AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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4 G8 ?  l( ~- l+ Y6 D( z5 Gwww.newmaple.com/video/autocad0006
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/ Y3 M' v9 l$ l1. Title block brief introduction
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2. Text height
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9 w3 q8 ?$ k! |, e3. Viewport
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4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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special symbols
8 B6 w$ X4 h* Y- c9 P  v%%D degree sign
%%P plus and minus sign
, C! f' A& x; i3 _%%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
% H: {# W' I, h* j) _3 g/ fNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

A real sample to review lecture 6

" M$ ^. K% r$ YIntroduction Roughness
Quick check hole size and position
% n5 Z" V! u& l2 H  N% XIntroduction O-ring groove
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Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
% L) C; D& a* {) B; c( @•        Sample 250 micro-inch = 6.3 micrometer
# A1 C; G% @5 a$ Q) \3 ^8 B(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

8 H) D* j1 S! M! I- F; OInch size O-ring
•        O-ring number 232
" O4 g5 y& @0 W; c( d•        nominal size 2.75”x3”x1/8”
* ^6 m6 A( S0 V: R; T•        Actual size 2.734”x3.012”x0.139”
0 j0 a+ o- {% f( o  k•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
6 R8 ]- l. E- N) B. X•        One of OD or ID is close standard size

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