AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
* ]& ?6 @, ~; o( @; A- {! Q6 v% bhttp://www.newmaple.com/forumdisplay.php?fid=28

+ ?( L4 |+ M6 ~  `5 dwww.newmaple.com/video/autocad0006
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1. Title block brief introduction

2. Text height
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3. Viewport
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% m4 y8 Z+ p6 r* d$ Z3 ~, s5 R+ q" s4. Dimensions style brief introduction
2 Y$ B) a1 E! r1 x9 _5 n% M•        Tolerance in Mechanical / Autocad

special symbols
%%D degree sign
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& _: ?% p2 a( K3 a% v, g; c+ p+ A%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
9 g5 [7 V5 D" z" {/ f! `% jAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
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! o( L/ p+ a- T# MA real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
4 {3 L* a' d+ F- }0 JIntroduction O-ring groove

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: C. Z( w) M: i( b! M  E( }•        Imperial Unit: micro-inch 10-6 inch
0 B. C$ J2 K. h% X% R) |•        Metric Unit: micrometer 10-6 m
" x3 I+ c% m; n, w: ]) t( r. U3 P•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
8 [  K" s! `" K. H' G•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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Inch size O-ring
•        O-ring number 232
* }7 H+ H( f) J( W) p3 y•        nominal size 2.75”x3”x1/8”
- O. {; Z8 P% p$ O•        Actual size 2.734”x3.012”x0.139”
0 \: x) b% I0 b1 M' x6 K4 j•        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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