AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
- a3 x* }4 h9 _http://www.newmaple.com/forumdisplay.php?fid=28

/ H9 K1 a! C5 C: F0 j; l0 Z  zwww.newmaple.com/video/autocad0006

% }7 q* s9 \1 @1. Title block brief introduction

2 n) f* {, j) _+ C' x2. Text height
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9 y0 [/ ]% t( u! W9 D" x3. Viewport
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4. Dimensions style brief introduction
+ C, d, q5 \, D- O7 G  \- ~•        Tolerance in Mechanical / Autocad

& D- {4 I$ `. o3 E' Rspecial symbols
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, I( {: B! z; C! l6 ]/ ~%%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
# [$ b7 Z% i! s7 X' MAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
5 `. o. V. g2 _* {" _  W5 Hwww.newmaple.com/video/autocad0007

" G6 Y% i& ?+ i3 tA real sample to review lecture 6
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5 a  R4 i( N. D4 a# [. P( vIntroduction Roughness
* r* n7 i" c8 ]) L) n" hQuick check hole size and position
, \( ?' e. Y% x. I8 g  N% i5 lIntroduction O-ring groove

4 G6 J* d. V! o7 WSurface roughness
3 @7 ]2 L1 }, v. i/ \•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
0 n7 o& t9 M7 H6 [0 Q. ]' g(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

% b, m1 B6 ]. F$ ~+ k5 O& `% rInch size O-ring
0 a7 B' L* C2 W  e7 _•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
9 E# g! {6 d7 V) R( J6 v$ s% H•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
0 c- o) {- ?! {/ X3 ]•        One of OD or ID is close standard size
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