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

2. Text height

3. Viewport
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- U$ [0 o' R# l" X4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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special symbols
%%D degree sign
: W. o6 H+ m" f2 G3 X! i% L%%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
* g4 ~  F. I, nAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
  F8 \% q  n: z+ awww.newmaple.com/video/autocad0007

8 l0 q: S3 D' HA real sample to review lecture 6
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Introduction Roughness
Quick check hole size and position
8 H  N5 l( p" \* qIntroduction O-ring groove
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. H+ H& K5 K) t5 ZSurface roughness
, P! p2 B( Z( A: J8 S1 d+ b, p•        Imperial Unit: micro-inch 10-6 inch
, V( U& X3 U* Q2 U/ n9 C' K•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
# t; s2 c8 f2 O6 T6 j# u(250X25.4X10-3)
+ I% q  `1 E1 p' }  x7 `( F: x! d•        250 micro-inch – forging surface
; A7 ]( I5 s9 M0 I. p•        125 rough machine, 32 fine machine

/ o# n" [% A& G8 D  _/ KInch size O-ring
•        O-ring number 232
6 N, ]+ y. L* @' U2 U/ F•        nominal size 2.75”x3”x1/8”
. R& B; d; b3 F  v1 t•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
: W7 o8 z4 b- v: Q& v•        One of OD or ID is close standard size
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2 Z! t" V4 R& Ghttp://www.newmaple.com/forumdisplay.php?fid=28