AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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- e  s& V, \4 R* w' n3 U# Wwww.newmaple.com/video/autocad0006
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1. Title block brief introduction
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2. Text height

6 p9 Q% O3 t5 c+ U; k7 v, M' ^# e* y3. Viewport
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4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

special symbols
# l9 y; T; i* Y%%D degree sign
1 Q2 T+ B% o. ~/ D0 j+ e; B/ ]%%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
New Maple AutoCAD (7)
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A real sample to review lecture 6

' }) @% N" e5 L% HIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove

4 z! m2 Y5 f  g. jSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
" f2 d7 y: c0 ]& ^8 k6 v•        Sample 250 micro-inch = 6.3 micrometer
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•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
, \9 J# r+ t4 _5 _! w•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
) e& A: y9 K3 `/ Z•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
- w* O. C5 i" z! _•        One of OD or ID is close standard size
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( B! t0 B' c7 T! c2 qhttp://www.newmaple.com/forumdisplay.php?fid=28