AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006

0 ^' ?8 E' o9 L; W- L/ `1. Title block brief introduction
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2. Text height
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# g- E- q+ y. T, `+ l; ]3. Viewport
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4. Dimensions style brief introduction
8 U) r$ o6 ~8 a1 i•        Tolerance in Mechanical / Autocad

special symbols
5 P. v- e8 ]9 ?' w  G%%D degree sign
%%P plus and minus sign
! w% t. p- L9 z! S  G9 k! H6 J% ~: a%%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)
www.newmaple.com/video/autocad0007
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A real sample to review lecture 6
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7 \; X2 M6 M( T) b7 E$ gIntroduction Roughness
" ^1 t4 l1 X; ^7 k  KQuick check hole size and position
8 E- n0 X( v% Y2 V. V- bIntroduction O-ring groove
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; G' E: n- ~# oSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
! Q% {; M% ~. R( W  A8 A•        Metric Unit: micrometer 10-6 m
( w! O1 n$ g: ^•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
+ P0 m9 b9 @4 g+ y3 @. V, S•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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Inch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
( U$ N. A8 r' g, o! A6 t; y•        Actual size 2.734”x3.012”x0.139”
4 ~6 g9 K, B2 \" V0 Q5 y  P' A- Q•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
# \3 [" c5 Z* u9 \1 \7 l: r  ^7 z•        One of OD or ID is close standard size

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