AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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4 |/ k( o( c  P" R# m( o) zwww.newmaple.com/video/autocad0006
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1. Title block brief introduction

: [5 X, W, }7 Y3 c2. Text height

3. Viewport
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# ~2 N1 b# g. o2 _9 ^( H9 U6 {4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

special symbols
%%D degree sign
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9 ^% m* V( Q3 A' {! Y0 i%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
AutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
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A real sample to review lecture 6

Introduction Roughness
7 x) R" k7 }$ K' E9 c7 v4 Y* GQuick check hole size and position
Introduction O-ring groove

$ G& _9 R: ]! CSurface roughness
/ [5 H+ s1 e& F' H•        Imperial Unit: micro-inch 10-6 inch
8 S0 K. s! n& I7 ]( m•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
: U7 a( |4 }8 U; A1 v(250X25.4X10-3)
  f5 s- V6 ~" Z3 L6 ]; n' e- w0 }0 N•        250 micro-inch – forging surface
0 |3 B( k+ b' g3 u5 R; I! I6 _•        125 rough machine, 32 fine machine
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Inch size O-ring
2 W- I  U& u, L•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
; M- h, m3 o2 r3 H( K•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
1 D; d$ N5 W/ [. j& h4 R& {•        One of OD or ID is close standard size

) l! W. {) B- A. P2 n9 j4 Phttp://www.newmaple.com/forumdisplay.php?fid=28