AutoCAD 实战讲座

DaShan

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

www.newmaple.com/video/autocad0006
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1. Title block brief introduction
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3 v! n/ _: s( u  G4 u8 e2. Text height
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( ^, k5 t8 m8 N7 Q( q4 U* o( a3. Viewport
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" d& H" X/ X3 P* V/ O+ y* y4. Dimensions style brief introduction
4 [& r% \) [# L$ g5 ]# [•        Tolerance in Mechanical / Autocad

9 L9 W+ L  g& }4 J' W8 e' W4 Zspecial symbols
%%D degree sign
* E3 k$ N) L. f3 ^1 F%%P plus and minus sign
2 y: |: N9 F: X2 Z0 E1 I; n. D" Y%%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)
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A real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
* K6 a" T5 b' B6 p  V- u4 hIntroduction O-ring groove

- v/ o  V9 o, ~- Y4 fSurface roughness
3 G. b! O/ _) b) Z5 o1 J3 q•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
" P1 J( }0 c$ E0 x' ?5 {0 t6 N•        250 micro-inch – forging surface
6 M6 a, f* l+ M# `. w' \•        125 rough machine, 32 fine machine

Inch size O-ring
. b1 A0 u4 o8 f: r! A3 H" f- T•        O-ring number 232
, g' H  X/ [  T•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
3 G; e  _8 a& Z" {, d4 Z! l& r•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
8 d4 p% a7 N% m•        One of OD or ID is close standard size
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http://www.newmaple.com/forumdisplay.php?fid=28