AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
! b* m0 \$ X, p) c4 ~
www.newmaple.com/video/autocad0006
# W, H; Q  V  p; Z5 p) `
1. Title block brief introduction
! g6 f+ o. e/ s/ }3 c& d7 s$ F0 o
5 ^) Y! M$ |4 E/ v3 ?4 R2. Text height

- s3 J4 |" v% f: `9 X' P1 p; p# T3. Viewport

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

special symbols
6 {9 F8 `/ c" o" n! E% _. D%%D degree sign
%%P plus and minus sign
) Y8 k' e) Q& R4 c& M%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
7 V. ]( h* X5 J& M/ p# |6 s9 \' C' vAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
3 w+ A: @) Z, pwww.newmaple.com/video/autocad0007

A real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
Introduction O-ring groove
) {7 S& ?! H8 J( L. ?) Y
' ]1 l1 y' i7 {2 V  P3 S" ^Surface roughness
6 q' f- L. m/ J8 y•        Imperial Unit: micro-inch 10-6 inch
, ?+ q  {( x/ S6 H, P2 j•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
0 n  N5 a+ x! z(250X25.4X10-3)
. t# J3 g) I5 H7 W3 u/ R/ v! h" q•        250 micro-inch – forging surface
; V- w1 J* ?6 A# e7 E3 ~3 w•        125 rough machine, 32 fine machine
/ H8 `: X% ?( x) f$ r3 z
1 ]8 m% K* d, \2 tInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
& Y# e0 w  V: u3 w•        Actual size 2.734”x3.012”x0.139”
7 r% @- S6 s1 }' d) J2 {* Q4 C•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
" _+ ~- D- p  A- Q5 L$ ]5 u•        One of OD or ID is close standard size
; C% a1 {# b. p1 V
# p, e9 \- D5 Z# P1 Ohttp://www.newmaple.com/forumdisplay.php?fid=28