AutoCAD 实战讲座

DaShan

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

' i* c2 l3 g; U# ^6 \* h' I' Ewww.newmaple.com/video/autocad0006
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1. Title block brief introduction
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2. Text height
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' C8 j" Z' T0 ?5 K9 ]9 V3 |3. Viewport
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4. Dimensions style brief introduction
9 v: `& ]) y( W) J7 X•        Tolerance in Mechanical / Autocad

special symbols
%%D degree sign
%%P plus and minus sign
" \' V  J9 M# k& \%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
. w/ S2 w# v: c. I2 DAutoCAD 实战讲座第七讲
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5 i" ]# U; Z0 c; x1 P5 dwww.newmaple.com/video/autocad0007
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  I" z9 \/ @% g/ pA real sample to review lecture 6
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! R# u* O! W9 V) c# SIntroduction Roughness
* U5 U: C9 q/ E7 rQuick check hole size and position
7 M  r: b# z' ZIntroduction O-ring groove
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Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
, D/ J5 n+ M+ ]/ q•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
8 }* j( _9 c; a" e8 z- e; \•        125 rough machine, 32 fine machine
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1 L( p8 y/ ?: K: X, \Inch size O-ring
•        O-ring number 232
3 S2 @1 F# S: i( ?6 C" J( i•        nominal size 2.75”x3”x1/8”
5 `; I7 v, M" l/ ]( g6 M) D•        Actual size 2.734”x3.012”x0.139”
0 x8 o& T: o+ w; i•        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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http://www.newmaple.com/forumdisplay.php?fid=28