AutoCAD 实战讲座

DaShan

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

& Z6 q; z9 w; @www.newmaple.com/video/autocad0006
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9 c7 i- K+ G2 Q1. Title block brief introduction

0 H( `* C% y8 \1 }2 Y% `3 m4 u8 o& G2. Text height

3. Viewport

. r  g7 L& V9 ?4. Dimensions style brief introduction
8 _! J' J: |+ P/ a) T7 K•        Tolerance in Mechanical / Autocad

" k1 z6 [5 R) R% Kspecial symbols
%%D degree sign
& \* Z; L6 C8 i9 V# T1 y%%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
2 _6 |6 D/ L0 h9 HAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
9 x$ o" i# u1 f3 R9 F% Twww.newmaple.com/video/autocad0007
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& Q8 F4 _' X( y+ S! g3 ^A real sample to review lecture 6
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9 b  L* c$ N9 Y3 ~1 v1 h7 B; oIntroduction Roughness
' ^! J/ _. ~2 @  |Quick check hole size and position
Introduction O-ring groove

3 |# a# X* }% G# wSurface roughness
3 V* \2 Z1 r! C) z# Q•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
3 m9 ^! i2 R4 Z2 l3 F5 E# d4 B(250X25.4X10-3)
0 i- |7 ~6 s. P, F1 `9 `2 }, _) l; e•        250 micro-inch – forging surface
* R& a& |- @. a7 X•        125 rough machine, 32 fine machine
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& e  q( V7 d# G% C- N8 `2 V; yInch size O-ring
+ [( F, }9 W& ?/ X( y•        O-ring number 232
3 V, `( o" M) a3 p0 E8 U•        nominal size 2.75”x3”x1/8”
' s. S3 U1 G6 Q( X$ n•        Actual size 2.734”x3.012”x0.139”
' d* X5 a; {) m) w# o% D+ I% S' [•        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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* Q, n3 b" `3 `9 |# Y: F3 q; Yhttp://www.newmaple.com/forumdisplay.php?fid=28