AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
+ e0 B$ n  {7 S( x/ U3 Q5 Ehttp://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006
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1. Title block brief introduction

4 G5 s) j7 P9 g5 V3 G/ E2 ^2. Text height
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3. Viewport

. _$ y% A9 g6 D+ G8 \8 Q4. Dimensions style brief introduction
! m$ ]6 w( ^3 s3 P, i9 \•        Tolerance in Mechanical / Autocad

special symbols
  L/ x" T& S; U( h+ H%%D degree sign
%%P plus and minus sign
. P" z: q: Y7 G* S%%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)
www.newmaple.com/video/autocad0007

$ z5 j! o# Q! E2 C6 \7 DA real sample to review lecture 6
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( {( ^: |; k" t0 [6 Z6 Z0 P' }Introduction Roughness
1 V. s- _" k# A2 h0 }Quick check hole size and position
8 o3 G2 f% i  JIntroduction O-ring groove
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Surface roughness
1 o- R0 m2 _% P& l) B( r" Z  L•        Imperial Unit: micro-inch 10-6 inch
0 G' `& r6 S5 R6 q: Z2 ]•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
  H5 B- ~3 U! w: n( \7 N% Y- R8 [; _•        250 micro-inch – forging surface
, z5 z, L! t  g/ r! s) Z# J  E•        125 rough machine, 32 fine machine

Inch size O-ring
•        O-ring number 232
' A4 B. K/ [+ M! J0 u+ f•        nominal size 2.75”x3”x1/8”
! E+ y' d# t. S' e  ~•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
) D1 \" W) C5 A8 A6 ~! t, ~•        One of OD or ID is close standard size
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http://www.newmaple.com/forumdisplay.php?fid=28