AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
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+ B8 i1 r+ u+ m: {www.newmaple.com/video/autocad0006
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5 @3 m4 K3 m% G8 J# a1. Title block brief introduction
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5 p& s, D2 b* [: p3 p$ H1 M2. Text height
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8 I9 I) J3 h  m% G. h( n0 F! O+ m3. Viewport
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, e% {9 A" g3 {4. Dimensions style brief introduction
  ?3 V, U# Y9 _- g•        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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Introduction Roughness
& n& U3 R4 t6 IQuick check hole size and position
0 S* R+ ^3 V3 Z0 e  G& z+ RIntroduction O-ring groove
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+ B( ?" c/ F' r; vSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
% _# k' f: s, I4 c2 i& i% E" k$ \•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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; z! E' E' |( ]Inch size O-ring
  x$ Y0 p# a7 C/ M1 Y2 C0 n: h. B•        O-ring number 232
1 M! T' ^& N+ {3 _( |7 l7 B7 B•        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
; {9 [( E. [. L% h' E1 T5 n•        One of OD or ID is close standard size
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http://www.newmaple.com/forumdisplay.php?fid=28