AutoCAD 实战讲座

DaShan

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

www.newmaple.com/video/autocad0006
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4 P' V4 ~* r3 z& A2 C1. Title block brief introduction
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2. Text height
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3. Viewport
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% A# }  I1 N5 A5 m4. Dimensions style brief introduction
! T' N0 e% _- z5 l9 _5 d7 |•        Tolerance in Mechanical / Autocad
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special symbols
%%D degree sign
2 I% e. m/ [* U9 K%%P plus and minus sign
0 D$ H9 F% N7 |6 P2 s& [%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
; j4 K8 @( \6 m; D1 W3 f( ?  K" FAutoCAD 实战讲座第七讲
* Z  M$ }7 C2 y0 V, |8 P4 ANew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

A real sample to review lecture 6

& ^# \- q+ {4 p- W$ {" h& uIntroduction Roughness
8 s, j+ N# A' \# P7 ^Quick check hole size and position
$ D% m) a" {& e+ Z; y) hIntroduction O-ring groove

* r1 U0 ~2 q) ?; Z" p. u, TSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
•        O-ring number 232
0 F# e0 x* Q* a1 h1 W0 I6 N& p•        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

http://www.newmaple.com/forumdisplay.php?fid=28