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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# _& \0 x# R8 B( N0 W
AutoCAD 实战讲座第七讲6 Z2 C" @& h( N9 c- t) z* W
New Maple AutoCAD (7)
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A real sample to review lecture 6
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' A1 F6 |# }$ ~( n9 W5 M! VIntroduction Roughness
9 Z$ E$ z2 f" h$ O" wQuick check hole size and position* b2 D: K' z A( H+ q# u% x1 \
Introduction O-ring groove7 O1 B& h K$ i0 ?8 ~ C8 y
. }1 o; y6 a6 {8 h# [Surface roughness
+ Y2 B" G0 V7 N. m9 t& V• Imperial Unit: micro-inch 10-6 inch" J. u3 r$ Y. P7 Z+ V5 E
• Metric Unit: micrometer 10-6 m
& s" z" d1 C5 P" r* G: u• Sample 250 micro-inch = 6.3 micrometer
) ]6 x# u, M5 W( f9 X R% D0 ^$ ]' A(250X25.4X10-3)
! q0 P5 K# z$ M! f/ J2 r/ ?+ x9 _) T• 250 micro-inch – forging surface
6 I+ O$ j4 ^ c, x• 125 rough machine, 32 fine machine! d3 K- K# T- {4 @, `- H
, `, }. n1 b! f! H, n; J7 r/ IInch size O-ring$ I1 O1 b; L! l; `' L: s, S: v
• O-ring number 232- e g" z3 `0 V. E7 T
• nominal size 2.75”x3”x1/8”) B+ H# i0 R) A1 r- p6 a0 V
• Actual size 2.734”x3.012”x0.139”( x o/ i# W! u/ ~
• Static surface seal groove depth 0.101~0.107 about 25% squeeze
9 c3 E" R+ D" n• One of OD or ID is close standard size
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