AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
, H2 [! P* J2 nhttp://www.newmaple.com/forumdisplay.php?fid=28

# a/ h4 ^. h: q3 C  h4 K! T3 @www.newmaple.com/video/autocad0006

1. Title block brief introduction

2. Text height

3. Viewport
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5 M! I1 B! n# v2 l6 R5 p+ a3 \0 @4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

special symbols
' [* M8 z1 T/ T) o- i+ @, y1 ^%%D degree sign
%%P plus and minus sign
2 X) y) e& w8 j  q* H+ `%%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

3 L1 H) u+ n8 QA real sample to review lecture 6
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Introduction Roughness
0 ^/ v3 Q! X. Y* C! uQuick check hole size and position
7 @$ t# X- I7 J& D0 I& yIntroduction O-ring groove

: ]& B* S3 D3 M: o/ R/ GSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
" C* c' s* ^! M3 H, Z+ L4 C$ a•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
" K  n- X, _! }•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
•        O-ring number 232
- i, M6 S- ]* P( l, x, b7 W$ S•        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
* w; h% v/ w, O1 l) f/ d•        One of OD or ID is close standard size
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http://www.newmaple.com/forumdisplay.php?fid=28