AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
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# a7 E% {3 G1 ]% u4 l+ F/ o1 G+ Wwww.newmaple.com/video/autocad0006
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1. Title block brief introduction
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" Q+ w3 i( _  _4 j0 @2. Text height

+ T$ C) O9 ~8 Y. \* m3. Viewport

4. Dimensions style brief introduction
& j) {$ j" X$ K7 A$ ?3 X•        Tolerance in Mechanical / Autocad
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special symbols
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+ G) m. R& i/ V: Q. e%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
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www.newmaple.com/video/autocad0007

A real sample to review lecture 6
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Introduction Roughness
% \2 ^. g3 ^& B( c, |Quick check hole size and position
Introduction O-ring groove

Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
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, Y5 n- k7 w+ b5 H- r•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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3 v( K3 d- Z+ w- l+ k  \Inch size O-ring
& R5 V" y* V& n3 _3 A6 S•        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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