AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
( A( H  E5 ]+ t% ?$ n) Chttp://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006
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1. Title block brief introduction
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2. Text height
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3. Viewport
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7 k  _$ y6 C9 D" ?( p4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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special symbols
%%D degree sign
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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)
www.newmaple.com/video/autocad0007

# y+ a! P9 k& S1 x+ `! }A real sample to review lecture 6

Introduction Roughness
" _3 r1 J$ N1 I8 \* _" jQuick check hole size and position
* _9 F* G9 J( B8 g+ V; XIntroduction O-ring groove
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Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
# n2 v2 W. M9 f; @•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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1 v# C4 ^5 ]$ h, C- _Inch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
$ C- V- f1 P3 U1 S) s5 K/ {•        Actual size 2.734”x3.012”x0.139”
: j. }0 Z1 ^; q% _2 o•        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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* s+ w1 t* m' w& G" p) q6 w2 l+ [2 @http://www.newmaple.com/forumdisplay.php?fid=28