AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
  r0 [5 l3 d3 \$ N& z8 {
  k% f# ^, Q7 ?+ P* I- @0 Mwww.newmaple.com/video/autocad0006

1. Title block brief introduction
9 }3 V% k/ x+ Y: @8 z  N
9 `! x! Y3 y3 k8 E$ S( Z( Z( N  |2. Text height

3. Viewport

4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

special symbols
%%D degree sign
5 [7 K' S% u; P8 x%%P plus and minus sign
1 ?' R' z! F8 w* O5 l4 f( {& Z4 a5 h%%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
7 e! Z$ x& f3 j& m7 k- rNew Maple AutoCAD (7)
9 K& u  C# J5 k* j  g+ Q5 ^. O8 ^www.newmaple.com/video/autocad0007

A real sample to review lecture 6
; E1 y' j  O. w* L: o% y# w
* o' o, M2 o" y9 uIntroduction Roughness
8 B) ^8 _4 Q* {" ^' @& p/ j2 {Quick check hole size and position
+ J% E* g' A! SIntroduction O-ring groove

Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
( r7 W5 S" _; f•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
7 F+ u# G- r& s, a(250X25.4X10-3)
•        250 micro-inch – forging surface
2 t3 [! [% J9 [/ e* R. G•        125 rough machine, 32 fine machine
  X& L" i6 d9 e0 }. K/ R" S1 x- K
% w% h8 }4 `+ w; eInch size O-ring
" F. m# |1 `9 D$ I•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
& ]! Y0 ^7 ^/ x6 c) Y6 {•        Actual size 2.734”x3.012”x0.139”
  x9 e7 U6 ^! ~/ ?•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

7 j' G; R% j# H% ?http://www.newmaple.com/forumdisplay.php?fid=28