AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
0 V* P+ i. k9 T$ [7 h& R( Uhttp://www.newmaple.com/forumdisplay.php?fid=28

' g& I1 P, K2 dwww.newmaple.com/video/autocad0006
2 O( ~" Z: Y. ?
1. Title block brief introduction

! V1 G5 `3 U" _2 ~2 `5 }2. Text height

7 y! g/ d' v- w, t/ d8 r3. Viewport
8 d' F: }, J% }/ Y
4. Dimensions style brief introduction
( m& J+ y* e# Q6 }* Y2 K•        Tolerance in Mechanical / Autocad
4 W+ N6 R/ W( f  B# n
+ x! y# [; m6 p# @+ Wspecial symbols
%%D degree sign
%%P plus and minus sign
" J  P7 K& A; ]' _0 q" p" A%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
! ~8 L8 `3 {# f+ F. \1 x; I' ~AutoCAD 实战讲座第七讲
& j  m5 a. P+ y% y* sNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
2 [5 p2 l1 v. w7 s
A real sample to review lecture 6
  k4 ?4 y6 a4 N+ f! \, J
" j& }2 ?$ w8 J$ {Introduction Roughness
Quick check hole size and position
' |. i2 Z( d( E1 Z1 e" B1 yIntroduction O-ring groove

Surface roughness
# U. n$ a' w% [* `+ g* F•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
. G% @; N* m' C* D/ ?(250X25.4X10-3)
•        250 micro-inch – forging surface
3 r& p$ J( J4 T8 Y•        125 rough machine, 32 fine machine
. e2 C8 N3 B) ~- m2 E. E, h/ q
1 `% {* O0 T3 b, J7 CInch size O-ring
9 T. e" b+ ~5 O* i•        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
& d- x- v; {5 M% x
http://www.newmaple.com/forumdisplay.php?fid=28