AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006

- B9 {3 n2 l& f& @( ~" y8 t1. Title block brief introduction
0 x# D/ |- S! j, R& j' C
2. Text height

2 H! e) L7 `4 o! ?# K  P" m3. Viewport
. A& \2 z& F- w+ t
; Y* R, V: ~9 s" k" y9 U4. Dimensions style brief introduction
4 N8 d6 B1 c- ]2 F7 d- E* P! t•        Tolerance in Mechanical / Autocad

6 h; v6 {1 i  ]" T+ j* T% k( ~/ Dspecial symbols
%%D degree sign
%%P plus and minus sign
  d6 J! ^  q* h$ v( ]' K* b%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
1 A+ `* K7 ^3 AAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
, M+ w6 v+ H# S2 a# A* ~, @! Iwww.newmaple.com/video/autocad0007
1 A0 [% K( f; K6 M7 Y
2 e7 W& I. D- I7 R! g2 ?3 ]' KA real sample to review lecture 6

8 G# l% ?) x3 x, cIntroduction Roughness
Quick check hole size and position
* p$ o, D- h+ B( Y/ d* m* _Introduction O-ring groove

Surface roughness
* i; t7 V6 N8 p: h3 U- ?•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
$ Z! }+ T' }8 T7 e. ~•        Sample 250 micro-inch = 6.3 micrometer
! P6 F' J" ]3 p3 ?) ]& w0 F( H8 X(250X25.4X10-3)
•        250 micro-inch – forging surface
6 Q# `: Q4 F6 G! Z% n7 w•        125 rough machine, 32 fine machine

Inch size O-ring
•        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
5 s8 b$ @1 }3 y- l. S
. v: e) W# G# C' I0 [4 k1 P8 _0 ohttp://www.newmaple.com/forumdisplay.php?fid=28