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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1. Title block brief introduction

2. Text height

3. Viewport
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4. Dimensions style brief introduction
6 v- a. o, W: o& }/ v" m•        Tolerance in Mechanical / Autocad
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- I# ^  ?7 [" j( b6 T1 V: P/ especial symbols
+ h- H& z. ^5 _( C& {* G& m%%D degree sign
% l+ a7 w$ p! R: X( m; ?8 P%%P plus and minus sign
; L" `1 X+ v5 v9 s; X%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
' d5 o; U+ m% _% E, QAutoCAD 实战讲座第七讲
1 H0 ]; Z- m5 |New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

A real sample to review lecture 6

( o  U9 {  w3 f2 l: V7 oIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove

Surface roughness
( ?& ~/ o# y$ V: @( ~! w1 a•        Imperial Unit: micro-inch 10-6 inch
0 A) {6 t. b+ p1 K5 `•        Metric Unit: micrometer 10-6 m
5 Z# b+ h6 B; s$ s  h0 Q% Z•        Sample 250 micro-inch = 6.3 micrometer
& {: M! ~, a! B2 S% v(250X25.4X10-3)
) L4 P: c' y# t+ {•        250 micro-inch – forging surface
* C! i. P+ g0 W1 c5 A" A4 Y•        125 rough machine, 32 fine machine

Inch size O-ring
2 ^, L4 s6 d: ^. t; p% q8 L•        O-ring number 232
; L, K" q. D8 ~  J+ C7 W•        nominal size 2.75”x3”x1/8”
* ~( ?- i9 d8 L1 i) X  G; F* D•        Actual size 2.734”x3.012”x0.139”
/ `! b7 J. m8 Z" L! c•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
$ V5 k0 _4 \. k2 j* O•        One of OD or ID is close standard size
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http://www.newmaple.com/forumdisplay.php?fid=28