AutoCAD 实战讲座

DaShan

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

& D/ d6 N8 y! H# jwww.newmaple.com/video/autocad0006

1. Title block brief introduction
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2. Text height
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3. Viewport
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4. Dimensions style brief introduction
7 S! }& g3 j4 r( w4 _5 n% d! i•        Tolerance in Mechanical / Autocad
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special symbols
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%%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)
www.newmaple.com/video/autocad0007

* Z& L  G( K+ [. J4 f, j3 dA real sample to review lecture 6
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% |2 X: d. j7 b+ b" s% AIntroduction Roughness
Quick check hole size and position
) K) ?8 e* {8 M+ I1 [/ xIntroduction O-ring groove

% C4 D0 k7 Y* T/ ]1 hSurface roughness
1 ^9 K; }8 R8 u8 l  x- a4 t8 Q•        Imperial Unit: micro-inch 10-6 inch
4 D7 J( q) M4 s  z  X•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
, @4 h' P3 N9 S3 d# r: l(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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! G$ {: H) R$ q! ^' C& ?: _3 SInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
1 _  K  k' \- G6 C•        Actual size 2.734”x3.012”x0.139”
2 b) r' ^9 g5 Y0 a•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

" l' i/ }- O" W+ E# P8 K! P: Yhttp://www.newmaple.com/forumdisplay.php?fid=28