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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( Y6 |6 f) B+ q2 k2 O
AutoCAD 实战讲座第七讲) a9 i6 |7 O* r
New Maple AutoCAD (7)" b$ j8 U: |$ r: U s' W8 Z$ D, V
www.newmaple.com/video/autocad00070 ?# ]" D' y# [3 o1 ?! o% `; z
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A real sample to review lecture 6
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Introduction Roughness9 P4 ~8 S+ g. b: ?! S. i$ F
Quick check hole size and position
" r) r$ `6 S" N9 c( ]: NIntroduction O-ring groove; J7 ]2 }$ n( ?7 f% i- L& o; f
b* d- b+ X/ n9 X: r" pSurface roughness
2 a( }. W+ `3 x& p4 h• Imperial Unit: micro-inch 10-6 inch
( a/ U/ V; S; o* o( G• Metric Unit: micrometer 10-6 m s+ T1 e8 [) ^" `
• Sample 250 micro-inch = 6.3 micrometer
8 T' X9 O( w- j; ^1 w) s(250X25.4X10-3)! w2 o% {( Z% f, D2 K. g% ]" |
• 250 micro-inch – forging surface+ E) a4 ^3 K; w
• 125 rough machine, 32 fine machine" v) g* C, I# M% ^' g/ O2 ?
0 a& Y; \2 l# y5 u2 L9 YInch size O-ring% j R+ a- Y8 {
• O-ring number 232
1 f" p' o& }& B) a( J9 q& _• nominal size 2.75”x3”x1/8”
% ^' Q/ b" k4 x# W# S• Actual size 2.734”x3.012”x0.139”2 w& M, y* m6 M! @+ s x* e
• Static surface seal groove depth 0.101~0.107 about 25% squeeze
& S. i$ k c& ^& t/ Q7 l4 b$ Q2 g, d; n• One of OD or ID is close standard size
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/ W3 W. G3 z2 R; chttp://www.newmaple.com/forumdisplay.php?fid=28 |
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发表于 2007-11-24 13:32
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