AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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+ ]  ]7 r9 j/ uwww.newmaple.com/video/autocad0006

1 ^; ~4 l" [" t. E0 ]1. Title block brief introduction
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7 O* |- U# j; `  k2. Text height

3. Viewport

, N) C5 u7 ^8 o4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

8 q7 i8 g, A$ X4 g9 S2 C; ?special symbols
%%D degree sign
%%P plus and minus sign
3 U# A3 [  F' `! M6 e%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
2 O6 x0 n, c7 c$ i# ]* h# AAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

A real sample to review lecture 6
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" @* H1 }, n' ]1 D/ p8 E( _Introduction Roughness
# M# Z) D7 r5 p+ _- Z6 m* mQuick check hole size and position
Introduction O-ring groove

$ N/ U) x, N- g: [: }% kSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
" y+ M. Z, i  }( B& G$ o7 @•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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Inch size O-ring
) M2 ~6 ]  T5 d) W: H$ H•        O-ring number 232
/ [5 e3 Y$ I; x; }* N8 v0 |•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
1 [, O- |* N  z•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
1 R$ [- s: ]: E2 N•        One of OD or ID is close standard size
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! F( G% P. X4 q. M/ U) y  Uhttp://www.newmaple.com/forumdisplay.php?fid=28