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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 Y$ j3 e) k$ B' \6 G
AutoCAD 实战讲座第七讲
7 }1 _- Y$ \ _" A1 L+ A2 I6 U4 X5 m7 \New Maple AutoCAD (7)" W0 j7 Q" |% `' S; \+ i
www.newmaple.com/video/autocad0007& N4 D/ R0 S% K
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A real sample to review lecture 6
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) c' ^% |8 L+ r. U; I7 m* b+ {Introduction Roughness/ d. `' W3 K. {5 }
Quick check hole size and position' S. a; I5 C1 j8 X! h, G3 {
Introduction O-ring groove
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Surface roughness
$ u- y& A6 w4 _# x• Imperial Unit: micro-inch 10-6 inch! ?+ u7 v& \* \- [" M
• Metric Unit: micrometer 10-6 m
% R) z# L4 A7 n+ q! f3 L# m• Sample 250 micro-inch = 6.3 micrometer
8 j9 I0 D9 A" S- e% W% \4 m(250X25.4X10-3), r2 s, I/ K3 W5 I
• 250 micro-inch – forging surface
2 _, v5 H: w3 Y4 D4 ?' S• 125 rough machine, 32 fine machine
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Inch size O-ring8 ]( n; o( J! e# I2 |. e! C
• O-ring number 232
* D, E$ E9 X7 h. q. E, q( ^, t• nominal size 2.75”x3”x1/8”# I% d1 X6 x0 `' Q; ?
• Actual size 2.734”x3.012”x0.139”7 C- o: X: D6 G" {8 }
• Static surface seal groove depth 0.101~0.107 about 25% squeeze! N' v+ O1 X# x9 w" P
• One of OD or ID is close standard size
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