AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
( p( L5 P0 \9 bhttp://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006

7 R% `4 b' Q; z% v4 }1. Title block brief introduction

# b& u# V4 n- o- s2. Text height

3. Viewport

4 ~/ q* [4 J- T% e$ I$ P/ U" Y4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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" T) _7 G1 a0 E7 i6 lspecial symbols
% i/ Q) H6 D5 \6 x%%D degree sign
3 ]5 s' ?# \% J( p%%P plus and minus sign
5 ]0 k+ w* B3 s%%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
New Maple AutoCAD (7)
( G/ p7 u# C% i5 `www.newmaple.com/video/autocad0007
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2 q" M( m! y, j$ g8 U/ U% bA real sample to review lecture 6
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% K0 Z2 f! a+ M, ?/ dIntroduction Roughness
  U7 i" [) M) X& N9 UQuick check hole size and position
Introduction O-ring groove
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& K; d+ P/ J0 `0 l7 e* f! M3 dSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
( \2 @( d9 z; N! T0 P5 c% ]" K•        Metric Unit: micrometer 10-6 m
3 {3 M$ ^* Z1 v•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
; Z4 }0 m) L$ T+ Q$ i8 h•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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$ F9 I! v1 a; q5 W4 BInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
0 Z# w3 E( M" n* {* d! N( ?' T•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
$ m  _  Z! M7 _9 i9 E# m' R•        One of OD or ID is close standard size

6 r9 f0 K& e* w7 H3 k& Dhttp://www.newmaple.com/forumdisplay.php?fid=28