AutoCAD 实战讲座

DaShan

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

& ]: T$ D0 e1 ~  `7 Awww.newmaple.com/video/autocad0006

1. Title block brief introduction
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2. Text height

8 i6 h; A9 k+ G; @3. Viewport

: U' E# \3 f6 z! y4. Dimensions style brief introduction
0 Y4 P- N2 _# d•        Tolerance in Mechanical / Autocad
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$ s* n7 R/ m+ a$ h3 Xspecial symbols
%%D degree sign
1 s* u5 h  K" y6 S%%P plus and minus sign
%%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)
: {: w) G& Q; \0 X% Q) ]) Gwww.newmaple.com/video/autocad0007
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A real sample to review lecture 6
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Introduction Roughness
4 N7 b% D2 a' e2 S- e. T0 g! oQuick check hole size and position
Introduction O-ring groove

" G, I  J: x* [! k& C& r" RSurface roughness
$ L3 E, V" l: }. X' f•        Imperial Unit: micro-inch 10-6 inch
! Q$ a' L4 @1 q) V) M: ]•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
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; g+ [6 h& @3 G: Y; q* `•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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+ I: i- ~% r. o3 x/ ~" b, `Inch size O-ring
" r7 {* D/ _* z. [2 F% t! c1 ?•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
# m2 y; p+ f1 c" M9 r•        Actual size 2.734”x3.012”x0.139”
$ E& }' I9 @' K•        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