AutoCAD 实战讲座

DaShan

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

. E" ~1 f# `% P/ Q9 T6 Awww.newmaple.com/video/autocad0006

" n, m7 ?% A$ j3 c( [5 f1 w9 ?1. Title block brief introduction
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2. Text height

3. Viewport

4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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9 c* A. I5 N, ^( l. |special symbols
%%D degree sign
8 f' g; ?+ j9 c, s) }3 b%%P plus and minus sign
( y9 Q( w8 {, _%%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)
www.newmaple.com/video/autocad0007
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# M) E9 ]5 b, ]" M* m) bA real sample to review lecture 6

# U9 m# V: R% q2 G9 _( RIntroduction Roughness
' p; u2 y- o; [7 q2 iQuick check hole size and position
Introduction O-ring groove
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+ I2 j% k& z/ W! ?( {# O& [Surface roughness
" W) v: c7 D3 R% h•        Imperial Unit: micro-inch 10-6 inch
8 c" i# x9 K0 s" Z( L. c# f5 p. Q•        Metric Unit: micrometer 10-6 m
; E9 X+ M) c" Y6 t& L$ \•        Sample 250 micro-inch = 6.3 micrometer
% o5 X7 q$ p; s  q) P) f: _8 c(250X25.4X10-3)
' v8 ~+ E$ ]9 k5 F* U4 \. G•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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& \# w9 y1 _2 xInch size O-ring
•        O-ring number 232
•        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
•        One of OD or ID is close standard size

http://www.newmaple.com/forumdisplay.php?fid=28