AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
! Q* i; n+ r- u8 E0 E" V6 b) ^http://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006

6 G$ e0 T( z# L! h' O1. Title block brief introduction

+ |, \. q' \  |2. Text height
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6 X5 E5 y& Q# P! x5 j( k( n! D3. Viewport
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4. Dimensions style brief introduction
: ?3 o; S2 ^, b9 j•        Tolerance in Mechanical / Autocad

special symbols
4 E" ~5 G9 F; q* J7 ^2 v7 w7 G& ^%%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
AutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

3 n3 J9 g2 b3 `9 R) t% {A real sample to review lecture 6

9 q1 u, q7 g  C6 K( DIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove

$ C/ p7 E1 m! |) Y2 W$ k0 \; aSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
1 B' @: ]( X: W% P•        Metric Unit: micrometer 10-6 m
/ Y+ X4 G1 ^! t+ P/ N•        Sample 250 micro-inch = 6.3 micrometer
  `8 c5 }$ |, s  b* |(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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7 H2 l6 o* k& Y! eInch size O-ring
/ C0 g1 b- I) v8 M5 m7 Q/ f6 ]* C•        O-ring number 232
% ?# j6 a1 A" j0 S•        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
% H! J8 ?5 e* W, C•        One of OD or ID is close standard size
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