 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0 K( C. o* K) w( m4 N
AutoCAD 实战讲座第七讲1 p0 j" u- M1 u: S' [" M( w
New Maple AutoCAD (7)
1 R+ j/ u. P8 b: S Q7 Uwww.newmaple.com/video/autocad0007
- e( g' F6 ~! y! s8 b/ F5 D* F2 L Q0 `
A real sample to review lecture 6
+ Z. f; n) ^1 }; Y5 z. P9 c$ C& h. L# G; d0 m7 \. _; s
Introduction Roughness1 w2 u( l" y! E& x, o% W2 D8 [
Quick check hole size and position
9 l: J2 P' e3 l) t% S; j Y* ?Introduction O-ring groove3 ~" H" E% G, e6 D g
9 o; D# A4 ~2 [. }5 p6 OSurface roughness; f0 t' j2 _( W3 W
• Imperial Unit: micro-inch 10-6 inch" r; V! E2 w. s
• Metric Unit: micrometer 10-6 m
) i& \, r3 \# I• Sample 250 micro-inch = 6.3 micrometer) `5 L: N' X: H7 `! S
(250X25.4X10-3)
5 A8 k" i! w6 u9 H/ h! _• 250 micro-inch – forging surface- o# h- |) R9 @% e% Q( l
• 125 rough machine, 32 fine machine' s/ U7 `- U# \- G1 o
( D) A5 f9 o6 t' Y c' m% cInch size O-ring: A% I% k$ Y0 X5 u, q
• O-ring number 232
* O5 b+ n$ w7 L• nominal size 2.75”x3”x1/8”
+ d8 F6 r' v9 c• Actual size 2.734”x3.012”x0.139”3 f% v: X+ B, p- \0 F: X) R
• Static surface seal groove depth 0.101~0.107 about 25% squeeze4 ?" U) c* m( ^ B1 i" C
• One of OD or ID is close standard size `; Y' B1 U2 X/ O* r
. y: N' I! ?; f6 V/ V/ X, L7 Thttp://www.newmaple.com/forumdisplay.php?fid=28 |
|