecture 6

Introduction Roughness
% @: W2 k: U4 I; G, _# PQuick check hole size and position
% {# l& n2 ~& q& h4 L# JIntroduction O-ring groove
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9 r- m, B0 h5 x; F( qSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
& [) c3 B" v8 E# r# g•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

1 p. I$ d( ~+ W% i9 AInch size O-ring
•        O-ring number 232
+ e/ ]/ u9 K+ s" E6 b•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
: [8 \3 U2 s1 F* l•        One of OD or ID is close standard size

http://www.newmaple.com/forumdisplay.php?fid=28