AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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$ f7 R) W( w. A* _# r$ p% g6 Xwww.newmaple.com/video/autocad0006
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& e3 \: o: U# H1. Title block brief introduction
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2. Text height
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3. Viewport
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4. Dimensions style brief introduction
- ]) {( m9 p3 d6 Q2 W+ q4 P/ @•        Tolerance in Mechanical / Autocad
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special symbols
%%D degree sign
%%P plus and minus sign
6 Y0 n& \- o1 _' n! s) z%%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)
# w2 z; {4 H; L+ T/ x& }www.newmaple.com/video/autocad0007

A real sample to review lecture 6
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Introduction Roughness
. l: w# F: z6 {  wQuick check hole size and position
Introduction O-ring groove

Surface roughness
( m) x; j1 K4 v# D5 X" W•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
3 V5 y0 h: H, _& _/ B•        Sample 250 micro-inch = 6.3 micrometer
( _5 u5 ~2 E: x, A(250X25.4X10-3)
! S$ K; r0 W9 T( Z7 \  h; K•        250 micro-inch – forging surface
- y' H+ j, n& s$ c. w5 f•        125 rough machine, 32 fine machine

5 i8 I" ]9 ?$ BInch size O-ring
# e& R; I. a4 m+ ]•        O-ring number 232
; v4 T3 M! p6 Z. m% r•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
/ R$ ]2 r6 m4 d' H; H. l•        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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http://www.newmaple.com/forumdisplay.php?fid=28