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
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2. Text height
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3. Viewport

4. Dimensions style brief introduction
4 C# U6 k+ a2 I- e' G( Y# G4 r•        Tolerance in Mechanical / Autocad
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special symbols
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& R8 \8 ~+ u' a1 z5 q0 O%%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)
( J+ A3 ]: q2 ^6 z6 ]% Iwww.newmaple.com/video/autocad0007
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5 m" N  k& \' LA real sample to review lecture 6

Introduction Roughness
  g+ g8 \, P* w2 j* n0 _9 kQuick check hole size and position
! ?( l4 u- Q! [Introduction O-ring groove

& C0 j3 @& \, U# w1 Z- ASurface roughness
; L. J: i. h7 G* |•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
# n' m  R/ v5 d•        125 rough machine, 32 fine machine

4 M. \8 s0 p; ?% Q- J  TInch size O-ring
& m1 f  Z- F- C: s7 S•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
1 H: v; D7 w$ d& h/ r" X9 s( @% Q•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size
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( x4 ]6 f) l9 {( {3 V& h* `http://www.newmaple.com/forumdisplay.php?fid=28