AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
. Z. c- t' ^+ I$ r7 v# _http://www.newmaple.com/forumdisplay.php?fid=28
5 T. Y, n, B( s2 J7 d
www.newmaple.com/video/autocad0006
/ Z- n( r8 J. B9 F3 K" F, Z
, e$ ~1 y; @7 I( e; U  `1. Title block brief introduction
. D& H) }& J. W5 l
2. Text height

1 u! s( V8 o! h. t( X! t% o3. Viewport
/ B" L$ B/ k2 v
3 P% u5 a- N" i- \4. Dimensions style brief introduction
$ w% t4 w( D$ C$ U3 U$ w! {) ~4 O" z•        Tolerance in Mechanical / Autocad

special symbols
( z5 [$ u# @8 r%%D degree sign
%%P plus and minus sign
& ^+ R) d( j- t%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
; n# l& p/ @- O: F; H4 pAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
1 N5 d) H: w$ c( i5 R5 _$ e
A real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
Introduction O-ring groove
# `# ~4 J. A# n) `
Surface roughness
/ }! z) m- b1 z- k- O5 ~•        Imperial Unit: micro-inch 10-6 inch
; ?/ i( j5 N% n0 Q  Z3 k" i•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
/ v# p5 i- U, L  J4 s* u, ~(250X25.4X10-3)
+ R2 Y0 N+ A$ L( x•        250 micro-inch – forging surface
& r1 ^* p/ ~* J7 n•        125 rough machine, 32 fine machine

Inch size O-ring
•        O-ring number 232
( b. l% Z- t8 Z; j. ~7 c•        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
# u  N; D! ]* G1 p: D•        One of OD or ID is close standard size
( W. `& E! F/ t
http://www.newmaple.com/forumdisplay.php?fid=28