AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
$ |( ^6 @$ z) V
www.newmaple.com/video/autocad0006
- C& ^3 u3 \7 p9 @
1. Title block brief introduction

2. Text height
; T+ ?$ E) T! {6 A
2 s4 E$ r" F# G! [& c/ G3 @3. Viewport

7 r! }; d$ L( h$ p' s4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

: [* J- J& S2 uspecial symbols
%%D degree sign
%%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
5 o. C7 n9 J( x: y0 ?  P: dNew Maple AutoCAD (7)
& \5 {  h. e) Owww.newmaple.com/video/autocad0007
+ V% M# y3 X$ o# X- G
A real sample to review lecture 6
8 x; {2 P7 }' a8 J; h
Introduction Roughness
Quick check hole size and position
/ ]3 b3 v7 R: m3 @$ W8 QIntroduction O-ring groove
* E! r* w" b+ `* ]: Z, B& }
Surface roughness
) A9 ^# ?9 c  D1 ~9 t6 o$ I•        Imperial Unit: micro-inch 10-6 inch
$ U* l5 E, E8 _$ c& _- D- h•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
3 C3 Y7 B1 D. {: |(250X25.4X10-3)
! J: A+ W  p  K' o! r6 _•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
- Y( A# U0 j+ _( H4 H, M9 b; d: }+ J
Inch size O-ring
+ p0 X4 [. C  ?! C3 W•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
7 ~$ ~# h& K' v. f+ X•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
* T4 I3 ^. z% f! i* H& D3 B8 Y, U•        One of OD or ID is close standard size
/ B3 b% {! B- |+ J
4 c6 @# r! w% Q4 L) Y. Ihttp://www.newmaple.com/forumdisplay.php?fid=28