AutoCAD 实战讲座

DaShan

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

% j" ^! j' r2 k7 nwww.newmaple.com/video/autocad0006
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1. Title block brief introduction
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. }# R0 Y6 ]! q6 X) W) g2. Text height
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( W8 ^9 O: r- {3. Viewport
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4. Dimensions style brief introduction
) O' F& |5 a4 ?* S( Y•        Tolerance in Mechanical / Autocad

special symbols
%%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
AutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

A real sample to review lecture 6
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! H, ]& ^  x9 M$ `Introduction Roughness
Quick check hole size and position
Introduction O-ring groove

Surface roughness
6 K- @" Y- L3 ^1 @9 |! p4 V1 N/ `•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
9 L/ K& N% z3 j•        Sample 250 micro-inch = 6.3 micrometer
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! J( Z+ u+ i8 r- w* v, L; e•        250 micro-inch – forging surface
" b- X! H8 T! |6 E' ?2 }$ P% T, U•        125 rough machine, 32 fine machine

Inch size O-ring
' }6 i# n1 ?4 g& u, @•        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
•        One of OD or ID is close standard size

2 a  n) w; r6 ?/ e, Ehttp://www.newmaple.com/forumdisplay.php?fid=28