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

- x4 {9 N* A5 \( a0 b$ h2. Text height
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3. Viewport
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% [7 h7 w4 S2 f! d4. Dimensions style brief introduction
! ~' \  O! O8 V) P* a•        Tolerance in Mechanical / Autocad

% K6 O' w+ d; ~0 R. X7 }special symbols
%%D degree sign
8 K2 T9 I2 F$ P6 o3 ]%%P plus and minus sign
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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
6 }# F, K( L2 n+ lNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

( u) d3 k  k/ @" q/ M7 ?( N& pA real sample to review lecture 6

" [6 G/ I8 {2 Q8 @- @% G3 U/ VIntroduction Roughness
Quick check hole size and position
# b" ]8 U+ k: w/ L2 ?1 eIntroduction O-ring groove
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5 s  N. p' L2 J2 q9 N4 y& vSurface roughness
5 W8 z# C( `0 ?6 O' J•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
3 g: ^. N4 p7 N" V" i" @5 g( C•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

5 Z) B( ?- m+ @$ `( GInch size O-ring
, A' a" N7 ]) ], G5 p•        O-ring number 232
* P( F7 `" f$ G( j# F% W, X•        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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http://www.newmaple.com/forumdisplay.php?fid=28