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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
1 `+ @& V2 Q$ k5 }AutoCAD 实战讲座第七讲- F! X" p. s9 D- ? Y/ l, q
New Maple AutoCAD (7)
! \1 b+ b$ y1 {* E7 n8 ?% d: Ewww.newmaple.com/video/autocad0007. d% ^; M6 e: V' u
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A real sample to review lecture 6
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Introduction Roughness R2 T% @. `2 p& T6 D+ I
Quick check hole size and position' e3 F& P$ c* b. ^/ |; Y. }
Introduction O-ring groove) r+ p) N3 T0 ~1 H# j* k. p( y5 [3 C
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Surface roughness
# p# y' I+ v% D, C6 \, Z• Imperial Unit: micro-inch 10-6 inch$ }, P9 y7 j) o7 K
• Metric Unit: micrometer 10-6 m
4 z, D4 q [$ ^6 m1 g• Sample 250 micro-inch = 6.3 micrometer( r( t+ g$ n; W, o/ ^. X# ]0 U
(250X25.4X10-3)
7 ~5 o- Y* `2 M5 d( i2 H• 250 micro-inch – forging surface; T' ]2 m* `6 }: u |6 [
• 125 rough machine, 32 fine machine
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$ Y' V: G) Q1 M% S& h; tInch size O-ring/ K) o7 [% U' g$ y8 }/ B+ O
• O-ring number 232: i' p: C* I/ }, ~8 n, m+ v
• nominal size 2.75”x3”x1/8”7 f) K+ J" v* x" ^6 N
• Actual size 2.734”x3.012”x0.139”
9 A8 P$ B: Z& i3 L+ i7 V• Static surface seal groove depth 0.101~0.107 about 25% squeeze
' b3 C# T: A$ L+ U2 p& z• One of OD or ID is close standard size0 Q7 h: [) F6 I! q4 T
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