AutoCAD 实战讲座

DaShan

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

7 O: t2 B0 S9 O8 X% |www.newmaple.com/video/autocad0006

1. Title block brief introduction

2. Text height

3. Viewport

# q/ T" W4 h! \5 J4. Dimensions style brief introduction
% @" ?6 m5 q9 P. u* a  \, a•        Tolerance in Mechanical / Autocad
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special symbols
%%D degree sign
& P. |* ~. k7 U  m: n0 A0 a; m# S( A9 }%%P plus and minus sign
) a& \& D7 q5 G& Z1 L%%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)
- M. p8 M9 ^0 awww.newmaple.com/video/autocad0007
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A real sample to review lecture 6

' `4 {  C& H1 v, V" Q* @' G- }1 zIntroduction Roughness
. ~  X/ i! k& }8 B5 _Quick check hole size and position
, K# E$ o' M3 y- K6 H3 zIntroduction O-ring groove
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Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
% V; z( U3 B- E  @. C•        Metric Unit: micrometer 10-6 m
# Y; v- _+ I" d8 @•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
9 p7 ]- N9 s3 p% \1 X/ E8 q•        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
+ e; \0 r( O  c•        One of OD or ID is close standard size

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