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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
g7 w2 Y" f4 R0 m/ `) pAutoCAD 实战讲座第七讲
8 K4 H% e; T' g0 e/ ~New Maple AutoCAD (7)
$ a# K+ h4 V. y) y# y: B. S6 Xwww.newmaple.com/video/autocad0007
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. E* K m6 |# {3 nA real sample to review lecture 6+ i' r0 v) c) }9 F& w% y
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Introduction Roughness; v2 @2 G4 L" d6 J
Quick check hole size and position8 U$ @0 C5 N- z
Introduction O-ring groove5 b2 M* n5 \7 s1 J7 m
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Surface roughness
$ A; y# U7 @; O5 u+ n• Imperial Unit: micro-inch 10-6 inch) [2 @7 U! u: S' j! O, C# o C
• Metric Unit: micrometer 10-6 m
( _$ X |( v, R/ Z# L7 U, w• Sample 250 micro-inch = 6.3 micrometer( Z. B& N, s8 g6 M
(250X25.4X10-3)
4 j7 y! w$ w$ B• 250 micro-inch – forging surface
. \- d. y! d: m1 ]# d• 125 rough machine, 32 fine machine
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Inch size O-ring
% b+ l9 S' x( U1 D• O-ring number 232( w% `8 x5 J) a# V: e9 l8 r6 l3 ?* Z
• nominal size 2.75”x3”x1/8”7 B2 ~( S! h( S
• Actual size 2.734”x3.012”x0.139”5 C" ~8 L3 `* g+ P, v/ o
• Static surface seal groove depth 0.101~0.107 about 25% squeeze
4 e7 d* R0 C9 ~" Z& K# a' E• One of OD or ID is close standard size. D! _5 }, Y$ x
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