AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006

( g6 C( g5 U# a* J- L; q1. Title block brief introduction
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2. Text height

3. Viewport

3 o- |9 y# C' y& S+ Q4. Dimensions style brief introduction
( U+ v( W9 X6 N' F. m& v4 L" @•        Tolerance in Mechanical / Autocad
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2 a) F5 F& w8 d! e" x" ^special symbols
%%D degree sign
* d* C# `) c% V%%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
  B9 T7 a4 B( L/ [; h& m% c$ EAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

A real sample to review lecture 6

& S0 S% M' |, z5 C8 Z. hIntroduction Roughness
2 h( R* D. Q# a; tQuick check hole size and position
Introduction O-ring groove
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5 q0 p8 a! F3 D1 @/ `( E6 H9 PSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
8 w( @5 s5 g# F+ `* c" C•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
4 c6 L% W3 ]9 K4 |6 k' o•        O-ring number 232
* m- j- P4 z1 g" F, G4 g3 m1 Y3 Q5 P•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
/ `6 p; P; T( r7 F+ i  Z/ M•        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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6 I( D; {: S  N( m+ k. Whttp://www.newmaple.com/forumdisplay.php?fid=28