AutoCAD 实战讲座

DaShan

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

" @0 g7 I% y, d5 S/ qwww.newmaple.com/video/autocad0006
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" x( I5 I3 J1 G+ T& e* Y6 s1. Title block brief introduction
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2. Text height

3. Viewport
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- w. `1 z0 k  p% u# u2 T$ S4. Dimensions style brief introduction
/ W2 v9 C7 A4 _  [" `' v•        Tolerance in Mechanical / Autocad

special symbols
8 B# z0 P6 S3 c%%D degree sign
% u6 Y- V$ A5 s& \' s- R%%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
% V# L. {0 Y3 u$ _% Q0 q' }4 GNew Maple AutoCAD (7)
  A- R6 t7 L5 `5 V* Cwww.newmaple.com/video/autocad0007

. |- C' H9 k/ i9 K) UA real sample to review lecture 6

7 t3 Q2 c0 d. g7 Q4 d% V* F, gIntroduction Roughness
Quick check hole size and position
  P1 \* r3 G- o8 SIntroduction O-ring groove

# Z3 L" G5 g6 j  gSurface roughness
: w( t  f8 Y, |% t3 Z•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
+ V7 N" g% d) N(250X25.4X10-3)
•        250 micro-inch – forging surface
' `/ a- Q7 U7 Q4 o1 z•        125 rough machine, 32 fine machine
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Inch size O-ring
•        O-ring number 232
•        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
1 [" N. L: s/ ^( @•        One of OD or ID is close standard size

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