AutoCAD 实战讲座

DaShan

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

www.newmaple.com/video/autocad0006

1. Title block brief introduction
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" _4 `2 x6 J) \, i- i. Z2. Text height
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* n/ [2 s, ~: ]3. Viewport

4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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special symbols
9 ^' A0 i5 [1 C6 z% s%%D degree sign
! [' }; Z# v8 u  \. |%%P plus and minus sign
%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
9 f+ w- y# b$ L- {9 e7 G' |AutoCAD 实战讲座第七讲
0 }$ F) l+ B7 T  h) @New Maple AutoCAD (7)
) _1 |, V, c/ owww.newmaple.com/video/autocad0007
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A real sample to review lecture 6

) ^; v; ?  _- }; i  oIntroduction Roughness
$ g( q7 c# }$ R+ T: PQuick check hole size and position
% q6 X  k' h6 j4 _( E8 tIntroduction O-ring groove
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Surface roughness
6 Z$ Y  i1 u  S8 C•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
6 h1 d- |' g& u' F, N•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
' f8 B1 B+ M3 x0 b! n•        125 rough machine, 32 fine machine

6 t, h0 |( P0 S& {, p9 `6 FInch size O-ring
•        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
•        One of OD or ID is close standard size
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1 [  C- K! ]: Ghttp://www.newmaple.com/forumdisplay.php?fid=28