AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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* V6 Z4 ^% y* g" q" ^www.newmaple.com/video/autocad0006

. q9 h% U* o- `8 i: X1 B1. Title block brief introduction

2. Text height
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/ J- w- D; T: n5 @. ^. G6 I' y) `# J3. Viewport
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2 U+ \0 p& n; u4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

) _( T) z% ^# B9 Jspecial symbols
4 ^2 y& j  \; z, }/ @6 Y5 j%%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
- i: d# _+ m9 Z  n# k0 CAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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A real sample to review lecture 6
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) d2 H4 y( T# KIntroduction Roughness
' k9 e* }: W& a( B$ ^Quick check hole size and position
Introduction O-ring groove

2 ~2 K8 D# ?6 ?! g0 i0 B) }Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
7 z+ f; f' k# A( ^- r) E8 p•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
: L+ q& W! e4 o9 ^+ }5 z•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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Inch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
! t/ K7 d5 Q  ?+ L7 t" K( _•        Actual size 2.734”x3.012”x0.139”
: y' d& l* e" D6 w4 e" c8 \7 `2 b•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
, n, P' ~) p& z1 L5 }•        One of OD or ID is close standard size

http://www.newmaple.com/forumdisplay.php?fid=28