AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
+ w2 ?3 N# |4 M+ I. e/ S; X8 L& Fhttp://www.newmaple.com/forumdisplay.php?fid=28
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% a; e! |) T! o/ x) ywww.newmaple.com/video/autocad0006
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1. Title block brief introduction

2. Text height

( N6 O3 |0 f. ^  F( U$ ~& S1 L5 |3. Viewport
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: d( Q# X5 j% p5 h4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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: f$ _% f9 G/ V9 pspecial symbols
3 g+ k/ R) v1 w3 I" b%%D degree sign
%%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
% H1 z/ T* a  ?3 X" pAutoCAD 实战讲座第七讲
8 N% w' l7 D" V/ C) v% V0 eNew Maple AutoCAD (7)
5 ~& S- c  B& u" O. S. }& Qwww.newmaple.com/video/autocad0007
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A real sample to review lecture 6
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Introduction Roughness
4 v& l7 G6 N; i1 ZQuick check hole size and position
6 r# g. U! c1 H% O( R: n6 EIntroduction O-ring groove
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/ Z& a) u) X- wSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
$ o" I+ c/ T' Q0 M•        250 micro-inch – forging surface
, J7 O  d3 c) h( |+ B•        125 rough machine, 32 fine machine

3 o1 a( U. X0 z, u( Z# S- LInch size O-ring
•        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
( A; i1 F+ l3 d: s1 U% Z& j4 k•        One of OD or ID is close standard size
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