AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
7 e- h8 [. L6 a* t6 Hhttp://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006
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) [- ?0 o* C6 C1 b3 H1. Title block brief introduction
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9 h/ z* l+ d0 b, O' {+ r5 m% K+ J2. Text height

3. Viewport
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4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

0 l6 _6 s9 w4 v. Ospecial symbols
( x8 Y# a  Q% g4 X%%D degree sign
%%P plus and minus sign
5 ?/ H& M6 f: D0 X8 Q%%C diameter symbol

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)
4 R7 J1 k: V& J. d: G7 @www.newmaple.com/video/autocad0007

A real sample to review lecture 6
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3 }( j9 t9 D* \9 d( t/ R" ]Introduction Roughness
! z$ [8 y' b4 |6 r9 c8 J* {, OQuick check hole size and position
, `6 z% r! R( n& S8 T7 pIntroduction O-ring groove

Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
& S  ~$ D  M1 R+ f6 P# E! U•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
; l) V  K% `, ^6 f( y. B•        125 rough machine, 32 fine machine
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! c( y% j& m# f5 i& OInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
) _5 Q+ ?* d# g4 Q4 T" B•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

http://www.newmaple.com/forumdisplay.php?fid=28