AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006

' r$ z; }# k0 Y1. Title block brief introduction

2. Text height

3. Viewport
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4. Dimensions style brief introduction
1 m: h; Z9 o! h+ }•        Tolerance in Mechanical / Autocad

0 Z/ m  |+ B/ M0 fspecial symbols
%%D degree sign
( L9 a; U. p* n7 I%%P plus and minus sign
# ]/ ~3 T, \* }" E%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
7 U, n' ?5 Q3 P5 iAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
4 |7 ]3 b1 V% k7 k! bwww.newmaple.com/video/autocad0007

A real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
Introduction O-ring groove

Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
( d/ y: t4 C1 h7 m) F7 |(250X25.4X10-3)
5 b( e  p: a& r# U, j5 t( c9 {( O$ ^•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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0 e# i  b0 v0 Q. i) P: w1 @Inch size O-ring
4 O! [9 |  B9 n; N  K! v•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
' _0 Q4 G& d0 k( F+ e•        One of OD or ID is close standard size
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( u& n( j4 t# Q8 g, Ehttp://www.newmaple.com/forumdisplay.php?fid=28