AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
6 X' h6 t) E) r, Y1 R7 Hhttp://www.newmaple.com/forumdisplay.php?fid=28

" T  a$ d$ K7 m7 U: y- N" Y& Swww.newmaple.com/video/autocad0006

1. Title block brief introduction

0 m  {# C% _+ ~/ p& F2. Text height
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3. Viewport

# v4 i' U( ?; y/ Q, R6 A4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

special symbols
4 k9 T+ y) ^- m: P%%D degree sign
  k% N% m& f7 C, k  ]%%P plus and minus sign
4 B0 _; _) T6 r%%C diameter symbol

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
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

4 e7 k9 K, M0 SA real sample to review lecture 6
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- \9 i: [# P1 n1 y, H4 u9 ~. ?Introduction Roughness
Quick check hole size and position
: Z( H5 H/ ~9 PIntroduction O-ring groove

Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
6 p; Y0 g5 E5 P* K  x  V" A•        Metric Unit: micrometer 10-6 m
" B2 ?8 A# x9 n) Z4 a  c5 O: N. f•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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( m$ p0 f0 R4 m  p: dInch size O-ring
•        O-ring number 232
•        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
% E0 u0 ^) ^6 V; A" A' C/ l. C! W•        One of OD or ID is close standard size
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http://www.newmaple.com/forumdisplay.php?fid=28