AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
' R0 s; w) T& p7 ]' t
% b, @7 |  R& Cwww.newmaple.com/video/autocad0006

1. Title block brief introduction

2. Text height

) U7 a+ J8 |9 c, B. l, {3. Viewport
) K' q$ `* V5 H
4. Dimensions style brief introduction
1 }3 j. O. q/ s( ^$ Z•        Tolerance in Mechanical / Autocad
& j, _8 Z5 G8 _) U$ N- C3 ?
special symbols
%%D degree sign
%%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 f' x1 Z) k! W1 s/ y" BNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
3 x, f! _( B+ Q: \* l+ Y  s5 c/ d
& f- o% S9 ?% h. ]1 T. bA real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
Introduction O-ring groove
2 b  }/ F, V' O4 k- s
( `% u+ \: g" A$ ~8 k- wSurface roughness
1 M) \& }5 s! h1 P% Z7 G7 W. I# l•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
0 k0 j; c9 R. U9 @" N0 B, N" _•        Sample 250 micro-inch = 6.3 micrometer
' _# S4 `5 K+ O(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
•        O-ring number 232
4 Q. Q6 s- [' Q5 \•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
' i7 Z& I5 b# F•        One of OD or ID is close standard size

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