AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
# _: e3 C, O  z; fhttp://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006

1. Title block brief introduction
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2. Text height

! q+ N4 _3 M/ y+ |3. Viewport
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$ P9 o% W9 d6 @# x% L8 w1 m4. Dimensions style brief introduction
2 H6 n& m/ O5 q; ?9 j•        Tolerance in Mechanical / Autocad

special symbols
%%D degree sign
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" M2 v! N4 S9 l2 }! X& M%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
9 A) ]9 a7 _+ X9 {5 g  E$ A) V. YAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
- O' Y9 T$ I! F+ Nwww.newmaple.com/video/autocad0007

A real sample to review lecture 6
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; J+ ~3 Y, J1 ~Introduction Roughness
3 u3 a5 q) ]0 H! y) c1 k) oQuick check hole size and position
3 Q5 H" J; R. _! h" g4 |Introduction O-ring groove
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Surface roughness
0 @# e% ?+ Y0 w; Y•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
# A( _6 R0 Z1 [& @9 ^•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
8 P3 a% S, F& _# a+ B: [•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
•        O-ring number 232
' T. R1 ^2 ~; Z* G  P  ?% H•        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

5 B- i. g+ d4 E$ e" Lhttp://www.newmaple.com/forumdisplay.php?fid=28