AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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. o0 O7 q4 m" Y$ o- x- Jwww.newmaple.com/video/autocad0006

1. Title block brief introduction
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2. Text height

( b) S2 ~$ i, }: d2 n1 R3. Viewport

7 {$ J( ]" |# s1 i4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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7 ?  G% C% _4 i- yspecial symbols
%%D degree sign
# D- X: B9 v8 W0 |* N%%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)
www.newmaple.com/video/autocad0007

: h! y# @1 _4 JA real sample to review lecture 6

% C& H4 J; F3 q. L- T( N5 V; {Introduction Roughness
1 o  _9 G1 V, l0 P7 z' _0 DQuick check hole size and position
6 A) v' Q7 R, W% a  V& _2 jIntroduction O-ring groove
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Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
  H" V+ M- r/ T/ j•        Sample 250 micro-inch = 6.3 micrometer
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. F6 t  a8 T- F( d+ }: C! B% z•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

, P4 ^8 m1 K6 \9 D8 k8 KInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
( Q6 o) g7 Z! X2 s% h6 ~3 ^•        Actual size 2.734”x3.012”x0.139”
. t! y# K& B* M; C% I) o+ s: t2 O•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

9 u- H; r7 R- R& nhttp://www.newmaple.com/forumdisplay.php?fid=28