AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
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www.newmaple.com/video/autocad0006
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' P1 }5 a7 T0 r3 L, f& F0 f% [7 ~1. Title block brief introduction
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. s" c5 Q  f7 d; m1 Q1 I2. Text height
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3. Viewport

. P5 K' t7 d) }/ v- S2 e4. Dimensions style brief introduction
  Z+ U% k5 }* J/ l) J•        Tolerance in Mechanical / Autocad
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5 E. E. l0 E( @special symbols
5 O" a! g3 w" \2 ?% @%%D degree sign
%%P plus and minus sign
%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
/ T: O* E0 h5 l) A  T6 fAutoCAD 实战讲座第七讲
5 |) K# ^4 `+ {: W4 V; X2 X% UNew Maple AutoCAD (7)
$ O# K& \' L; f, Gwww.newmaple.com/video/autocad0007

' \4 l3 V# b7 Z5 [0 rA real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
+ J- c) P5 l& V, D8 m) G6 TIntroduction O-ring groove
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Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
1 U$ J% Q$ B7 r/ F+ v( ^•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
5 T" X% P9 w! [•        125 rough machine, 32 fine machine
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Inch size O-ring
2 K, {9 ]3 F7 }) b/ G! Z" W3 @2 q9 n•        O-ring number 232
/ K* A4 `& ~4 K3 [•        nominal size 2.75”x3”x1/8”
  o& k1 C+ Q7 O; x2 s•        Actual size 2.734”x3.012”x0.139”
: Z% P) x- r) s•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
/ H% e4 z6 j% O•        One of OD or ID is close standard size

" k: ]9 ?# g1 m  Q* l+ U7 fhttp://www.newmaple.com/forumdisplay.php?fid=28