AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
2 m9 ]. N" j7 }http://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006
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0 J( t& s* G8 c1 y1. Title block brief introduction
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2. Text height

( X- L2 M/ l" J2 C& O3. Viewport
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; l) s3 ]1 Z% e: Z( x3 `4. Dimensions style brief introduction
' z; G! C5 B& t3 S4 F" d% j•        Tolerance in Mechanical / Autocad

special symbols
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%%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
! b7 Y7 i' \: c0 bNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

" N  {- m, e) S* q' V/ j! ?- g5 MA real sample to review lecture 6
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Introduction Roughness
Quick check hole size and position
Introduction O-ring groove

+ H+ z$ R& D+ l5 sSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
: F$ H" p2 C2 p•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
* P$ k9 Y" l4 r+ d- b! f1 o# A•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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Inch size O-ring
' |3 [6 N0 _0 C9 f5 J•        O-ring number 232
7 Y. F6 d( J- j- Y0 T* p•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
  B" {/ b5 k: C•        One of OD or ID is close standard size

http://www.newmaple.com/forumdisplay.php?fid=28