AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006

1. Title block brief introduction
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2. Text height

3. Viewport

4. Dimensions style brief introduction
; b7 J$ l' a0 L4 d% u: E2 X•        Tolerance in Mechanical / Autocad

special symbols
% R8 S% t9 m/ T%%D degree sign
%%P plus and minus sign
" J9 O; M& {) e1 O+ x6 @) D%%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
) `$ T/ E1 E; h: oNew Maple AutoCAD (7)
8 O8 q& o$ P9 U& t& @8 T+ Y) s/ ]7 ^0 uwww.newmaple.com/video/autocad0007
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A real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
Introduction O-ring groove

Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
0 z! u  h, }3 i2 _; Q& |0 s(250X25.4X10-3)
% p) ?$ H' g7 _+ E, b•        250 micro-inch – forging surface
. e0 @( [/ [. G" R4 a# ^$ \. L•        125 rough machine, 32 fine machine

6 g* S; t; {  j% |! c: ZInch size O-ring
& {9 M- M8 J7 l4 }2 M5 E•        O-ring number 232
! _- ]5 e5 @# d•        nominal size 2.75”x3”x1/8”
( O6 ]0 o  j( w" C•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
  Y3 D9 h, m% i. x7 \•        One of OD or ID is close standard size
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http://www.newmaple.com/forumdisplay.php?fid=28