AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
( D8 J& |6 O) V: ehttp://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006

5 i0 ~) b; N5 |: }. f/ ?1. Title block brief introduction

2. Text height

3. Viewport
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9 k. O- o  J; e' u3 s5 |4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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' g+ \8 S/ c8 aspecial symbols
$ N0 r# `# M9 }& a; E( K/ {5 b! M" t%%D degree sign
%%P plus and minus sign
! l: r+ y% C5 `3 I+ D9 l- N%%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
4 f( X& P9 _: `7 B) ENew Maple AutoCAD (7)
, T! H6 c! ?. i+ ]9 F9 awww.newmaple.com/video/autocad0007
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0 H) B; o% q9 m7 F8 F  p: y6 `A real sample to review lecture 6
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" ?; o  d' C/ [) T; w8 bIntroduction Roughness
% ^1 P. ]! n: J0 e& p" c9 R/ e) RQuick check hole size and position
Introduction O-ring groove

" M6 r& r: R# |3 s- [" PSurface roughness
+ K2 a1 u/ q; v6 \% C0 d•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
  r* O! Y9 l; E+ @; ^•        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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Inch size O-ring
2 I  A7 o1 S' m•        O-ring number 232
& P* [/ V+ Y7 U* d•        nominal size 2.75”x3”x1/8”
5 J6 F  {3 Z# Z1 b! u•        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