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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7 @+ R/ ]! _( J# W. C3 K& s1. Title block brief introduction
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8 H6 K7 o( D# n9 ^9 @$ `. u2. Text height

3. Viewport

( u7 G* K+ W/ P3 g+ |# c4. Dimensions style brief introduction
% U9 }( ~& s2 Q$ s+ q, Q•        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
3 e# R, w$ V6 {6 D* s% `% v9 TNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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A real sample to review lecture 6
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3 ^  v7 o+ p8 L7 g1 Y) e/ EIntroduction Roughness
Quick check hole size and position
9 U- _" k  o; e2 P$ L! TIntroduction O-ring groove

% k( X4 A/ W" P7 M* LSurface roughness
1 |" a$ g; e$ n) B4 e' ^•        Imperial Unit: micro-inch 10-6 inch
( d. l- [$ i( T•        Metric Unit: micrometer 10-6 m
! I; _8 m. B: M2 l) h, w$ W•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
, x  I/ a+ [* H7 T6 @•        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”
•        Actual size 2.734”x3.012”x0.139”
- w, L3 t; H+ E- S2 s3 `# ^& w•        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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7 T3 h/ P9 K9 phttp://www.newmaple.com/forumdisplay.php?fid=28