AutoCAD 实战讲座

DaShan

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

4 _  Q. s! |/ J( t- v6 T0 }$ h* J0 O* b% fwww.newmaple.com/video/autocad0006
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1. Title block brief introduction
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2. Text height

3. Viewport

4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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special symbols
%%D degree sign
2 m1 r2 [+ F' I8 }; l( [, o4 \. c%%P plus and minus sign
/ o- j+ o0 l; T5 g! c2 K) L! M%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
  E* y. `" c3 f6 f; kAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
) m0 ]( u+ y- U4 K! S: j  awww.newmaple.com/video/autocad0007
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A real sample to review lecture 6

6 e8 m* [) m; m7 [; j$ H2 yIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove
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% U9 Q* z2 {4 u9 s( A# zSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
) u4 U$ l6 M( i+ F•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
' `/ u2 r! l1 U. _4 ?5 O1 X" W•        125 rough machine, 32 fine machine
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* D1 C$ l! {( L* M! g& cInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
/ F- K( Z# b3 I7 }: L4 `6 ^8 N•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
* A3 y; f5 K: k( D" P# O, A•        One of OD or ID is close standard size
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http://www.newmaple.com/forumdisplay.php?fid=28