AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006

1. Title block brief introduction

2. Text height

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

special symbols
%%D degree sign
+ Z. O7 z) e0 S%%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
4 D9 m  G  q* H4 \1 ]New Maple AutoCAD (7)
4 V/ E' D: s. c( c6 a+ Jwww.newmaple.com/video/autocad0007

A real sample to review lecture 6
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" O/ O7 a% V& M1 X- d# M- s! FIntroduction Roughness
Quick check hole size and position
4 k, G3 v- _) WIntroduction O-ring groove
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' r" G) a& N% g, TSurface roughness
. ]' W0 j, d- S! Q" V•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
! I1 W" \4 C) Q+ R. v; n•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
8 B/ \# m% H7 l4 t5 P; U•        125 rough machine, 32 fine machine

' a( Z( j  i2 ]Inch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
2 P8 J7 F; J9 r. t•        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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http://www.newmaple.com/forumdisplay.php?fid=28