AutoCAD 实战讲座

DaShan

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

www.newmaple.com/video/autocad0006
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1. Title block brief introduction

! s3 M, r8 }. O" q$ [, @4 U2. Text height
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3. Viewport

4. Dimensions style brief introduction
* e" r' o4 h. ~•        Tolerance in Mechanical / Autocad
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0 L+ l* w! |5 O/ ?$ C" Cspecial symbols
! l6 H" c- v* E5 }3 E( I7 x%%D degree sign
%%P plus and minus sign
+ G5 v. Y2 E# m%%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)
% n% d+ S* r9 E; Qwww.newmaple.com/video/autocad0007
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8 K! C9 S" ^6 q7 M+ K/ o& uA real sample to review lecture 6

Introduction Roughness
; _! J) l2 c1 }* C" O$ y5 I1 vQuick check hole size and position
Introduction O-ring groove
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0 B. V4 I( T6 d1 ^, sSurface roughness
: P$ S; Y/ p6 _2 S•        Imperial Unit: micro-inch 10-6 inch
7 _- ]2 W0 N/ q•        Metric Unit: micrometer 10-6 m
% e% A3 Q$ u: Q/ x0 p& n: m* r•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
" F# a) L3 @; H, K# h•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
5 g" O% J' F- y•        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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! t% \9 T7 H; L1 M( Bhttp://www.newmaple.com/forumdisplay.php?fid=28