 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$ f0 a7 H+ J1 X
AutoCAD 实战讲座第七讲
2 h/ @! L1 N0 ~0 a- I1 u6 G0 `$ _5 }New Maple AutoCAD (7)
# ~! N! \' X/ q3 g: f9 {7 twww.newmaple.com/video/autocad0007
5 X5 z6 C* M3 d( G1 @, }3 j8 M% X
+ V8 f" d6 `% t5 DA real sample to review lecture 66 r! \) Q% o2 e8 V3 X0 c- i
/ D: [$ B+ T3 j) I( UIntroduction Roughness
: s" V0 p& H6 S, d8 UQuick check hole size and position4 N) K7 w3 }1 K* E7 c, h
Introduction O-ring groove
4 U: t D! E I) P8 @1 R
) l) P7 J/ R. `% ~% U3 d( A5 hSurface roughness
x8 A: y: P1 W( P- T0 i4 z• Imperial Unit: micro-inch 10-6 inch. |- L# Y) e! M! }* j- i
• Metric Unit: micrometer 10-6 m
9 Z* x ]! u2 C h+ [" F! x• Sample 250 micro-inch = 6.3 micrometer+ W9 Q4 H( U8 } R+ C h4 E. M2 B
(250X25.4X10-3)
+ X7 y1 o! \- B" ]3 Q* P2 q• 250 micro-inch – forging surface; L$ P' P) \& k) C
• 125 rough machine, 32 fine machine) I9 d( H" J' A; [; o5 O
) Q. N! j1 ?# J$ n* v. Y
Inch size O-ring, N5 i4 i1 k( t* N
• O-ring number 232! }2 e+ M, G4 C9 ?% D* P" m, P& R3 Z
• nominal size 2.75”x3”x1/8”. {" G! I$ D1 e% ]' O/ h4 m
• Actual size 2.734”x3.012”x0.139”( [# }6 B }" G& |7 y* ]; C
• Static surface seal groove depth 0.101~0.107 about 25% squeeze! M6 b2 `% H4 i3 v S- z
• One of OD or ID is close standard size
- \7 A% H K) k) \4 w5 p& H* H" U- Y( q+ O0 e
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
