AutoCAD 实战讲座

DaShan

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

www.newmaple.com/video/autocad0006

1. Title block brief introduction

2. Text height
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, z' Z: R# M1 _0 V- s) g3. Viewport

4. Dimensions style brief introduction
$ O6 q) q: |+ g- g- }•        Tolerance in Mechanical / Autocad
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! }: T. ^3 M. j$ vspecial symbols
3 \, ~# n- m4 d%%D degree sign
. I& f' y# ~! b6 I# d5 V6 |%%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
6 o- M5 C6 M; f' lAutoCAD 实战讲座第七讲
3 c- V& \! C- X6 R$ N, J  TNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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A real sample to review lecture 6
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# A  |( p+ B) D1 O; _& {Introduction Roughness
4 O; L/ [( j" H! K1 e* ^Quick check hole size and position
9 V' ?5 M5 }0 z- x  h5 x  `. Y  _Introduction O-ring groove
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! x: u* R: I" tSurface roughness
' R, B( J+ Q" ?6 {) V8 m•        Imperial Unit: micro-inch 10-6 inch
7 {: ?  j8 v/ k; S' ~9 g•        Metric Unit: micrometer 10-6 m
/ x- u9 d( c3 ?; U9 }•        Sample 250 micro-inch = 6.3 micrometer
3 N4 @8 s; P5 [3 n: E(250X25.4X10-3)
8 S8 ~/ Y# T9 N+ l0 x•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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6 w% s5 ?1 S5 l2 fInch size O-ring
- m+ q7 p  u6 C4 ~  {) o7 J•        O-ring number 232
9 A  Z5 S( F' r9 g5 k•        nominal size 2.75”x3”x1/8”
0 v, b; ?; a5 L0 G+ ^•        Actual size 2.734”x3.012”x0.139”
* K) d: t' d& f& f' h•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
- Z* R% G% T4 F# r•        One of OD or ID is close standard size

7 q0 ~5 Q7 i+ V5 N9 w% G" Yhttp://www.newmaple.com/forumdisplay.php?fid=28