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发表于 2007-12-3 12:38
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[V] AutoCAD 实战讲座第七讲
- r7 s { J( U$ q8 G! pAutoCAD 实战讲座第七讲* e- `+ b# G# }
New Maple AutoCAD (7)
4 I2 k% m& n* J, `& awww.newmaple.com/video/autocad0007
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7 z( e) C0 B( c' QA real sample to review lecture 6
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* `7 O- H* T8 i- K2 {; V7 [* _Introduction Roughness8 D2 R) H, A7 {! J4 s# p) a
Quick check hole size and position0 t n, c; K/ W+ D7 C( z
Introduction O-ring groove
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7 r4 U7 ?. X- L. DSurface roughness
$ ?+ H( m; n2 v/ _ M: j• Imperial Unit: micro-inch 10-6 inch, _7 x; S) \7 Z4 K* h
• Metric Unit: micrometer 10-6 m
b2 r% A$ Z" D# {3 f( ~6 v• Sample 250 micro-inch = 6.3 micrometer
" P9 |) U: [) L2 D- N; @2 y9 |# `(250X25.4X10-3)7 Z7 [3 G- g; M
• 250 micro-inch – forging surface
. X% F }# b- w& Q+ S• 125 rough machine, 32 fine machine
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7 ?! a% V/ } G$ K; r9 w" V0 ZInch size O-ring! E* X$ h4 b, I$ ~, |
• O-ring number 232
! }3 }+ C' q% u$ h' L. a& f• nominal size 2.75”x3”x1/8”- c+ |9 p2 T2 P$ [
• Actual size 2.734”x3.012”x0.139”
* X( _/ B% ?2 H: A- R) ~8 P' G* Q0 W• Static surface seal groove depth 0.101~0.107 about 25% squeeze
. f A; J7 p( q+ v• One of OD or ID is close standard size
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