AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
/ s2 L0 p- e6 x1 p, chttp://www.newmaple.com/forumdisplay.php?fid=28

' O9 v( z+ s) Q( g" x* x3 cwww.newmaple.com/video/autocad0006
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1. Title block brief introduction

2. Text height
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3. Viewport
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4 _3 S9 T) J+ K. \, }  f/ g) O4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

0 Q: _1 Q9 R. a+ M0 Y1 d3 sspecial symbols
% n2 v( `( j+ o% i( ?5 K%%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
1 m9 B7 v3 v7 ^* r$ i0 X5 ^AutoCAD 实战讲座第七讲
! {3 x+ U/ D0 r, g$ WNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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A real sample to review lecture 6

Introduction Roughness
2 Q' `2 m# ]/ E0 B3 E; g6 x& l& sQuick check hole size and position
' b3 F6 j, s+ E8 H0 c& bIntroduction O-ring groove
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Surface roughness
# J4 K3 ?1 ?( z+ {0 \! l•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
5 D+ Z; J' Y8 G+ \; g6 s( ?# x4 K1 h•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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9 w) D' C% H4 G/ EInch size O-ring
5 e7 K0 R2 I3 a; Q•        O-ring number 232
. j" A. m, Q. W•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
- Y9 c/ S5 a7 P" e1 @1 |6 }+ R•        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