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
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& l, }1 V* T1 @% L9 C% ~4 u1. Title block brief introduction

2. Text height

* x$ R2 i/ p( _6 O3. Viewport
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4. Dimensions style brief introduction
. Z% u/ J; }( l+ u8 ~2 q; `6 S•        Tolerance in Mechanical / Autocad
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special symbols
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%%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
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A real sample to review lecture 6

. \+ w6 s& D, `" [5 r1 GIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove

4 }/ A2 a, d/ \$ Q# s& f5 MSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
% J3 u* z3 ^9 {6 ]# v, e•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
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9 a. j1 |' D" C! {# `8 G5 C•        250 micro-inch – forging surface
! l+ o/ L0 U( C8 y•        125 rough machine, 32 fine machine
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1 J$ }6 K! {. U2 U( f& L7 UInch size O-ring
•        O-ring number 232
% `$ y$ J3 _7 Y0 o" d4 o4 E# l•        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
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6 J' b, R, s) R" Ehttp://www.newmaple.com/forumdisplay.php?fid=28