AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
" D: ^. G5 }# W, V! g5 Rhttp://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006

2 T4 l5 f6 d! ?( L- b4 k1. Title block brief introduction
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2. Text height

3. Viewport

- {1 q7 S  d; R# e" |4 J, l4. Dimensions style brief introduction
3 V" z. s! \& `8 S•        Tolerance in Mechanical / Autocad
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special symbols
3 _4 S& t6 J: G3 i) N) l  J%%D degree sign
7 j8 O8 ?+ p* h  A6 r( t$ x4 j& w%%P plus and minus sign
9 q1 u' A# c- e%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
3 m7 v! e6 }! z7 }6 r- mAutoCAD 实战讲座第七讲
+ R$ B: |3 C# D7 b% {New Maple AutoCAD (7)
  V) t# A* e' y/ m# m: t$ fwww.newmaple.com/video/autocad0007

A real sample to review lecture 6
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) ]( `/ A! p0 q6 \9 nIntroduction Roughness
Quick check hole size and position
5 R; v& D2 T) E) S$ H8 }+ SIntroduction O-ring groove

+ N. u' h$ K, GSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

9 H7 i" ?$ G0 k1 w2 V9 LInch size O-ring
•        O-ring number 232
; l- O8 l  D% V2 v•        nominal size 2.75”x3”x1/8”
4 V  n' Q# |( [& h* S5 ~3 f•        Actual size 2.734”x3.012”x0.139”
+ O/ y+ B4 B2 ~•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

% o" _' a+ q; Y- X5 K$ C1 Ghttp://www.newmaple.com/forumdisplay.php?fid=28