AutoCAD 实战讲座

DaShan

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

+ u, s$ H" k9 i% j  Q5 X) Uwww.newmaple.com/video/autocad0006

( E( R( L( t3 T2 C1 i4 U% N1. Title block brief introduction
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; D+ }- |% T, M2. Text height

3. Viewport

4. Dimensions style brief introduction
; _4 Y$ t- [5 r& f% H2 k" w- e4 L•        Tolerance in Mechanical / Autocad
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special symbols
%%D degree sign
%%P plus and minus sign
  C: u" T6 |- L( y4 T%%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)
# z' |* T: q) G( v2 Z/ d$ Q) nwww.newmaple.com/video/autocad0007
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! R3 A$ Q: l. J0 yA real sample to review lecture 6

Introduction Roughness
; V% a( }+ ]- DQuick check hole size and position
' l$ R) v# p6 y( O! e( PIntroduction O-ring groove
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Surface roughness
4 y- Y, \- ?" j•        Imperial Unit: micro-inch 10-6 inch
/ b# U. e4 b# a. o7 U) a/ t. }0 }•        Metric Unit: micrometer 10-6 m
6 U; t$ D- Z; A& \7 T•        Sample 250 micro-inch = 6.3 micrometer
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•        250 micro-inch – forging surface
; D; [( G) Z( @% j' j: P1 u" e$ S•        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”
! ~2 T# {) c  p' c+ `& R•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
" B, S1 I3 R# h: Q' `•        One of OD or ID is close standard size
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