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
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. Y9 S% d  e9 X+ `1. Title block brief introduction

. r$ ^( L3 G$ T$ T" ~2. Text height

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4. Dimensions style brief introduction
( \2 m! X' h5 R" E•        Tolerance in Mechanical / Autocad

" v: Q; m$ z5 J! mspecial symbols
%%D degree sign
; c4 H% r) m! F2 s0 ^. m! D%%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)
www.newmaple.com/video/autocad0007

A real sample to review lecture 6
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$ q; S& m6 F" S/ ~; F. mIntroduction Roughness
Quick check hole size and position
2 u. \, C% ?$ Y3 ]" ]% BIntroduction O-ring groove
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) t+ J- s. V/ P, \# ?2 TSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
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•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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0 Q' s+ X2 }& XInch size O-ring
7 c0 Z# L5 D; P•        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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$ [9 _/ {! ?/ Thttp://www.newmaple.com/forumdisplay.php?fid=28