AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
4 @+ N5 h+ m9 j' J) @http://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006

1. Title block brief introduction
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2. Text height
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3. Viewport

4. Dimensions style brief introduction
% ^/ c& Z1 e+ }9 y! w9 x•        Tolerance in Mechanical / Autocad
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2 `& X/ J. v4 Z( G& Zspecial symbols
9 [$ Y+ p9 g% Y* U# g) B: D; @  G$ T%%D degree sign
2 R% Z; d$ k1 L%%P plus and minus sign
! n$ L$ k2 t: ?% D9 K0 S%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
: f( o2 G# b& OAutoCAD 实战讲座第七讲
) a6 J& H8 e4 j- Y6 y% v( b: lNew Maple AutoCAD (7)
3 Q! b) g- q3 _/ u4 U' z$ mwww.newmaple.com/video/autocad0007
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: b" S0 Y0 O, u2 C0 w2 [A real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
) S2 J( Z- g  d& R1 B6 j1 kIntroduction O-ring groove

7 c0 b/ n2 n) aSurface roughness
) L: v3 m9 A# z, O2 z0 {•        Imperial Unit: micro-inch 10-6 inch
) B7 u+ T% \/ o& @5 e•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
* A8 E$ B: @  D% g( R5 q4 s(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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" V  y1 H# y# d+ wInch size O-ring
•        O-ring number 232
' {4 c$ w" @8 ~+ x4 p2 L8 I1 d4 ?4 w0 n8 P•        nominal size 2.75”x3”x1/8”
- J. q2 J, H  O8 M•        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

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