AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
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www.newmaple.com/video/autocad0006
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1. Title block brief introduction

2. Text height

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4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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* [9 V3 z/ T0 g( mspecial symbols
%%D degree sign
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% V5 ^; j- F1 M%%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
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A real sample to review lecture 6
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Introduction Roughness
Quick check hole size and position
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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)
% U7 i, n+ C# {& d( k•        250 micro-inch – forging surface
( u$ m$ x# d( X$ ^( h•        125 rough machine, 32 fine machine

5 G5 X; [/ D8 b' PInch size O-ring
3 R( e4 A  U# J0 V•        O-ring number 232
•        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
•        One of OD or ID is close standard size

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