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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$ V4 M5 J |) e1 `
AutoCAD 实战讲座第七讲+ c2 K' C9 R5 F3 V$ V+ Q
New Maple AutoCAD (7)9 I: ^+ n, j& n* T" W. G4 U X; E
www.newmaple.com/video/autocad0007
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' Y: P/ \" y0 R+ M+ y. U: VA real sample to review lecture 6
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Introduction Roughness
8 X W' H& U$ X- _Quick check hole size and position; |8 t1 d" S2 N$ X. n0 y: G
Introduction O-ring groove
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Surface roughness
1 i& H" E9 x T: I, k• Imperial Unit: micro-inch 10-6 inch
0 l$ m5 y6 X: G9 H& F• Metric Unit: micrometer 10-6 m$ V, H. r ?8 a3 q9 R+ m
• Sample 250 micro-inch = 6.3 micrometer
% z7 _' ?$ c( ?7 M(250X25.4X10-3)( @8 L# H" V4 Z4 T" x, Y$ r
• 250 micro-inch – forging surface# M# Z1 i: z+ G( ?
• 125 rough machine, 32 fine machine' B4 [. [3 J! ]8 m3 b* x
) N- q! N _2 X9 B& L# u* @8 vInch size O-ring2 d0 }# M) {& \) e% u) f. [3 ^+ K$ f
• O-ring number 232
+ j1 ]; ~) p) k! N6 [) P* B• nominal size 2.75”x3”x1/8”
6 ]' x/ q: r- n5 P9 `4 j; G• Actual size 2.734”x3.012”x0.139”( J6 G- t- `5 b* [$ h4 L0 [8 r
• Static surface seal groove depth 0.101~0.107 about 25% squeeze0 n! S1 t0 x' O; M3 v4 w0 R5 F
• One of OD or ID is close standard size& Q9 n2 S5 {+ Z1 x' w0 t$ I
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