AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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1. Title block brief introduction
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6 R# a" y0 ?. c6 J! _2. Text height
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3. Viewport
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  {5 _- B5 Y5 H/ `* X; }4 ~8 b4. Dimensions style brief introduction
2 m( U, P8 r1 d. ~! ?! ?- d•        Tolerance in Mechanical / Autocad
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special symbols
%%D degree sign
%%P plus and minus sign
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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
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www.newmaple.com/video/autocad0007
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$ f5 X6 Q& J% r4 bA real sample to review lecture 6
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Introduction Roughness
# B2 ?6 i% }! a2 wQuick check hole size and position
Introduction O-ring groove

Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
' {& @+ Q) ?' h+ ^/ j. ^1 L•        Metric Unit: micrometer 10-6 m
  m4 j) q2 R( ^+ Y9 X4 f•        Sample 250 micro-inch = 6.3 micrometer
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•        250 micro-inch – forging surface
4 z: S7 L+ ?1 ~' c7 _. D•        125 rough machine, 32 fine machine
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Inch size O-ring
2 w$ T# L. B3 n  u0 _•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
" g3 v; f6 }; `) e•        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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http://www.newmaple.com/forumdisplay.php?fid=28