AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
1 R, y7 j# {. |) v7 A, ?* thttp://www.newmaple.com/forumdisplay.php?fid=28

/ _6 }  t2 }4 a2 a% I- lwww.newmaple.com/video/autocad0006

1. Title block brief introduction

2. Text height

) j8 `; e9 d$ N' I6 ~& ^3 o) a( X9 J( _3. Viewport

5 n6 o( |3 Z9 ^4 V: P" N: m' x3 b& r4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

0 Z6 G3 v' R0 p( z# Q9 {4 yspecial symbols
%%D degree sign
%%P plus and minus sign
' u+ E( Y7 f8 }/ y%%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
# d, i2 |! U# x: e6 ~1 y0 O, xNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

2 n: X6 |+ |' `* DA real sample to review lecture 6

+ I8 S: e! l$ bIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove
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Surface roughness
8 W# w% [) B: P•        Imperial Unit: micro-inch 10-6 inch
! ?7 P5 m/ Q+ g•        Metric Unit: micrometer 10-6 m
1 X9 \3 K% S7 E9 Y•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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; d! U* I( v* Q% R, l: }0 K  e1 TInch size O-ring
% t- g. k( V$ V•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
1 J. z- w# p) i% T•        Actual size 2.734”x3.012”x0.139”
  w. U2 z# J: @& M: E6 F' H4 X•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size
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http://www.newmaple.com/forumdisplay.php?fid=28