AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
2 N/ E$ m! y% ^6 y3 `7 chttp://www.newmaple.com/forumdisplay.php?fid=28

6 Q- H, W4 m* R2 F7 Y! fwww.newmaple.com/video/autocad0006
6 e( [3 X+ n4 j  c3 s9 `! I  C7 p1 |
1. Title block brief introduction

2. Text height
) v2 S" ^# I( ]5 ^7 B) P- ^
! G9 u) o3 X5 x3. Viewport
0 U, [0 U% J6 M6 S+ N- Z; E6 q
( ]$ S6 |+ I# S4. Dimensions style brief introduction
- s% T, \8 H. Q" f% G& X•        Tolerance in Mechanical / Autocad

special symbols
%%D degree sign
6 |( L% _$ N3 M4 G; a%%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
4 {3 L0 q& H. U9 eAutoCAD 实战讲座第七讲
" J% w5 M0 R" w) d! {2 v0 @; cNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

4 Y1 k$ C9 j  |" W- a1 y# WA real sample to review lecture 6

9 V* P! B- H) S  c$ m# H, ^Introduction Roughness
Quick check hole size and position
Introduction O-ring groove
) A. M! |% B' {, S. O
- K2 I- F' a' u% t5 _7 }Surface roughness
) _5 e6 q8 z% w•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
" q& c' u1 p5 R, a(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
•        O-ring number 232
2 a1 J4 v5 A) z& f" f, O6 V3 d•        nominal size 2.75”x3”x1/8”
1 L; l1 J5 _. L" n) R•        Actual size 2.734”x3.012”x0.139”
; J# Z$ j" w. @; u% O5 c4 |•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size
; Q' n) ?& R1 w  y8 y, e0 Y% M
http://www.newmaple.com/forumdisplay.php?fid=28