AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
' T0 K3 q- i7 h- M0 u8 m4 j; Bhttp://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006
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1. Title block brief introduction
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9 I6 M8 r+ i/ g0 [: G2. Text height
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3. Viewport

. \8 P+ u: W  Q7 M4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

special symbols
%%D degree sign
: |8 J9 a; J2 }  f( g7 `- {. @! `%%P plus and minus sign
" A0 I7 K: Y* X1 N%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
AutoCAD 实战讲座第七讲
) ^: v* r/ W  aNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

; i9 l& J& G: D9 T- |% nA real sample to review lecture 6

$ H" s( b( o+ eIntroduction Roughness
; j" o# I3 g$ `  [. _! xQuick check hole size and position
9 w, Z0 `& o) {; {8 ZIntroduction O-ring groove

Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
; O) g; x$ p/ D, x* R+ G  a: ]•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
9 Z/ S4 e& f3 h•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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+ `4 n5 u$ ?. b5 n" q( jInch size O-ring
9 B- Z6 U  Z% L. A( e2 u•        O-ring number 232
: O+ k" [/ h: T•        nominal size 2.75”x3”x1/8”
% n$ W) q, u, F+ ?9 [% U•        Actual size 2.734”x3.012”x0.139”
: O5 [1 F1 p  q& i3 v: a  }4 h•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

$ A5 @( r+ u& w. P4 L' o! s7 Khttp://www.newmaple.com/forumdisplay.php?fid=28