AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
4 n8 k# K& Z- o& F% Lhttp://www.newmaple.com/forumdisplay.php?fid=28

3 b6 [4 D& ~* U0 n! G/ h- ewww.newmaple.com/video/autocad0006

1. Title block brief introduction

6 V7 h: {8 p& w3 ]2. Text height
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8 j- \1 Y/ u' c" O3. Viewport

4. Dimensions style brief introduction
6 r3 k7 w* E) R•        Tolerance in Mechanical / Autocad
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. o5 @0 o2 {5 Xspecial symbols
%%D degree sign
%%P plus and minus sign
. Q: p+ C$ q3 o1 p3 g! Z+ s8 G  }%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
/ V+ P7 p& O  e- FAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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, g* u+ C5 Y7 Y0 j5 y1 OA real sample to review lecture 6

4 T3 E8 |/ l2 G& u! HIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove
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Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
2 r' g: D  }: A2 Z) T0 \•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
7 @, |* ?# h1 E# s% J$ l•        250 micro-inch – forging surface
/ Z: l' T# ?9 L( G* u) k•        125 rough machine, 32 fine machine

Inch size O-ring
! C6 n  c7 R5 u/ y* _) P7 X, d" J1 `: `•        O-ring number 232
- C5 Q& L0 s) l( c  S' K* U•        nominal size 2.75”x3”x1/8”
2 b  |- ?6 \, b( G' c- U. ]. i6 D•        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