AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
# \' p9 T  S( F% `7 ^$ m$ ]
www.newmaple.com/video/autocad0006
* |, s) @$ F  X
1 O1 ~1 g0 R' u1. Title block brief introduction
( c" u3 n+ Q. |9 z+ [, a
2. Text height
0 \3 b# W# q6 u$ B& _4 `# b
) e* J7 t* i2 u% d3. Viewport

3 R( d. E; X$ E! s4. Dimensions style brief introduction
7 |' G8 a9 N7 e5 V) M0 t+ H•        Tolerance in Mechanical / Autocad

special symbols
3 ]9 }# Z: i. g%%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
7 }1 _- Y$ \  _" A1 L+ A2 I6 U4 X5 m7 \New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

A real sample to review lecture 6
1 M  H, i4 }8 o% ~4 `/ X2 x$ T
) c' ^% |8 L+ r. U; I7 m* b+ {Introduction Roughness
Quick check hole size and position
Introduction O-ring groove
, p  A- o3 k% M- b
Surface roughness
$ u- y& A6 w4 _# x•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
% R) z# L4 A7 n+ q! f3 L# m•        Sample 250 micro-inch = 6.3 micrometer
8 j9 I0 D9 A" S- e% W% \4 m(250X25.4X10-3)
•        250 micro-inch – forging surface
2 _, v5 H: w3 Y4 D4 ?' S•        125 rough machine, 32 fine machine
4 J* |! y! a& l9 @9 K
Inch size O-ring
•        O-ring number 232
* D, E$ E9 X7 h. q. E, q( ^, t•        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
•        One of OD or ID is close standard size
4 k; K3 a: F0 |; w: F
http://www.newmaple.com/forumdisplay.php?fid=28