AutoCAD 实战讲座

DaShan

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

www.newmaple.com/video/autocad0006

* a2 w" Z8 ]  u) c4 e$ t9 B" B& n1. Title block brief introduction

2. Text height
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. e0 h% H& V; H6 m: \  j3. Viewport

4. Dimensions style brief introduction
; R( \2 {2 z6 e# F- ~( f, A" Y; O•        Tolerance in Mechanical / Autocad

7 ?& T8 r6 y6 L% N) B/ @- P; lspecial symbols
%%D degree sign
%%P plus and minus sign
%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
/ m. k9 ?8 [. fAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

( O* c' b' z8 }( KA real sample to review lecture 6
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7 {- a* T$ G: TIntroduction Roughness
Quick check hole size and position
# A$ t  a! S+ @/ e  E, l1 rIntroduction O-ring groove
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- w' V/ [: K- k6 JSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
+ d/ ~1 E3 n* W•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
! E4 G2 X, j7 m" `( p. j•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

* v+ C( q8 A6 r! E; mInch size O-ring
•        O-ring number 232
& B+ Y$ c% x( h+ J: u$ l•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
) s; u( y  C4 z0 |" y: w! W/ G•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
" g: s0 P# P/ A! Q0 e8 r7 o4 g# }3 k•        One of OD or ID is close standard size

0 V2 \# x9 \1 ?8 X( Uhttp://www.newmaple.com/forumdisplay.php?fid=28