AutoCAD 实战讲座

DaShan

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

www.newmaple.com/video/autocad0006

1. Title block brief introduction
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& G* j3 p# L0 Q4 [/ f  |2. Text height
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3. Viewport

' x8 g' Y, @/ I! T9 s4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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5 ?8 f9 r! @: O. w; J2 C5 q+ Sspecial symbols
%%D degree sign
%%P plus and minus sign
: V' a0 ^$ a1 U%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
' e2 K' v4 e! hAutoCAD 实战讲座第七讲
7 w- a% n( k7 U" {8 A4 K, b5 N' ~2 GNew Maple AutoCAD (7)
  a4 W8 a9 R* S1 Kwww.newmaple.com/video/autocad0007
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A real sample to review lecture 6

# d, Y1 J$ {) c' [Introduction Roughness
6 M( \6 ]# h7 r6 S, ?$ N; zQuick check hole size and position
Introduction O-ring groove

6 F. x9 ~1 I+ a' BSurface roughness
# j! L2 ~7 F: \+ I. _* }•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
; v9 q4 z/ H1 ~# O( \4 r/ v(250X25.4X10-3)
•        250 micro-inch – forging surface
+ }0 q9 s% t  y•        125 rough machine, 32 fine machine
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, W( F7 L3 n% V- {! dInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
& [9 u1 B) r' H# B•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

http://www.newmaple.com/forumdisplay.php?fid=28