 鲜花( 0)  鸡蛋( 0)
|
楼主 |
发表于 2007-12-3 12:38
|
显示全部楼层
[V] AutoCAD 实战讲座第七讲
/ H3 \9 ^7 Z/ v& s, CAutoCAD 实战讲座第七讲8 j7 r3 l! M0 X
New Maple AutoCAD (7)& C$ e# c& j+ k7 N
www.newmaple.com/video/autocad0007+ m$ D2 c( t2 _6 h3 r2 B. z
% P: O( A4 v: n$ H3 J
A real sample to review lecture 6$ E; H& j+ e' j M- m$ ^5 T- i4 o
4 |" q/ ~, r. D( a9 @# b, ?5 rIntroduction Roughness
+ d5 F3 T2 q( I) p0 Y2 _Quick check hole size and position
7 _; f# ]0 ~9 X, X, y# {; }Introduction O-ring groove! K2 p# ? p; a& q
4 J' _6 [1 Y8 U' ]% n5 L n9 N
Surface roughness a: v/ `6 M1 Y
• Imperial Unit: micro-inch 10-6 inch
+ z! k! U0 Q; l+ H5 i3 I+ V$ c• Metric Unit: micrometer 10-6 m
& o* a# O0 {" h2 P9 { ]• Sample 250 micro-inch = 6.3 micrometer$ H3 N$ ^* K- k; e
(250X25.4X10-3)/ I. ~( h8 G/ f; v: T* z, R, @. ~
• 250 micro-inch – forging surface& l4 y# C5 [" V' Q
• 125 rough machine, 32 fine machine
6 F2 P8 G4 E0 `, q+ j% ^- h3 d# Y# R5 |# B l: ]& i# x
Inch size O-ring0 k: s. ^7 ~4 U& Y( x; i: l/ q
• O-ring number 2320 y9 k: d, V- h) x
• nominal size 2.75”x3”x1/8”
) Q7 Z% P1 |. m) H6 C, n• Actual size 2.734”x3.012”x0.139”
& U, T- t' N& g/ x: N7 o6 w) v• Static surface seal groove depth 0.101~0.107 about 25% squeeze |$ j" H; }! ^: c& }
• One of OD or ID is close standard size/ {4 x) N/ Z$ g2 F o
. ^4 ^& `8 E" `3 {" }
http://www.newmaple.com/forumdisplay.php?fid=28 |
|
狗仔卡
发表于 2007-11-24 13:32
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
显身卡
