AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
9 j7 Q) |( A& `. E( @! w% Khttp://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006
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( c7 N: i* |; S2 e& C& J3 r2 v1. Title block brief introduction
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2. Text height
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3. Viewport

- d, I9 K5 c' p; {( \. e) M4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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# I) R( o* P. I  I8 cspecial symbols
" V/ X/ R8 ^; w9 D%%D degree sign
5 k7 Q6 B0 x8 m' A. d%%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
6 v5 U" O7 a9 w1 pNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

' Z) T. d# @7 H* _0 c) N0 TA real sample to review lecture 6
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7 t( x" j- e! d: E& gIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove
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* Q4 p- T. Q1 y7 Z) F: I1 `Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
$ E+ x& j$ C) |5 k! f* o" A" P& E•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
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•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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7 C8 E/ n8 w# |3 m6 D: sInch size O-ring
% I: P! N% X0 \  P7 R•        O-ring number 232
' X3 i8 d7 Y+ W) Q3 ^•        nominal size 2.75”x3”x1/8”
+ `7 ?/ h3 |0 ~9 h/ n) a•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
% u7 ?" b5 [) Z# x8 \/ p5 L•        One of OD or ID is close standard size

http://www.newmaple.com/forumdisplay.php?fid=28