 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
3 {& C; n9 D/ B( R* Y) BAutoCAD 实战讲座第七讲
4 Q. T. P* |4 u: H. i# nNew Maple AutoCAD (7)9 s7 w# ~: T* E! Y- L( c
www.newmaple.com/video/autocad0007
5 E( i( `: b/ Q; w5 L$ Z% C3 y; ] y: g9 u8 k* Z$ S3 d7 `2 }
A real sample to review lecture 6- _, U7 P' t+ j: h
9 g4 g+ v0 C8 J# l3 Q8 [0 yIntroduction Roughness& {" D5 C7 }) ^# o6 B: [
Quick check hole size and position2 P2 Q$ ]$ `8 V; }6 K8 B" L1 W4 h
Introduction O-ring groove
7 O: c" U' L# `9 J2 a0 M, s; o7 w9 ~
Surface roughness3 `% N5 \; A l0 T* M n; ^# {
• Imperial Unit: micro-inch 10-6 inch0 P5 n) M& @' ^# q7 J+ G# Y( \: L
• Metric Unit: micrometer 10-6 m, V; q) C3 m2 U, U, j
• Sample 250 micro-inch = 6.3 micrometer' v! Z9 O5 K; y/ ^" A
(250X25.4X10-3)
+ {2 h/ Y; h4 h7 _: U• 250 micro-inch – forging surface
) L2 M( c( X k: ~• 125 rough machine, 32 fine machine; u& {; ~0 F9 \+ V8 }/ G* D6 B- B
) f" E7 N4 d1 b4 N$ {) w( r: }3 OInch size O-ring
1 u$ e/ {; C8 g' A# K/ M• O-ring number 2324 R# ]& o! l/ |
• nominal size 2.75”x3”x1/8”
1 w u) |& D& I• Actual size 2.734”x3.012”x0.139”
; g. o+ u; P/ o4 N9 k3 K• Static surface seal groove depth 0.101~0.107 about 25% squeeze
$ i8 q5 P4 q" K5 q• One of OD or ID is close standard size# j) I$ T2 Q% K, x, d
8 t2 p5 C# \' E# P; }" chttp://www.newmaple.com/forumdisplay.php?fid=28 |
|