AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
1 ?' n. ]7 n$ O6 lhttp://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006
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1. Title block brief introduction

2. Text height

3. Viewport

4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

) \, |6 f  \& i* R, ]special symbols
%%D degree sign
%%P plus and minus sign
) h( A: A! ^9 f* ]1 j" p5 }%%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
$ x/ {5 j& b" Z! C7 [. _9 ^* eNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

A real sample to review lecture 6

4 O4 ?' F- h  ~; \' PIntroduction Roughness
Quick check hole size and position
: h5 ~7 ]- ~! l# W8 pIntroduction O-ring groove
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) m) b3 q* W  _, ~( G, {5 \* U/ nSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
7 u- f; s( [# D3 p; t7 L•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
4 W, u0 k7 g$ g•        250 micro-inch – forging surface
& R2 g0 q/ n) R/ ^' q2 X2 W•        125 rough machine, 32 fine machine
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9 J! r" ]. c5 k: L- LInch size O-ring
& X' f* {) a! T' Q! e% H•        O-ring number 232
7 @, e$ f5 y6 z& M% V- |1 V•        nominal size 2.75”x3”x1/8”
6 d$ |1 B* ~- M9 [3 V1 r5 b•        Actual size 2.734”x3.012”x0.139”
1 Z" W0 S' s; K9 O  d3 U6 S•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
, `7 X+ m. Z: b) F. I•        One of OD or ID is close standard size

' |& F8 n# o  }/ hhttp://www.newmaple.com/forumdisplay.php?fid=28