AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
/ a0 I& @3 t* s6 F* ~. P9 o7 b, fhttp://www.newmaple.com/forumdisplay.php?fid=28
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" @8 v% @1 ^; L  Ewww.newmaple.com/video/autocad0006

9 I2 I8 a  F$ `* D1 c1. Title block brief introduction
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2. Text height
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3. Viewport
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4 V! g' o1 k% ~4. Dimensions style brief introduction
8 `( e6 {! `  P, n1 W) }•        Tolerance in Mechanical / Autocad

2 [, E9 H2 V3 [$ Qspecial symbols
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* U0 L) \  w( ~, U  W9 j" d$ h%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
8 b% G1 @8 ], k% v% AAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
2 I* y7 L; t+ E- U0 Wwww.newmaple.com/video/autocad0007
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) R' c4 F, u" I0 W) IA real sample to review lecture 6
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Introduction Roughness
Quick check hole size and position
+ H5 j# a2 s4 {/ z% tIntroduction O-ring groove
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- _, V. z" n( f# [/ r) b% @: E( nSurface roughness
  g0 p. x, j: `•        Imperial Unit: micro-inch 10-6 inch
2 k/ `! N" G! W0 N. P•        Metric Unit: micrometer 10-6 m
4 m  D! j9 M2 e: t•        Sample 250 micro-inch = 6.3 micrometer
3 V; ]- W1 n0 ^* z; @; K+ R(250X25.4X10-3)
) H" ^' g: P) [  d5 E9 t•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
•        O-ring number 232
0 Y. d; G& {8 w+ E/ e6 u7 j. }" L5 G9 l  e•        nominal size 2.75”x3”x1/8”
/ O$ s# |7 W) t- ~: B, a8 Z& y$ O! x0 v•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
$ X9 V3 q/ M% y) `7 X$ x, T•        One of OD or ID is close standard size
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