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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2 R$ f( M6 \/ A6 V, w! n" U0 u& g- P9 y
AutoCAD 实战讲座第七讲0 i+ \% K0 N: e( [% O0 r
New Maple AutoCAD (7)( D+ ?2 V9 }- q I b2 S$ {- j3 ]
www.newmaple.com/video/autocad00072 O+ ]9 X: h! f, i& {- u
: h! y# @1 _4 JA real sample to review lecture 60 ?- o" V7 n7 H! g2 a
% C& H4 J; F3 q. L- T( N5 V; {Introduction Roughness
1 o _9 G1 V, l0 P7 z' _0 DQuick check hole size and position
6 A) v' Q7 R, W% a V& _2 jIntroduction O-ring groove
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Surface roughness9 j( g- _0 x- H T' p6 G
• Imperial Unit: micro-inch 10-6 inch. h# J: W& j$ v, E
• Metric Unit: micrometer 10-6 m
H" V+ M- r/ T/ j• Sample 250 micro-inch = 6.3 micrometer
% `7 n; z, p! @1 T- \' P(250X25.4X10-3)
. F6 t a8 T- F( d+ }: C! B% z• 250 micro-inch – forging surface+ u$ N; z6 I- Y, @4 L6 @% y, K# b
• 125 rough machine, 32 fine machine2 o. N4 L/ U3 C" Q! v; v0 Q8 q5 [
, P4 ^8 m1 K6 \9 D8 k8 KInch size O-ring ]. m: b2 U4 Z& O8 Z6 S; M( P# {$ S
• O-ring number 232* l" q& x) \$ i0 G- r1 S9 f& w
• nominal size 2.75”x3”x1/8”
( Q6 o) g7 Z! X2 s% h6 ~3 ^• Actual size 2.734”x3.012”x0.139”
. t! y# K& B* M; C% I) o+ s: t2 O• Static surface seal groove depth 0.101~0.107 about 25% squeeze( s' l* T; ]( h5 A5 q1 c
• One of OD or ID is close standard size" {$ N T( X: x/ i4 N7 R: `
9 u- H; r7 R- R& nhttp://www.newmaple.com/forumdisplay.php?fid=28 |
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