AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://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

+ w5 }8 m; B. O' S2. Text height
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3. Viewport
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4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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special symbols
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%%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
AutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
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3 }7 u$ C/ q% l4 N/ IA real sample to review lecture 6
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# T: F* I3 d8 bIntroduction Roughness
3 D+ ~1 d2 S. PQuick check hole size and position
4 X* m  F; H4 j, jIntroduction O-ring groove
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Surface roughness
  \. _# ~- z+ S•        Imperial Unit: micro-inch 10-6 inch
# `1 Q' d' o: ~4 s, c1 E•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
4 e) c! ^0 V& l1 l: k/ R, r•        250 micro-inch – forging surface
4 Q3 j6 {* H7 O) }•        125 rough machine, 32 fine machine

Inch size O-ring
2 k2 G3 R1 M& m* r5 M) B* y5 O  ^1 G•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
- F) ]3 J$ `; g•        Actual size 2.734”x3.012”x0.139”
$ U* Z& @" e/ ~•        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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4 p( O) J  A4 q9 o/ B, Mhttp://www.newmaple.com/forumdisplay.php?fid=28