AutoCAD 实战讲座

DaShan

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

0 D: h8 ]3 f' \& ]0 K( l' C. mwww.newmaple.com/video/autocad0006
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7 ]1 Z0 M, y5 A1. Title block brief introduction
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2. Text height

3. Viewport
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4. Dimensions style brief introduction
0 A% A  _& b# d7 t•        Tolerance in Mechanical / Autocad

% n4 S; x- Y1 R/ A1 @; F9 |special symbols
%%D degree sign
%%P plus and minus sign
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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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' Y: P/ \" y0 R+ M+ y. U: VA real sample to review lecture 6
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Introduction Roughness
8 X  W' H& U$ X- _Quick check hole size and position
Introduction O-ring groove
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Surface roughness
1 i& H" E9 x  T: I, k•        Imperial Unit: micro-inch 10-6 inch
0 l$ m5 y6 X: G9 H& F•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
% z7 _' ?$ c( ?7 M(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

) N- q! N  _2 X9 B& L# u* @8 vInch size O-ring
•        O-ring number 232
+ j1 ]; ~) p) k! N6 [) P* B•        nominal size 2.75”x3”x1/8”
6 ]' x/ q: r- n5 P9 `4 j; G•        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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