AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
: s  B8 Z' B4 `: Q# H  U4 t0 ^1 Dhttp://www.newmaple.com/forumdisplay.php?fid=28

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1. Title block brief introduction
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2. Text height
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3. Viewport

3 `1 [1 c. ^9 r! z7 L4. Dimensions style brief introduction
, x  W. W* V9 z% ^  T% d•        Tolerance in Mechanical / Autocad

special symbols
%%D degree sign
%%P plus and minus sign
7 h" r2 f% n6 `  ?1 j. ~%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
  r+ g* O% ?  R/ e4 D$ rAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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A real sample to review lecture 6
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+ f2 v/ }) t$ Z/ y  QIntroduction Roughness
Quick check hole size and position
( I. `7 n! K8 b5 z( p5 @! }Introduction O-ring groove

Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
# ~, j% h3 I5 f5 K+ W3 L( S•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
' v( o/ N) l9 A& j" R& y•        250 micro-inch – forging surface
) \1 C$ e1 k  K& k•        125 rough machine, 32 fine machine
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& `/ C% p9 l, C( V4 \" E8 _  pInch size O-ring
( H0 G: |! u2 Y( Y( X( ~, X0 D•        O-ring number 232
' f- x$ U5 V( k' w6 H•        nominal size 2.75”x3”x1/8”
, z( a: s$ ^0 t( y3 h% h5 n" z•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
8 F- R' S' m) j; F3 B* N- \•        One of OD or ID is close standard size
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http://www.newmaple.com/forumdisplay.php?fid=28