AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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1. Title block brief introduction

- S# R) V5 ]! L! x7 b8 w. {# J2 e2. Text height

# x3 M& X+ M3 s  O* a& y3 `3. Viewport
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' {( Z/ k( w1 S: P- b4. Dimensions style brief introduction
  u/ i7 `$ x7 n- i0 l. v/ k•        Tolerance in Mechanical / Autocad

special symbols
%%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
, \0 t* ^' X3 W: v- Q5 _AutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
; x4 J6 I7 |- A5 Y8 D* f2 Zwww.newmaple.com/video/autocad0007

3 ~% J" e/ i+ z( \# X2 V) eA real sample to review lecture 6

Introduction Roughness
) c' a9 x3 O/ y+ J& \. m* yQuick check hole size and position
Introduction O-ring groove
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Surface roughness
$ J* x3 H: m& b/ `6 Z" v•        Imperial Unit: micro-inch 10-6 inch
- Z4 @: Z9 D0 t* z$ D0 z8 t•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
7 }9 f( F; u, A  h5 f* R  A0 w•        125 rough machine, 32 fine machine
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Inch size O-ring
8 ^5 v0 P! y% M8 s* m•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
. \$ ~# A- u7 E. j# X1 Z0 d•        Actual size 2.734”x3.012”x0.139”
6 z. i+ Z# `. ^•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

: |* M3 @6 q2 T5 t% W7 q% Ohttp://www.newmaple.com/forumdisplay.php?fid=28