AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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2 O' p( N7 a! n+ V6 \2 Y. Twww.newmaple.com/video/autocad0006

# X- [% b" Y& f+ C1. Title block brief introduction

2. Text height

( P8 h+ Z3 r2 f8 b  h5 ]. b; i3. Viewport
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  k* Q# b# a2 |/ S0 C6 C8 r, U4 z4. Dimensions style brief introduction
1 L4 \/ c- z& P7 E•        Tolerance in Mechanical / Autocad

: ]1 O3 t  i# T$ Z8 vspecial symbols
%%D degree sign
& R4 p; ?. y; {+ t%%P plus and minus sign
% P5 O$ {  c5 l4 R0 a%%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)
0 c0 p# G% i/ s1 f" Fwww.newmaple.com/video/autocad0007
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A real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
7 l  p& k) i" {3 `( H$ e$ `$ dIntroduction O-ring groove
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Surface roughness
! j" g+ S  W" H& V+ {•        Imperial Unit: micro-inch 10-6 inch
7 {+ c" s  Z! p- L6 s2 y•        Metric Unit: micrometer 10-6 m
- _' _6 `& k+ P/ A5 x•        Sample 250 micro-inch = 6.3 micrometer
$ ^! Q' d- x: H7 u0 J+ M2 L(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
( E6 }" P( y3 G  k7 B8 }•        O-ring number 232
% E3 j/ w# z* j3 ^9 y+ a6 n•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
' d& q6 J- n8 u4 |  W. l9 K•        One of OD or ID is close standard size

% }- I  N; v4 K4 i+ \7 P* ?9 Thttp://www.newmaple.com/forumdisplay.php?fid=28